dl3282 technical manual
TRANSCRIPT
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S e r v i c e M a n u a l
DL-32821200 Baud Modem
Part Number : 250-3282-002
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DL-3282 1200 Baud Modem
Revision 001001-3282-101/102 May 1999Supersedes 001-3282-003 March 1999
Copyright 1999 by Dataradio COR Ltd.
Dataradio COR Ltd. designs and manufactures radios and radio modems to serve a wide variety of data communication needs. Dataradio produces equipment for the fixed data market including SCADA systems for utilities, petrochemical, waste and fresh water management markets and RF boards for OEM applications in the Radio Frequency Data Capture market.
PRODUCT WARRANTY
The manufacturer's warranty statement for this product is available from Dataradio COR, Ltd. 299 Johnson Avenue, Box 1733, Waseca, MN 56093-0833. Phone (507) 833-8819.
The information in this document is subject to change without notice.
is a trademark of DATARADIO, Inc.
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iPart No. 001-3282-101/102
TABLE OF CONTENTS
1 GENERAL INFORMATION
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11.2 MODEM DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11.3 FACTORY TECHNICAL SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11.4 PRODUCT WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21.5 REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21.6 FACTORY REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
DL-3282 1200 BAUD MODEM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 MODEM ADJUSTMENTS AND SETUP
2.1 INTERCONNECT CABLE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1USER INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23282 LEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2 FACTORY DEFAULT SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3RECEIVE INPUT LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3 ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3DIP SWITCH S101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6TRANSMIT OUTPUT LEVEL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
3 THEORY OF OPERATION
3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13.2 FULL-DUPLEX/HALF DUPLEX OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23.3 DATA TONE BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3PHONE LINE AND RF LINK BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.4 GENERAL AND LOOPBACK MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3GENERAL MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3LOOPBACK MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.5 TRANSMITTING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4DTR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4RTS SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4DELAY PERIOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5DATA FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5COMPLETING DATA TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.6 RECEIVING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6DTR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6CARRIER DETECT (CD) SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6COMPLETING DATA RECEPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
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TABLE OF CONTENTS
iiPart No. 001-3282-101/102
4 PARTS LIST
5 COMPONENT LAYOUT
6 SCHEMATIC
LIST OF TABLES
2-1 3282 INTERCONNECT CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12-2 SWITCH S101 SETTINGS FOR BELL103/202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-42-3 DIP SWITCH S101 SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-42-4 SWITCH S101 NORMAL CONVENTIONAL MODE OPTION SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-52-5 SWITCH S101 TEST MODE SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
3-1 MODEM TIMING PARAMETERS (BELL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
LIST OF FIGURES
2-1 DL-3400 EXTERNAL CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12-2 RNet / JSLM EXTERNAL CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22-3 RS-232 CONNECTOR PINOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22-4 DIP SWITCH S101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-62-5 MODEM BOARD ADUSTMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
3-1 MODEM BOARD BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13-2 MODEM TONE FREQUENCY BANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23-3 MODEM INTERCONNECT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7
5-1 3282 MODEM COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
6-1 3282 MODEM SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
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SECTION 1
1-1
001-3282-101/102
GENERAL INFORMATION
1.1 INTRODUCTION
This manual contains setup and service information for the RS-232 Dataradio COR Ltd. Modem. This modem can be purchased separately or as part of a telemetry module as described in the next section. Since the telemetry module service manuals do not include modem servicing information, this service manual is used in all applications.
1.2 MODEM DESCRIPTION
This modem can be purchased separately using Part No. 250-3282-002, or as part of a DRL DL-3400 or DRL JSLM/RNet Telemetry Module using Part No. 023-3282-002.
The function of a modem is to convert digital data into an analog signal that can be used to modulate an RF carrier. It also converts these analog signals back into digital data. This allows digital data to be transmitted and received using an RF link.
This modem is compatible with Bell 103/202 standards for modems. It has an RS-232 compatible port for interfacing with data equipment. An RF transmitter, receiver, or transceiver is required with this modem unless it is used with some other type of link such as a phone line. Refer to Section 3 for a complete description of modem operation.
1.3 FACTORY TECHNICAL SERVICE
The Technical Service Department provides customer assistance on technical problems and serves as an interface with factory repair facilities. They can be reached in the following ways:
Dataradio COR Ltd. 299 Johnson Avenue, P.O. Box 1733
Waseca, MN 56093-0833
Technical Service hours are: Monday to Friday 7:30 AM to 4:30 PM, Central Time
Phone: 1-800-992-7774
or 1-507-833-8819
Fax:1-507-833-6748
Email address: [email protected]
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GENERAL INFORMATION
1-2
001-3282-101/102
1.4 PRODUCT WARRANTY
The warranty statement for the Integra-TR is available by contacting your sales representative or by sending your request to Dataradio COR Ltd. (see Section 1.3 for address).
1.5 REPLACEMENT PARTS
This product is normally not field-serviceable, except by the replacement of complete units. Specialized equipment and training is required to repair logic boards and radio modems.
1.6 FACTORY REPAIR
Dataradio products are designed for long life and failure-free operation. If a problem arises, factory service is available. Contact the Technical Service Department before returning equipment. A service representative may suggest a solution eliminating the need to return equipment.
A Return Material Authorization (RMA) is required when returning equipment to Dataradio for repair. Contact the Technical Service Department at 800-992-7774, extension 6707 to request an RMA number. Be prepared to give the equipment model and serial number, your account number (if known), and billing and shipping addresses.
Include the RMA number, a complete description of the problem, and the name and phone number of a contact person with the returned units. This information is important. The technician may have questions that need to be answered to identify the problem and repair the equipment. The RMA number helps locate your equipment in the repair lab if there is a need to contact Dataradio concerning the equipment. Units sent in for repair will be returned to the customer re-tuned to the current Dataradio Test and Tune Procedure and will conform to all specifications noted in this section
Customers are responsible for shipping charges (to Dataradio) for returned units in warranty. Units in warranty are repaired free of charge unless there is evidence of abuse or damage beyond the terms of the warranty. Dataradio covers return shipping costs for equipment repaired while under warranty.
Units out of warranty are subject to repair service charges. Customers are responsible for shipping charges (to and from Dataradio) on units out of warranty. Return shipping instructions are the responsibility of the customer.
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GENERAL INFORMATION
1-3
001-3282-101/102
DL-3282 1200 BAUD MODEM SPECIFICATIONS
The following are general specifications intended for use in testing and servicing this modem. These specifications are subject to change without notice.
