rc1000a polar axis antenna controller

8/12/2019 RC1000A POLAR AXIS ANTENNA CONTROLLER

1/50

RC1000A Ante nna Co n t ro l le r Ch a p ter 3 .0 Theo ry o f Op era t ion : Ov erv iew 1

RC1000A POLAR AXIS

ANTENNA CONTROLLER

v 3.80

CONTENTS SUBJECT TO CHANGE11.01.00

RESEARCH CONCEPTS, INC.5420 MARTINDALE ROAD

SHAWNEE, KANSAS 66218-9680 USAPhone: 913/422-0210; Fax: 913/422-0211

E-mail: [email protected] Web: www.researchconcepts.com


2/50


3/50


2.0 RC1000A REVISION HISTORYDATE VERSION DESCRIPTION

12-20-89 1.0 - Original

4-23-90 1.1 - Allowed the user to specify the 'SLOW' mode speed index.

4-26-90 2.0 - Allowed the user to specify the 'FAST' mode speed index.- Added new satellites to the preset select list.

8-24-90 2.1 - Implemented motion detect alarm software to protect theantenna in the event of a sensor failure. When an error issensed, the RC1000A displays "ANT/SENSOR ERROR" andhalts drive signals after 2 seconds.

- Implemented a relative SKEW position display whenever the CWor CCW SKEW keys are depressed and the position field isactive. Relative position is between P00 and P99.

- Autoscaled reed count input to work with any sensor resolution.Count is scaled between the EAST and WEST limits with WESTbeing mapped to a count of 980.

10-4-90 2.2 - The unit now automatically carries over the correct polarizationposition upon termination of an AUTO move.

- Allowed the user to OVERWRITE position data when in SETmode instead of allowing multiple positions with the same name.- Alphabetized satellite preset list.

12-20-90 2.3 - Major revision to accommodate future remote PC software. Added Auto-Pol feature whereby Pol control can be slaved to areceiver. Changed display format to indicate relative position ofantenna to a target by making use of lower and upper casenames. Re-ordered satellite list by longitude. Whenprogramming, controller returns to last used location in SET listinstead of starting from the beginning.

1-30-91 2.31 - The satellite list presented to the user in AUTO mode is nowsorted by ascending orbital position. SBS6 and Galaxy6 wereadded to the SET mode list. A small positioning bug, found onlyin V2.3, was fixed.

6-12-91 2.32 - updated satellite list.- Accommodated hall effect sensor, changed fuse type.

1-3-92 2.33 - Updated satellite list.


4-14-93 2.40 - Updated satellite list.Corrected bug in sat name display and H/V pol recall system.


4-15-98 - The RC1KS1 Comm option is now included as a standard

feature in all RC1000 units.


4/50


5/50


3.0 THEORY OF OPERATION - OVERVIEW

The RC1000A Automatic Satellite Antenna Positioner is designed to automate theprocess of positioning a polar antenna for a range of satellites. This microcontroller-based uniteliminates the need to manually move the antenna each time a different satellite is desired. Oncethe position and polarization have been programmed for each particular satellite, the RC1000Awill return to that position with precision every time.

The RC1000A rack mount controller was designed with commercial requirements in mind. Itoffers a range of unique features, including dual speed control, built-in Polarotor tm control, andmotion detect software to guard against sensor errors. The friendly user interface features a 2 x16-character backlit Liquid Crystal Display.

While in Manual mode, the user is able to JOG the azimuth position and SKEW polarization withthe touch of a key. AUTO mode will automatically move the antenna and polarotor to up to 50preset positions. These positions are assigned by using the SET mode, then stored in batterybacked-up memory. The user will be able to delete any of this stored data, either selectively (inDEL mode) or completely (by typing CLEAR at the USER entry in SET mode).

The user must set software limits in LIM mode. Doing so enables the unit to work with a reedswitch type of position sensor with any number of counts up to 32,000. The RC1000A will alwaysnormalize the display position to approximately 10 at the East limit and 980 at the West limit fordisplay format consistency. In the event of a sensor failure, the user can easily re-sync thesatellite positions thru the FIX mode.

The SLOW and FAST speed indexes are user-programmable, enabling the user to match theantenna drive to the antenna load for optimum C and Ku performance. It is also possible to slavethe polarization H/V toggle to commercial receivers that provide an H/V output signal. This isdone by turning the AUTO POL mode ON and telling the RC1000A whether Vertical POLcorresponds to a high or low signal on the RC1000A auto-pol input. When this feature is ON, thefront panel SKEW and POL keys are disabled.

Overall, the RC1000A is well equipped to handle the commercial requirements of hotel, school,hospital, and flexible SMATV special event feeds, as well as network affiliate secondary downlinkcontrol.