FCC ID Part 15Dimensions (LxWxH) 4.75 x 2.90 x 1.237 (12.07cm x 7.37cm x 3.14cm)Operating Voltage 7 to 16 VDCCurrent Drain Less than 50mATemperature Range -30C to +60CData Interface EIA RS-232C Standard: DB-25 subminiature connector, femaleDRLTM Brand Radio Interface 10-pin 3M type 3325 connectorRTS/CTS 30/60/180/240 msecData Rates FSK: 1200, 300 BPSData Format Transparent to asynchronous dataBit Error Performance Less than 1 x 10-6 at 18 dB SINAD with 3.3 kHz deviation and
25 kHz RF channel bandwidthTransmit Keyline Driver logic low open-collection NPN transistor with emitter
grounded IC (max.) = 100 mA; V CE-ON (max.) = 0.3 V
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SECTION 2
2-1
001-3282-101/102
MODEM SETUP
2.1 INTERCONNECT CABLE INSTALLATION
2.1.1 INTRODUCTION
The modem requires a power source with an operating voltage range of 7 - 16 Vdc. NOTE: Transceiver may require a more restricted operating range. Interconnect cables are available from DRL. Contact your sales representative for details.
Table 2-1 3282 INTERCONNECT CABLES
The external connector on the modem is a 3M-type male 10-pin ribbon connector. As shown in Figures 2-1 and 2-2, only one power connection is required. Also shown in Figures 2-1 and 2-2 are the pin designations for these connectors. Install these cables as required for your particular installation.
Figure 2-1 DL-3400 EXTERNAL CONNECTOR
TRANSCEIVER MODEL
DRL CABLE # CONNECTOR TYPES
DL-3400 023-3410-125 10-Pin (2)* (to spade terminals)
RNet / JSLM 697-3282-012 DE-15 (1) & DA-15 (1)*
MODEM 10-PIN CONNECTOR ASSIGNMENTS
PIN FUNCTIONTYPICALCOLOR
123456789
10
BROWNBLUEVIOLETGREENREDORANGEGRAYYELLOWBLACKWHITE
Wideband OutWideband InNOT USEDNOT USEDSUPPLY VOLTAGE (+)TX KEY (PTT) OUTCARRIER DETECT INTX NARROW BAND DATA OUTGROUND (-)RX NARROW BAND DATA IN
MODE
M
TRAN
SCEIV
ER
1
2
9
10
10-Pin Connector Pinout
Note: Using Pins 1 & 2 to transmit data is not FCC approved.PART NO. 023-3410-125
(length: 3 ft.)
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MODEM SETUP
2-2001-3282-101/102
Figure 2-2 RNet/JSLM EXTERNAL CONNECTORS
2.1.2 USER INTERFACE
The 3282 interfaces with user equipment through the DB-25 RS232 connector. See Figure 2-3 for pinout details.
RS-232 PINOUT & DESCRIPTION
1 Shield_GND J101-1
2 RS232_ DCE RXD J101-2
3 RS232_ DCE TXD J101-3
4 RS232_RTS J101-4
5 RS232_CTS J101-5
6 RS232_DSR J101-6
7 RS232_GND J101-7
8 RS232_DCD J101-8
20 RS232_DTR J101-20
Interconnect Cable (697-3282-012)
Length: 18 in (connector end to connector end)
3 ft (power supply terminals to JSLM connector end)
RNet/JSLM
Tx_Rx
Sub_Aud_Data
7 8 9 10 11 1265432 131
14 15 16 17 18 19 20 21 22 23 24 25
Figure 2-3 RS-232 CONNECTOR PINOUT
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MODEM SETUP
2-3
001-3282-101/102
2.1.3 3282 LEDS
The 3282 has 2 LEDs (CR220) that are visible through the adjustment hole in the case closest to the 10 pin connector. One LED will flash green whenever the modem has power and the microcontroller U220 is operating correctly. The other red LED will be solid red whenever the modem is transmitting.
2.2 FACTORY DEFAULT SETTINGS
2.2.1 INTRODUCTION
NormalConventionalBell 202Half DuplexActive High SquelchFSK Audio240 ms RTS to CTS Delay100 mS Soft Carrier Turnoff debounce timeTransmit Input Level (pre-set for 400 mVrms)
The factory default setting for the RTS to CTS time is set to the maximum delay for compatibility with a wide range of products. When used with DRL synthesized radios (DL-3400 and JSLM/RNet) a shorter delay time (30 ms) may be used. These settings may require adjustment in the field to optimize performance in your application.
2.2.2 RECEIVE INPUT LEVEL
For proper operation of the modem, the carrier level from the transceiver should be 35 mVrms -1 mVrms (or 99 mVp-p - 2.8 mVp-p). DRL transceivers are factory adjusted to provide a data level output to the modem of 707 mVrms (or 2 V p-p) for use with the DRL DL-3400. The data level output to the modem when used with the DRL JSLM/RNet is 212 mVrms + 17.5 mVrms (or 0.6 V p-p + 0.05 V p-p).
2.3 ADJUSTMENTS
2.3.1 INTRODUCTION
There are two adjustments on the modem board. These adjustments have been set at the factory and may require further adjustment in the field for your application.
DIP Switch S101Transmit Level R400
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MODEM SETUP
2-4001-3282-101/102
The following tables (2-2 through 2-4) show the various settings for Dip Switch S101 pictured in Figure 2-4.
Table 2-2 SWITCH S101 SETTINGS FOR BELL 103/202
DIP Switch S101Operating Mode
BaudRate
Full/HalfDup
Tx Freq Rx Freq
1 2 3 4 5 Space Mark Space Mark
(0=Off, 1=On) Normal Modes0 - 1 - 1 Bell 103 Answer 300 Full 2025 2225 1070 1270
0 - 1 - 0 Bell 103 Originate 300 Full 1070 1270 2025 2225
0 - 0 - 1 Bell 202 Full-Duplex 1200 Full 2200 1200 2200 1200
0 - 0 - 0 Bell 202 Half-Duplex 1200 Half 2200 1200 2200 1200
1 2 3 4 5 Loopback Modes1 - 1 - 1 Bell 103 Answer Loopback 300 Full 2025 2225 2025 2225
1 - 1 - 0 Bell 103 Originate Loopback 300 Full 1070 1270 1070 1270
1 - 0 - 1 Bell 202 Main Loopback 1200 Full 2200 1200 2200 1200
1 - 0 - 0 Bell 202 Main Loopback 1200 Full 2200 1200 2200 1200
Table 2-3 DIP SWITCH S101 SETTINGS
DIP Switch S101(0=Off, 1=On)
1 2 3 4 5 Function
0* - - - - Normal Mode
1 - - - - Loopback Mode (Test Mode)
- 0* - - - Conventional Mode
- - 0* - - Bell 202 Mode (Half-duplex)
- - 1 - - Bell 103 Mode
- - - 0* - Active High Squelch Detect
- - - 1 - Active Low (Inverted) Squelch Detect
- - - - 0* Bell 103 Originate Mode/Bell 202 Half-Duplex Mode
- - - - 1 Bell 103 Answer Mode/Bell 202 Full-Duplex Mode
* Factory Settings.
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MODEM SETUP
2-5
001-3282-101/102
Table 2-4 SWITCH S101 NORMAL/CONVENTIONAL MODE OPTION SETTINGS
DIP Switch S101(0=Off, 1=On)
1 2 6 7 8 Function
0* 0 0* - - FSK Mode (Audio from and to the Modem IC is not routed through the filters on board). This Mode is to be routed into an FSK/Audio Port of the Radio.
0 0 1 - - WB Mode (Audio from and to the Modem IC is routed through the audio filters on board). This Mode is to be routed into a Wide Band Port of the Radio.
0 0 - 0 0 Time between activating PTT to activating Clear-To-Send (CTS) = 30 ms.Time to debounce Soft Carrier Turnoff (SCT) at end of transmission = 25 ms.
0 0 - 1 0 Time between activating PTT to activating Clear-To-Send (CTS) = 60 ms.Time to debounce Soft Carrier Turnoff (SCT) at end of transmission = 50 ms.
0 0 - 0 1 Time between activating PTT to activating Clear-To-Send (CTS) = 180 ms.Time to debounce Soft Carrier Turnoff (SCT) at end of transmission = 75 ms.
0 0 - 1* 1* Time between activating PTT to activating Clear-To-Send (CTS) = 240 ms.Time to debounce Soft Carrier Turnoff (SCT) at end of transmission = 100 ms.
* Factory Setting
Table 2-5 SWITCH S101 TEST MODE SETTINGS
DIP Switch S101(0=Off, 1=On)
1 2 6 7 8 Function
1 - 0 - - A Simulated Un-Asserted RTS Line from the RS-232C Connector (Un-Keys the transceiver).
1 - 1 - - A Simulated Asserted RTS Line from the RS-232C Connector (Keys up the transceiver).
1 - - 0 0 Transmit Data from the RS-232 Port.
1 - - 0 1 Transmit Mark Tone.
1 - - 1 0 Transmit Alternating Mark/Space Tones.
1 - - 1 1 Transmit Space Tone.
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MODEM SETUP
2-6001-3282-101/102
Figure 2-4 DIP SWITCH S101
2.3.2 DIP SWITCH S101
DIP switch S101 has been factory set for the Normal / Conventional / Bell 202 Half-Duplex / Active High Squelch / 103 Originate Mode / FSK / CTS= 240 ms mode. The factory default setting for the RTS to CTS time is set to the maximum delay for compatibility with a wide range of products. When used with DRL synthesized radios (DL-3400 and JSLM/RNet) a shorter delay time (30 ms) may be used. Refer to the tables above and Figure 2-4 to change the delay times.
a.To access S101 and make other adjustments, remove the modem board from the housing by removing the 2 screws on the RS-232 connector, the corner screws from the opposite end of the housing, and the top cover screw. Slide the modem board out.
b.Set the switches as indicated in the Tables above (0=Off, 1=On).
c.Re-install the modem board in the housing unless performing adjustments described in the following two sections.
2.3.3 TRANSMIT OUTPUT LEVEL ADJUSTMENT
The transmit carrier level to the transceiver is factory preset for 400 mVrms. This is the input level required by a DRL transceiver connected to the modem. If this level must be reset, proceed as follows:
a.If required, remove the modem board from the housing as described in Step a of Section 2.3.2.
b.Configure the telemetry equipment connected to the RS-232 jack to transmit a continuous data signal. Alternatively, if no equipment is connected to this jack, configure S101 with switches 1 and 7 ON. Then move switch 6 to ON to key-up the modem. The modem will transmit a continuous alternating space/mark tone from U230.
S101
7 81 2 3 4 5 6 ONON
NO
RM
AL
/LO
OP
C
ON
VE
NT
ION
AL
BE
LL 2
02/1
03SQ
UEL
CH
INV
ERT
HA
LF/F
UL
L D
UPL
EX
OPT
1
OPT
2
OPT
3
0
1
-
MODEM SETUP
2-7
001-3282-101/102
c.Monitor the AC voltage at TP400, J102. Adjust R400 for 400 mVrms if using a DRL telemetry transceiver. If another transceiver is used, adjust R400 as required. J103 pin 5 has a resistor that will drop the Tx output level to 40 mVrms when connected to the DRL JSLM / RNet.
d.Re-install the modem board in the housing.
Figure 2-5 MODEM BOARD ADJUSTMENT AND TEST POINTS
Transmit Level Adjust
A Tuning tool should be used to perform adjustments on R400. This tool is availablefrom DRLs Customer Service (see Section 1.3) as part number 721-0015-142S.
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SECTION 3
3-1001-3282-101/102
THEORY OF OPERATION
Figure 3-1 MODEM BOARD BLOCK DIAGRAM
3.1 INTRODUCTION
The function of the modem is to convert digital data into tones that can be transmitted using an RF link. It also converts these tones back into digital data when the signal is received. A block diagram showing the modem, the telemetry unit generating or receiving the data, and the RF receiver and transmitter is shown in Figure 3-1.
This modem can be used for full-duplex, half-duplex, or one-way data communications (refer to Section 3.2). The RF receiver/transmitter configuration determines which type of communication is possible. This modem has an RS-232C compatible port for interfacing with the unit receiving or transmitting the data. A DIP switch on the modem PC board programs the modem to operate according to one of the Bell standards listed in Table 2-2.
U240
J101
1SHIELD
2RS-232 RxD
RS-232 TxD 3
RS-232 RTS 4
RS-232 CTS 5
6RS-232 DSR
7RS-232 GND
8RS-232 DCD
20RS-232 DTR
22RS-232 RI
U230
U220
U200
TX AUDIO
RX AUDIO
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
J102EXTERNAL
CONNECTOR
CONNECTORMOBILE RADIO
WB OUT
WB IN
FREQ SELECT
RSSI
+13.6V
PTT OUT
SQUELCH IN
TX DATA
9 GROUND
10 RX DATA
J103
SQUELCH IN
PTT OUT
GROUND
WB OUT
TX DATA
INTERCEPT
TX MUTE OUT
+13.6V
9 +13.6V
10
SUB AUDIO DATA
11 TX/RX
12 ARQ OUT
13 GROUND
14
WB IN
15 RX DATA
+13.6V
+13.6V
WB SEL
TX DATA
WB SEL
+5V+13.6V
Q250/Q251
Q252
Q253
Q254
Q255
Q256
SCI BUS
CS BUS
ADDRESS BUS
U450D U401AU400B/C/D U401CU450A
U450A U401BU450B/C
IRQ
+5V REGULATOR
RESET+5V
NORM/LOOP
H/F DUPLEX
BELL 202/103
CONV
SQUELCH INV
OPT 1
OPT 3
OPT 2
S101
-
THEORY OF OPERATION
3-2001-3282-101/102
Four integrated circuits on the modem PC board provide most of the modem functions. Microcontroller U220 provides the control functions for Modem IC U230. Modem IC U230 provides filtering and analog/digital conversion of the data. RS-232 interface IC U240 converts the -5V and +5V logic levels from the RS-232 port (J101) to the 0V and +5V TTL levels required by U230 (it also inverts these levels). Regulator IC U200 produces the +5V supply.