6/50

RC 1000A An te nna C o nt ro lle r C ha p te r 4 .0 Insta lla t io n 4

4.0 INSTALLATION

1. Use (4) #10-32 panel mounting screws to fasten unit into a standard 19" rack.

2. Refer to Figures 4.1 (page 6) and 4.2A and B (page 7 & 8) for detailed interconnectlegends.

a. Motor Drive Controls (3 wires)This cable connects J1 of the RC1000A and the motor mounted at the antenna. It mustbe capable of carrying the required motor current the desired distance without asignificant drop in voltage. Since this cable carries 36VDC, it is very important to protectit in conduit at all times to minimize the potential hazard for electric shock.

b. Polarotor (Skew Control) (3 wires)

This cable connects J1 of the RC1000A to the polarotor mounted at the antenna feed. Athree-conductor shielded cable is necessary for this application. To minimize noisepickup and ground loop problems, be sure to ground the shield or drain wire at terminal 8of J1 ONLY. Failure to do so may result in poor polarotor operation, or even possibledamage to the polarotor circuits.

c. Sensor (Reed - 2 wires, Hall Effect - 3 wires)

This cable connects J1 of the RC1000A to the position sensor located at the antenna.Shielded cable is necessary, and the shield or drain should be grounded at pin 2 of J1ONLY. Again, the purpose is to minimize noise pickup and eliminate ground loopproblems. Failure to do so could result in antenna tracking errors or even damage to themicrocontroller itself. Refer to Figures 4.2A and 4.2B for connections.

d. Auto-Pol (2 wires)

This cable connects J1 to the receiver H/V toggle output. Connect the signal line to pin12, J1, and the ground or return signal line to pin 8, J1.

Note : It is critical that as the antenna moves from West to East the position count shown on thedisplay MUST decrease - if it does not, pins 9 and 11 (motor drive) on J1 must bereversed - recheck Figure 4.2 and correct.


7/50

RC 1000A An te nna C on trol ler C ha p te r 4 .0 Insta lla t ion 5

FIGURE 4.1 INTERFACE DIAGRAM 1


8/50

RC 1000A An te nna C o nt ro lle r C ha p te r 4 .0 Insta lla t io n 6

FIGURE 4.2A

INSTALLATION SCHEMATIC DIAGRAM - REED SENSOR

J1

4

5

67

910

11

8

RC2000

13

4

6

J2

24-36VDC AZIMUTH MOTOR

24-36VDCELEVATION MOTORELEV DRIVE(1)

ELEV DRIVE(2)

AZIM DRIVE(1)

AZIM DRIVE(2)

18-22 AWG, SHIELDED

12-16 AWG, BRAIDED

18-22 AWG, SHIELDED

RECEIVER(OPTIONAL)

H/VOUTPUT

H/V INPUT

RETURN

INPUT

RETURN

INPUT

SKEW RE TURN

SKEW PULSE

SKEW POWER, 5.7VDC

POLAROTOR ASSEMBLY

AZIMUTHREED SENSOR

ASSEM BLY

ELEVATIONREED SENSOR

ASSEMBLY

(AUTOPOL SIGNALS)

RTN


9/50


10/50

RC 1000A A nt e nn a C o nt ro lle r............................................................5.0 Q uic k Sta rt 8

5.0 QUICK START FAMILIARIZATION

5-1 FACTORY PRESETS

When the RC1000A is shipped from the factory, the memory is clear. The Polarotor tm skew is setat 50, halfway between the 0 and 99 limits. Similarly, the polar axis position is set at 500, halfwaybetween the East and West limits of 10 and 980, respectively. The speed index defaults are 11for slow and 23 for fast. The AUTO-POL feature is OFF. This feature should not be enabled untilall satellite positions and polarizations are committed to memory, and then only if a receiver isused that has polarization output capability. The Control front panel switch is set to MANUAL. Ifit is set to REMOTE, all front panel keys will be locked out.

5-2 USER INTERFACE

The RC1000A makes use of the "Softkey" concept in the layout of the front panel. This meansthat the function of each key is not fixed, but is defined by the legend, located directly over them,on the bottom row of the display. The function of the buttons is determined by the mode shown inthe upper right hand corner of the display.

There are two levels of control in the RC1000A: Operational and Programming. Operationalcontrol consists of two modes, Manual and Auto, that are necessary for daily operation of thecontroller. The user can toggle from one mode to the other by rapidly depressing and releasingthe MODE key. The default mode is MAN.

Programming control consists of several modes, and can only be entered into by pressing theMODE key for at least five seconds. This allows the user entry into the following modes: SET,DEL, LIMITS, FIX, SPEED, and AUTO-POL. To return to manual mode depress the mode keyagain for at least 5 seconds.


11/50

RC 1000A A nt e nn a C o nt ro lle r............................................................5.0 Q uic k Sta rt 9

5-3 QUICK START PROCEDURE

1. Install unit. (Refer to Section 4.)

2. Set EAST limit - This value will be assigned a value of 10 after the west limit is set.(Section 6-5.)

3. Set WEST limit - This value will be assigned a value of 980 to normalize the count fordisplay format consistency. (Section 6-5.)