Figure 3-2 MODEM TONE FREQUENCY BANDS
3.2 FULL-DUPLEX/HALF DUPLEX OPERATION
Full-duplex means that data can be simultaneously transmitted and received. This type of operation allows data to be transmitted and received at the same time in a remote site. Full-duplex operation requires a duplex receiver and transmitter (transceiver) and two RF channels.
Half-duplex means that data can be both transmitted and received, but not at the same time. This type of operation requires a simplex transceiver and only one RF channel.
If the modem is connected to only a receiver or transmitter instead of a transceiver, data transmission is one-way. For example, if the modem is connected to only a transmitter, data can be transmitted from a site but not received.
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THEORY OF OPERATION
3-3001-3282-101/102
3.3 DATA TONE BANDWIDTH
3.3.1 INTRODUCTION
The baud rate and modulating frequencies utilized by each of the programmable operating formats are shown in Table 2-2. As indicated, 300 baud full- or half-duplex data rates are available with the Bell 103 mode and 1200 baud full- or half-duplex data rates are available with the Bell 202 mode. However these standards are intended primarily for use with a two-wire phone line which provides simultaneous two-way communication. Operation with an RF link is different because a single RF channel can provide communication in only one direction at a time.
3.3.2 PHONE LINE AND RF LINK BANDWIDTH
The two tones used by this modem to transmit and receive data are in the audio range of approximately 300-3000 Hz. With a 2-wire phone line, full-duplex data transmission is achieved by frequency multiplexing two 300-baud channels into the 3000 Hz bandwidth of the phone line (refer to Figure 3-2). Each of these 300 baud channels use two different frequencies. With half-duplex operation or pseudo full-duplex operation utilizing a back channel (refer to next section), only one main data channel is transmitted at a time. The occupied bandwidth can be greater and data can be transmitted at higher baud rates.
With an RF link, each RF channel also has a bandwidth of 3000 Hz. In half-duplex applications which use a single RF channel, 300/1200 baud rates are available. For full-duplex operation, two RF channels are required (similar to a 4-wire phone line). Since two 3000 Hz bandwidth channels are then available, full-duplex 1200 baud data transmission is possible (versus 300 baud with a 2-wire phone line).
3.4 GENERAL AND LOOPBACK MODES
3.4.1 GENERAL MODES
When a General operating mode is selected, the receive and transmit filters in modem IC U230 are configured for different frequencies. If the selected mode is a full-duplex mode, the transmit filter is set for the transmit frequency and the receive filter is set for the receive frequency shown in Table 2-2. If the selected mode is a half-duplex mode, the configuration of the receive and transmit filters is controlled by the RTS input of the RS-232 port. If RTS is high (indicating data is to be transmitted), the transmit filter is set to the transmit frequency and the receive filter is set to the back channel (refer to Section 3.5.3). If the RTS input is low, the receive filter is set to the receive frequency and the transmit channel is set to the back channel.
-
THEORY OF OPERATION
3-4001-3282-101/102
3.4.2 LOOPBACK MODES
When a Loopback mode is selected, both the filters in U230 are configured for the same frequency. Half-duplex operation in the Loopback modes is the same as it would be in the General modes because the back channel is not used.
If a full-duplex originate mode is selected, the filters are set to the transmit frequency; if a full-duplex answer mode is selected, they are set to the receive frequency.
3.5 TRANSMITTING DATA
NOTE: The levels in the following information are the levels at the RS-232 port. The levels on the pins of U230 are the inverse of these levels because of the inversion produced by U240.
3.5.1 INTRODUCTION
The transmit data signal originates from the data equipment. This data signal is applied to the TD (Transmit Data) input of the RS-232 port, inverted and converted to TTL by U240, and then applied to the TxD input of U230 and converted to the MARK and SPACE tones. These tones are fed out of U230 on the TxA (Transmit Audio) pin. They are then routed to a separate RF transmitter module where they frequency modulate the RF signal.
3.5.2 DTR SIGNAL
This signal indicates to the modem that the data equipment connected to the RS-232 port is ready to transmit or receive data.
3.5.3 RTS SIGNAL
When the equipment connected to the RS-232 port is ready to send data, it brings the RTS (Request-To-Send) input high. This signal must remain high for the duration of the data transmission. If the DTR input is low, bringing the RTS input high has no effect. It is common protocol that a SPACE (logic 0 or low) be presented to the Transmit Data (TxD) input just before the RTS input is made high. When the data transmission is finished, the RTS input is brought back low which disables the transmitter section of U230. In the half-duplex General modes, the RTS input also controls the transmit and receive filters in U230 as described in Section 3.4.1.
-
THEORY OF OPERATION
3-5001-3282-101/102
3.5.4 DELAY PERIOD
When the RTS input of the RS-232 port goes high, a delay period tRC (On) is initiated (refer to Table 3-1). During this delay period, a carrier is transmitted to alert the other modem that data is coming. After this delay period expires, the Clear-To-Send (CTS) output of the RS-232 port goes high to indicate to the data equipment that it may start sending data. Data is fed into the modem on the Transmit Data (TxD) pin of the port.
3.5.5 DATA FORMAT
NOTE: The data from the data equipment is inverted by U240. However, it is inverted again at the receiving end, so the logic level at the RS-232 port is the same on both ends.
The data from the data equipment is converted to audio tones by U230 using FSK (Frequency-Shift-Keying) modulation. A Mark tone is produced by a logic 0 (low) input to the RS-232 port, and a Space tone is produced by a logic 1 (high) input. The frequency of these tones is shown in Table 2-1. When the TxD input changes states, the tone frequency changes without any interruption in the signal (modulation is phase continuous). The audio tones are synthesized by U230 using digital techniques.
Transmit filtering in U230 attenuates sideband energy present in the square-wave digital signal generated by U230. This transforms into a sine wave. Transmit filtering also prevents interference with the back channel (not used) or the other duplex channel.
3.5.6 COMPLETING DATA TRANSMISSION
When the data equipment is through sending data, it brings the RTS input of the RS-232 port back low (Off). The TxD input is then disabled and a timing period tRC (Off) begins (refer to Table 3-1). With Bell 202 modes, soft turn-off and squelch occur during this timing period. Other modes do not utilize either function. At the end of this period, the CTS output of the RS-232 port goes back low (Off).
The following is a brief description of soft turn-off and squelch:
Soft Turn-Off
When the RTS input of the RS-232 port goes low at the end of a message, transients may be generated which could cause erroneous data to be received at the other modem. During soft turn-off, a 900 Hz Soft Carrier Turn-off Tone is transmitted for a period tSTO after RTS goes low. This provides a steady Turn Off tone followed by a silence at the other modem so that transients are not interpreted as data. The 900 Hz Soft Carrier Turn-off is not available in Bell 103 mode.
Squelch
The squelch period tSQ is initiated when the RTS input of the RS-232 port goes low and if in Bell 202 mode the 900 Hz Soft Carrier Turn-off Tone is transmitted for tSTO (25 ms). During this period, the CD output is clamped low (Off) which forces the RD output low. This disables the data receiver between the time RTS goes low and the start of carrier detect so that transients are not demodulated.
-
THEORY OF OPERATION
3-6001-3282-101/102
3.6 RECEIVING DATA
NOTE: The levels in the following information are the levels at the RS-232 port. The levels on the pins of U230 are the inverse of these levels because of the inversion produced by U240.
3.6.1 INTRODUCTION
The receive data signal is FSK-modulated tones from an RF receiver module. This signal is applied to the RxA (Receive Audio) input of modem IC U230. This device filters the tones to attenuate out-of-band frequencies and then convert the tones to digital data. The data is then filtered again and fed out of U230 on the RxD pin. U240 inverts the data and converts it to RS-232 levels. It is then applied to the RxD pin of the RS-232 port.
3.6.2 DTR SIGNAL
The DTR signal indicates that the data equipment connected to the port is ready to receive or transmit data.
3.6.3 CARRIER DETECT (CD) SIGNAL
When a tone is detected on the RxA input of U230 for a time tCD (On), the CD output of the RS-232 port goes high. This tells the data equipment that data is coming. FSK-modulated tones on the RxA input are then converted to digital data and fed out on the RxD output of the port.
Table 3-1 MODEM TIMING PARAMETERS (BELL)
Symbol Description Bell 103 Orig Bell 103 Answer
Bell 202 Units
tRC (On) RTS to CTS on delay 30/60/180/240 30/60/180/240 30/60/180/240 ms
tRC (Off) RTS to CTS off delay 0.5 0.5 0.5 ms
tCD (On) Carrier Det on delay 8-20 8-20 6-12 ms
tCD (Off) Carrier Det off Delay 6-20 6-20 3-8 ms
tSQ Receiver squelch duration 60 60 33 ms
tSTO Transmitter soft turn-off duration - - 25 ms
-
THEORY OF OPERATION
3-7001-3282-101/102
3.6.4 COMPLETING DATA RECEPTION
When a loss of carrier tone is detected for a time tCD (Off), the CD output off the RS-232 port goes low (Off) and the RxD output is clamped to a Mark.
Figure 3-3 MODEM INTERCONNECT DIAGRAM
TRANSMITTERRF
RFRECEIVER
RX DATA
TX DATA
TX KEYING
RECEIVER
TRANSMITTER
INTERFACE
CONTROL
REQUEST TO SEND (RTS)
DATA TERMINAL READY (DTR)
CLEAR TO SEND(CTS)
CARRIER DETECT (CD)
U304
PORTRS-232
UNITTELEMETRY
TX DATA
RTS
DTR
CTS
CD
RX DATA
U230
MODEM ASSEMBLY
-
SECTION 4
4-1
001-3282-101/102
PARTS LIST
023-3282-352
C 100 610-3674-680 68pF 5% NPO 0603
C 101 610-3674-680 68pF 5% NPO 0603
C 102 610-3674-680 68pF 5% NPO 0603
C 103 610-3674-680 68pF 5% NPO 0603
C 104 610-3674-680 68pF 5% NPO 0603
C 105 610-3674-680 68pF 5% NPO 0603
C 106 610-3674-680 68pF 5% NPO 0603
C 110 610-3674-680 68pF 5% NPO 0603
C 111 610-3674-680 68pF 5% NPO 0603
C 112 610-3674-680 68pF 5% NPO 0603
C 113 610-3674-680 68pF 5% NPO 0603
C 114 610-3674-680 68pF 5% NPO 0603
C 115 610-3674-680 68pF 5% NPO 0603
C 116 610-3674-680 68pF 5% NPO 0603
C 117 610-3674-680 68pF 5% NPO 0603
C 118 610-3674-680 68pF 5% NPO 0603
C 119 610-3674-680 68pF 5% NPO 0603
C 120 610-3674-680 68pF 5% NPO 0603
C 121 610-3674-680 68pF 5% NPO 0603
C 200 610-3675-103 .01MF X7R K 0603 CHPR
C 201 610-3675-103 .01MF X7R K 0603 CHPR
C 202 610-9224-011 4.7UF, 16V,SMD A,20%, TAN
C 203 610-3609-104 .1UFD X7R J 1206 RL
C 204 610-3675-102 .001uF 10% X7R 0603
C 220 610-3674-220 22pF 5% NPO 0603
C 221 610-3674-220 22pF 5% NPO 0603
-
PARTS LIST
4-2
001-3282-101/102
C 222 610-3675-103 .01MF X7R K 0603 CHPR
C 230 610-3674-220 22pF 5% NPO 0603
C 231 610-3674-220 22pF 5% NPO 0603
C 232 610-3609-104 .1UFD X7R J 1206 RL
C 233 610-2625-220 22UFD 16V SMD TANT RL
C 234 610-3609-104 .1UFD X7R J 1206 RL
C 235 610-3609-104 .1UFD X7R J 1206 RL
C 240 610-9224-011 4.7UF, 16V,SMD A,20%, TAN
C 241 610-9224-011 4.7UF, 16V,SMD A,20%, TAN
C 242 610-3609-473 .047UF X7R J1206CHP RL
C 243 610-2628-338 .33UFD 35V SMD TANT RL
C 244 610-2628-338 .33UFD 35V SMD TANT RL
C 245 610-2628-338 .33UFD 35V SMD TANT RL
C 250 610-3606-105 1uf 16V 1206 CHIP CAP
C 251 610-3674-680 68pF 5% NPO 0603
C 400 610-3609-104 .1UFD X7R J 1206 RL
C 401 610-3675-103 .01MF X7R K 0603 CHPR
C 402 610-3675-103 .01MF X7R K 0603 CHPR
C 403 610-3674-101 100pF 5% NPO 0603
C 404 610-3674-680 68pF 5% NPO 0603
C 405 610-3675-102 .001uF 10% X7R 0603
C 406 610-3674-101 100pF 5% NPO 0603
C 407 610-3675-103 .01MF X7R K 0603 CHPR
C 408 610-3675-102 .001uF 10% X7R 0603
C 450 610-3609-104 .1UFD X7R J 1206 RL
C 451 610-3675-102 .001uF 10% X7R 0603
C 452 610-3675-103 .01MF X7R K 0603 CHPR
C 453 610-3675-103 .01MF X7R K 0603 CHPR
C 454 610-3674-221 220pF 5% NPO 0603
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PARTS LIST
4-3
001-3282-101/102
C 455 610-3675-102 .001uF 10% X7R 0603
C 456 610-3675-103 .01MF X7R K 0603 CHPR
C 457 610-3675-103 .01MF X7R K 0603 CHPR
C 458 610-9224-011 4.7UF, 16V,SMD A,20%, TAN
C 459 610-9224-011 4.7UF, 16V,SMD A,20%, TAN
CR 220 649-4001-215 DUAL COLOR, RED/GRN LED,
CR 400 623-2016-919 SI 9.1V ZENER SOT23
EP 250 617-2503-010 FERRITE BEAD SMD 1233
F 250 634-5000-115 1.5AMP FUSE SMD VERY FAST
L 250 642-9008-109 1.0 UHY SMT POWER INDUCTO
PC 001 035-3282-350 3282 LTR MODEM PCB
Q 250 676-0003-657 XSTR,SI,PNP,SOT-23
Q 251 676-0003-658 XSTR, SI,NPN SOT-23
Q 252 676-0003-658 XSTR, SI,NPN SOT-23
Q 253 676-0003-658 XSTR, SI,NPN SOT-23
Q 254 676-0003-658 XSTR, SI,NPN SOT-23
Q 255 676-0003-658 XSTR, SI,NPN SOT-23
Q 256 676-0003-658 XSTR, SI,NPN SOT-23
R 200 669-0155-104 100k OHMS J 063W 0603 CHI
R 210 669-0155-104 100k OHMS J 063W 0603 CHI
R 211 669-0155-104 100k OHMS J 063W 0603 CHI
R 212 669-0155-104 100k OHMS J 063W 0603 CHI
R 213 669-0155-104 100k OHMS J 063W 0603 CHI
R 214 669-0155-104 100k OHMS J 063W 0603 CHI
R 215 669-0155-104 100k OHMS J 063W 0603 CHI
R 216 669-0155-104 100k OHMS J 063W 0603 CHI
R 217 669-0155-104 100k OHMS J 063W 0603 CHI
R 218 669-0155-104 100k OHMS J 063W 0603 CHI
R 220 669-0155-104 100k OHMS J 063W 0603 CHI
-
PARTS LIST
4-4
001-3282-101/102
R 221 669-0155-104 100k OHMS J 063W 0603 CHI
R 222 669-0155-104 100k OHMS J 063W 0603 CHI
R 223 669-0155-104 100k OHMS J 063W 0603 CHI
R 224 669-0155-225 2.2 M OHM J 063W 0603 CHI
R 225 669-0155-222 2.2K OHMS J 063W 0603 CHI
R 227 669-0155-472 4.7K OHM J 063W 0603 CHIP
R 230 669-0155-104 100k OHMS J 063W 0603 CHI
R 231 669-0155-225 2.2 M OHM J 063W 0603 CHI
R 232 669-0155-104 100k OHMS J 063W 0603 CHI
R 240 669-0155-390 39 OHM J 0603 CHIP/R
R 248 669-0155-472 4.7K OHM J 063W 0603 CHIP
R 249 669-0155-222 2.2K OHMS J 063W 0603 CHI
R 250 669-0155-222 2.2K OHMS J 063W 0603 CHI
R 251 669-0155-103 10K OHMS J 063W 0603 CHIP
R 252 669-0155-103 10K OHMS J 063W 0603 CHIP
R 253 669-0155-103 10K OHMS J 063W 0603 CHIP
R 254 669-0155-104 100k OHMS J 063W 0603 CHI
R 255 669-0155-473 47K OHMS J 063W 0603 CHIP
R 256 669-0155-473 47K OHMS J 063W 0603 CHIP
R 257 669-0155-104 100k OHMS J 063W 0603 CHI
R 258 669-0155-473 47K OHMS J 063W 0603 CHIP
R 259 669-0155-473 47K OHMS J 063W 0603 CHIP
R 260 669-0155-104 100k OHMS J 063W 0603 CHI
R 261 669-0155-473 47K OHMS J 063W 0603 CHIP
R 262 669-0155-473 47K OHMS J 063W 0603 CHIP
R 263 669-0155-473 47K OHMS J 063W 0603 CHIP
R 264 669-0155-473 47K OHMS J 063W 0603 CHIP
R 265 669-0155-473 47K OHMS J 063W 0603 CHIP
R 266 669-0155-473 47K OHMS J 063W 0603 CHIP
-
PARTS LIST
4-5
001-3282-101/102
R 267 669-0155-473 47K OHMS J 063W 0603 CHIP
R 268 669-0155-473 47K OHMS J 063W 0603 CHIP
R 269 669-0155-473 47K OHMS J 063W 0603 CHIP
R 270 669-0155-390 39 OHM J 0603 CHIP/R
R 271 669-0155-390 39 OHM J 0603 CHIP/R
R 272 669-0155-390 39 OHM J 0603 CHIP/R
R 275 669-0155-390 39 OHM J 0603 CHIP/R
R 400 662-0130-104 100K SMD TRIMMER
R 401 669-0155-153 15k OHMS J 063W 0603 CHIP
R 402 669-0155-563 56K OHMS J 063W 0603 CHIP
R 403 669-0155-684 680K OHM J 063W 0603 CHIP
R 404 669-0155-684 680K OHM J 063W 0603 CHIP
R 405 669-0155-184 180K OHMS J 063W 0603 CHI
R 406 669-0155-184 180K OHMS J 063W 0603 CHI
R 407 669-0155-273 27K OHMS J 063W 0603 CHIP
R 408 669-0155-563 56K OHMS J 063W 0603 CHIP
R 409 669-0155-104 100k OHMS J 063W 0603 CHI
R 414 669-0155-471 470 OHMS J 063W 0603 CHIP
R 415 669-0155-471 470 OHMS J 063W 0603 CHIP
R 416 669-0155-223 22K OHMS J 063W 0603 CHIP
R 417 669-0155-684 680K OHM J 063W 0603 CHIP
R 418 669-0155-104 100k OHMS J 063W 0603 CHI
R 450 669-0155-563 56K OHMS J 063W 0603 CHIP
R 451 669-0155-273 27K OHMS J 063W 0603 CHIP
R 452 669-0155-563 56K OHMS J 063W 0603 CHIP
R 453 669-0155-104 100k OHMS J 063W 0603 CHI
R 454 669-0155-104 100k OHMS J 063W 0603 CHI
R 455 669-0155-563 56K OHMS J 063W 0603 CHIP
R 456 669-0155-153 15k OHMS J 063W 0603 CHIP
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PARTS LIST
4-6
001-3282-101/102
R 457 662-0130-103 10K OHM SMD TRIMMER
R 458 669-0155-103 10K OHMS J 063W 0603 CHIP
R 459 669-0155-103 10K OHMS J 063W 0603 CHIP
R 460 669-0155-471 470 OHMS J 063W 0603 CHIP
RM 000 684-1606-062 SLDR 62/36/2 H20 CLEAN
S 101 683-5100-108 SMT DIP SW 8 POS SPST
U 200 644-2003-067 5V REG MICROPOWER SO-8
U 205 644-2003-074 MC33164D LOW V SENSOR
U 220 644-5011-309 MC68HC711E9CFN2
U 230 644-3988-013 BELL 202+ MODEM 73K302LIH
U 240 644-2023-034 RS232 TRANSCEIVER AUTO SH
U 400 644-2020-017 QUAD OPAMP SO-14 33174
U 401 644-3016-053 3 2CH ANALOG MUX/DEMUX
U 450 644-2020-017 QUAD OPAMP SO-14 33174
Y 220 621-0008-001 8.0MHZ X HC495-SMD T&R
Y 230 621-0011-061 11.059 MHZ X HC495-SMD T&
023-3282-350
A 001 023-3282-352 3282 MODEM REV2 AUTO INSE
CR 250 623-2503-180 18V J 1W ZENER REEL
HW 102 615-7109-010 POLARIZING KEY BOX CNT
J 101 615-0506-025 25P RT ANG D-SUB W/IRT
J 102 615-7104-005 HDR 10POS RA SHROUDED
J 103 615-0506-115 15 PIN PCB MOUNT DE15 FEM
ML 000 664-4800-099 SFTW COPYRIGHT 1999(DRL)
ML 001 659-1154-003 LBL SER # BLANK
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PARTS LIST
4-7
001-3282-101/102
023-3282-002
A 001 023-3282-350 HAND INSERT 3282 MODEM RE
HW 002 675-0604-010 SCR PHILLIPS PANHD 440
HW 003 674-6002-101 HOLE PLUG 3/16IN.
HW 004 675-1204-006 SCR #4 PHL FLT 82 ZPS
HW 005 696-4504-008 WASHER SHLDR #4X.046
HW 305 675-1604-010 4-40MACH PAN HD ZPS PH
ML 000 004-3282-003 MODEM SETUP INSTRUCTIONS
MP 002 014-0778-009 ENCL SGL SMALL CRMATE
MP 003 312-6373-026 4-40 HEX THREADED SPACER
MP 008 017-2225-036 TELEMETRY ENCLOSURE END P
MP 009 017-2225-611 REAR COV RS232 UNPNT
MP 011 017-2225-899 TELEMETRY LINK
MP 305 013-1160-103 4-40 HEX SPAC MALE/FEM
-
PARTS LIST
4-8
001-3282-101/102
250-3282-002
A 001 023-3282-350 HAND INSERT 3282 MODEM RE
HW 002 675-0604-010 SCR PHILLIPS PANHD 440
HW 003 674-6002-101 HOLE PLUG 3/16IN.
HW 004 675-1204-006 SCR #4 PHL FLT 82 ZPS
HW 005 675-1206-306 3/16IN.L. STEEL MACHINE S
HW 005 696-4504-008 WASHER SHLDR #4X.046
HW 305 675-1604-010 4-40MACH PAN HD ZPS PH
ML 000 004-3282-003 MODEM SETUP INSTRUCTIONS
ML 000 041-0419-025 DRL WARRANTY REGISTRATION
ML 000 051-0403-429 DIE CUT PKG CONTAINER
ML 000 659-9003-002 MADE IN USA LABEL SM
ML 001 021-3325-344 1200 BAUD REPLACEMENT MOD
MP 002 014-0778-009 ENCL SGL SMALL CRMATE
MP 003 312-6373-026 4-40 HEX THREADED SPACER
MP 008 017-2225-036 TELEMETRY ENCLOSURE END P
MP 009 017-2225-611 REAR COV RS232 UNPNT
MP 010 017-2225-749 MTG PLT TELEM CRMATE
MP 011 017-2225-899 TELEMETRY LINK
MP 305 013-1160-103 4-40 HEX SPAC MALE/FEM
-
SECTION 5
5-1001-3282-101/102
COMPONENT LAYOUT
Figure 5-1 3282 MODEM COMPONENT LAYOUT
1999 Dataradio COR Ltd.
Company Confidential
-
C25168pF1
C250
47K
R269
47KR268
R267
47K
R26647K
Q2532N3904
Q2522N3904
68pF
C106
68pF
C105
68pF
C104
68pF
C103
68pF
C102
68pF
C101
68pF
C100
68pF
C121
68pF
C120
68pF
C119
68pF
C118
68pF
C117
68pF
C116
68pF
C115
68pF
C114
68pF
C113
68pF
C112
68pF
C111
68pF
C110
Q2502N3906
1.0uHL250
Q2562N3904
Q2552N3904
Q2542N3904
Q2512N3904
EP250
1N4746A18VCR2505%
F2501.5A
J1021
J1022
J1023
J1024
J1025
J1026
J1027
J1028
J1029
J10210
J103-11
J103-22
J103-33
J103-44
J103-55
J103-66
J103-77
J103-88
J103-99
J103-1010
J103-1111
J103-1212
J103-1313
J103-1414
J103-1515
2.2KR249
MC14053BU401
14Z 13
Y1
11
S 12Y0 TP401
031_060_TestPoint
MH3REF1
47KR263
47K
R255
47KR256
47KR264
47K
R258
47KR259
47KR265
47K
R261
47KR262
470
R414
100KR257
100KR254
100KR260
2.2KR250
10KR253
10KR252
10KR251
MC33174DU450-E
11GND
4PWR
MC33174DU400-E
11ND
4R
MOB_TX_DATA
WB_OUT
WB_OUT
RX_DATA
RX_DATA
SUB_AUD_DATA
B_AUD_DATA
TX_DATA
WB_IN
WB_IN
WB_IN
SOURCE13.6V_FUSED
_FUSED
Q
TX_MUTE
ARQ
_SQUELCH
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
PTT
RX_TX
WB_SEL
INTERCEPT
FINISH:
MATERIAL:
RELEASE DATE:
REFERENCE:
.XXX
.XX
MMDECIMALS
APPROVED BY:
CHECKED BY:
LAST MODIFIED BY:
DATE:
DATE:
DATE:TOLERANCE UNLESS
OTHERWISE SPECIFIED
APPROVED BY: DATE:
bhaman
m:\jdt_release_archive\2423282\3282-350.2\3282_350.2.tc
3/23/00
EXTERNAL CONNECTORWB_IN
WB_OUT
FREQ_SELECT
RSSI
13.6V
_PTT_OUT
SQUELCH_IN
TX_DATA
GROUND
RX_DATA
RX_DATA
WB_OUT
GROUND
_ARQ_OUT
TX_RX
SUB_AUD_DATA
13.6V
13.6V
_TX_MUTE_OUT
_INTERCEPT
TX_DATA
WB_IN
GROUND
_PTT_OUT
SQUELCH_IN
MOBILE RADIO CONNECTOR
3282 Modem Schematic
Figure 8-11999 Dataradio COR Ltd.COMPANY CONFIDENTIAL6-1
001-3282-101/102
4.7KR248
4.7KR227CR220
R
G
12
4 3
J4002
J4001
100KR418
031_060_TestPointTP400
C2220.01
JICR201
22pFC230
22pFC231
0.001C204
0.1C203
2.2MR224
2.2KR225
39R270
39R275
39R271
39
R272
4.7C459
4.7C458
22pFC221
22pFC220
0.01C201
0.01C200
0.001
C408
0.01
C407
100pFC406
0.001C405
680K
R404
680K
R403
100K
R454
100K
R453
68pFC404
100pFC403
0.01
C402
0.01
C401
0.01
C457
0.01
C4560.001C455
220pFC454
0.01
C453
0.01
C452
0.001
C451
C2024.7
4.7C241
4.7C240
U200LP2951
2SENSE
6+5TAP
3SD
7FB
8VCC
4GND
5_ERR
1+5OUT
U210
2TD
1_PBRST
3TOL
8VCC
7_ST
5RST
4GND
6_RST
U205
MC33164D
4GND
2INPUT
1_RESET
8NC8
7NC7
6NC6
5NC5
3NC3
U23073K302L
20_CS
1CLK
15VCC
12ALE
22RXD
23RXCLK
28GND
24ISET
8AD4
7AD3
18TXCLK
16TXA
26VREF
2XTL1
21TXD
9AD5
6AD2
4AD0
5AD1
14_RD
25RESET
19EXCLK
13_WR
11AD7
10AD6
17_INT
27RXA
3XTL2
MC68HC711E9CFN2U220
12PC3|AD3
44PE4|AN4
46PE5|AN5
48PE6|AN6
50PE7|AN7
27PA7|PA1|OC1
43PE0|AN0
45PE1|AN1
52VRH
21PD1|TXD
22PD2|MISO
23PD3|MOSI
24PD4|SCK
51VRL
5E
49PE3|AN3
26VCC
33PA1|IC2
32PA2|IC1
31PA3|IC4|OC5|OC1
30PA4|OC4|OC1
29PA5|OC3|OC1
28PA6|OC2|OC1
3MODA|_LIR
2MODB|VSTBY
19_IRQ
18_XIRQ
17_RESET
34PA0|IC3
47PE2|AN2
7EXTAL
8XTAL
1GND
25PD5|_SS
39PB3|A11
38PB4|A12
37PB5|A13
36PB6|A14
35PB7|A15
20PD0|RXD
13PC4|AD4
14PC5|AD5
15PC6|AD6
16PC7|AD7
42PB0|A8
41PB1|A9
40PB2|A10
4STRA|AS
6STRB|R|_W
9PC0|AD0
10PC1|AD1
11PC2|AD2
MAX3243U240
9T1OUT
21_INVALID
10T2OUT
17R3OUT
5R2IN
6R3IN
13T2IN
1C2+
8R5IN
16R4OUT
24C1-
2C2-
11T3OUT
7R4IN
14T1IN
4R1IN
26VCC
3V-
23FORCEON
25GND
27V+
20R2OUTB
19R1OUT
18R2OUT
28C1+
15R5OUT
22_FORCEOFF
12T3IN
S101168
S101157
S101146
S101135
S101124
S101113
S101102
S10191
11.059MHzY230
R410JIC
R412JIC
180K
R406
100KR223
R218100K
R220100K
22C233
C2350.1
C2340.1
C2320.1
R210100K
R211100K
R212100K
R213100K
R214100K
R215100K
R216100K
R217100K
R230100K
100KR232
R2312.2M
J101-11
J101-22
J101-33
J101-44
J101-55
J101-66
J101-77
J101-88
J101-2020
J101-2222
C2450.33
C2440.33
R24039
C2420.047
C2430.33
Y2208.000MHz
U400-C
MC33174D8
10
9
MC14053BU401
15Z 1
Y1
10
S 2Y0
MC14053BU401
4 Z3Y1
9
S5Y0
MC14053BU401
6 _E
16 VDD 7VEE
8VSS
CW
CCW
R411JIC
CW
CCW10K
R457
CW
CC
W
100KR400
TP450031_060_TestPoint
031_060_TestPointTP220
680KR417
56KR402
56K
R408
R45556K56K
R450
56K
R452
470
R460
470
R415
U450-C
MC33174D
810
9
27K
R451
27K
R40722KR416
180K
R405
15KR456
R40115K
100KR200
JIC
R413
R222100K
100KR221
10KR458
R45910K
100KR409
0.1
C400
0.1
C450
CR400
5%9.1V
BZX84C
GPW
MC33174D
U450-B7
5
6
U450-A
MC33174D
13
2
U400-A
MC33174D1
3
2
U400-D
MC33174D14
12
13
U400-B
MC33174D7
5
6MC33174D
U450-D14
12
13
MOB_TX_DATA
WB_OUT
RX_DATA
SU
TX_DATA
SOURCEVREF
VREF
VREF
VREF
VREF
VREF
13.6V
13.6V_FUSED
RX_AUDIO
RX_AUDIO
TX_AUDIO
TX_AUDIO
TXD
TXD TXD
CS_0
CS_0
RTS
RTS
CTS
CTS
DTR
DTR
DCD
DCD
RXDRXD
RXD
AD_3
AD_3
AD_4
AD_4
AD_5
AD_5 _IR_IRQ
AD_1
AD_1
CS_2
CS_2
CS_4
CS_4
CS_3
CS_3
TX_MUTE
AD_0
AD_0
AD_6
AD_6
AD_2
AD_2
ARQ
_SQUELCH
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
SOURCEVCC
PTT
PTT
AD_7
AD_7
CS_1
CS_1RX_TX
WB_SEL
WB_SEL
WB_SEL
INTERCEPT
TP450
Short For Low Impedance
* These Parts Are Placed For Bootstrap Mode
*
*
*
RS232_RI
OPT 3
OPT 2
OPT 1
HALF/FULL DPLX
SQUELCH INVERT
BELL 202/103
CONV/ARQ
NORM/LOOP
COMPUTER CONNECTOR
RS232_DTR
RS232_DCD
RS232_GND
RS232_DSR
RS232_CTS
RS232_RTS
RS232_TXD
RS232_RXD
SHIELD_GND
Section 1: General InformationIntroductionModem DescriptionFactory Technical ServiceProduct WarrantyReplacement PartsFactory RepairGeneral Specifications
Section 2: Modem SetupInterconnect Cable InstallationIntroductionUser Interface3282 LEDs
Factory Default SettingsIntroductionReceive Input Level
AdjustmentsIntroductionDip Switch S101Transmit Output Level Adjustment
Section 3: Theory of OperationIntroductionFull-Duplex/Half Duplex OperationData Tone BandwidthIntroductionPhone Line and RF Link Bandwidth
General and Loopback ModesGeneral ModesLoopback Modes
Transmitting DataIntroductionDTR SignalRTS SignalDelay PeriodData FormatCompleting Data Transmission
Receiving DataIntroductionDTR SignalCarrier Detect (CD) SignalCompleting Data Reception
Section 4: Parts ListComponent LayoutSchematic