4. Set SLOW and FAST speed indexes according to the antenna load and application. Thesystem defaults are 11 for slow and 23 for fast. (Section 6-9.)

5. Validate clear memory - "NO DATA" in AUTO Mode.

6. Jog to easternmost satellite in MAN mode.

7. Assign position to satellite name and set polarization. (SET mode - Section 6-6.) If skewkeys don't seem to work, make sure that Auto-Pol is disabled. (Section 6-10.)

8. Manually jog WEST to next satellite.9. Repeat 7 & 8 for all satellites desired.

10. Check positioning accuracy with AUTO mode. (Section 6-4.)

11. Enable AUTO-POL feature if the RC1000A is slaved to a receiver. (Section 6-10.)


12/50

RC 1000A A nt e nn a C o nt roller...........................................................6-7 D e let e M o d e 10

6.0 IN-DEPTH FUNCTION DESCRIPTION

6-1 Display Screen Famil iarizationThe display screen contains two lines with 16 characters per line.

The SATELLITE NAME is either chosen from a pre-defined list (see page 17) or assigned byuser in SET mode. In MAN mode, when the name is in capital letters, this denotes that thecontroller is within one degree east or west of that particular satellite. When in small letters, thecontroller is within 1-3 degrees east or west of the satellite position. When no name is shown,the controller is not within this specified range of any satellite position assigned to memory.

The POSITION variable default shows the current position of the antenna as derived from theposition sensor pulse count. The range for antenna position is 10 to 980. This data will bereplaced with the polarization position while the SKEW buttons are being pressed, then willdefault back to the antenna position. The range for the polarization position is P00-P99.

The MODE shown on the display is the current operational status of the positioner, anddetermines the function of the Softkeys.

The KEY DESCRIPTION describes the current function of the A , B , and E keys. The programutilizes the "Softkey" concept. This means that a key does not maintain a fixed function, butinstead is periodically redefined by software to fit a particular mode of operation. Therefore, thefunction of the keys is determined by the MODE the user is currently in.


13/50


FIGURE 6.1 SCREEN OPTIONS


14/50


6-2 SWITCH FUNCTION

To simplify instructions, the key or button descriptions will always be shown in enhanced text.

MODEThis pushbutton selects between Operation and Programming mode groups, and themode within each group. The current mode will always be displayed on the screen in theupper right hand corner. See appendix for additional MODE information if using a remotecontrol option.

OPERATION MODE GROUP

AUTO Automatic

MAN Manual

PROGRAMMING MODE GROUP

LIM Limits

SET Set satellite & polarization position in memory

DEL Delete satellite from memory

FIX Correct position readout errors

SPEED Adjust fast & slow speed voltages for load

AUTO-POL Slaves the unit to a receiver with H/V output signals

To change from OPERATION Mode Group to PROGRAMMING Mode Group, or vice-versa,simply hold the MODE button in for at least five (5) seconds, then release. The new mode willnot be displayed on the screen until you have released the MODE button. This will be referredto in the text as:

Hold MODE and release

To change from AUTO to MAN, or from LIM to SET, DEL, or FIX, scroll to your selection bypushing the MODE button once. This will be referred to in the text as:

Scroll MODE


15/50


A & B

The function of these buttons is determined by the mode shown in the upper right handcorner of the display, and is described by the text appearing over them on the displaybottom line.

E

This Softkey is basically an " ENTER " button, which signifies the desired data is on thedisplay screen, and it should be saved or acted upon. The current function is defined bythe legend directly above the key, in the lower right hand corner of the display.

CW-SKEWCCW-SKEW

These two buttons adjust the polarization skew in either a clockwise or counterclockwise

direction. The user fine-tunes the horizontal and vertical polarization with these buttons.The current polarization count will display in the middle of the top line of the LCD displaywhile these keys are being pressed. NOTE: These keys are disabled when the Auto-Pol feature is enabled.

6-3 MANUAL Mode

This mode is used to manually jog the antenna's polar axis as well as toggle the polarizationbetween the H and V values of the satellite in memory closest to the antenna's polar position.

Additionally, fine-tuning the polarization with the CW/CCW Skew keys is possible in this mode.Fast and slow speeds are selected via the SPEED switch, positioned on the right side of theRC1000A faceplate. The REMOTE switch must be kept in the MANUAL position for the frontpanel keys to be active. Also, the AUTO-POL feature must be off for the CW/CCW Skew andPOL toggle key to be active (see section 6-10). If Auto-Pol is enabled, the legend above the Ekey will be RCV: rather than POL:.

Once the unit is programmed, the user can view the arc of assigned satellites simply by joggingfrom one limit to the other. When the antenna is within 3 o of an assigned satellite, that satellitename appears in lower case letters. As the antenna jogs to within 1 o of the satellite, the namechanges to upper case letters, signifying the antenna is close to an established target. Anysatellite names that have not been assigned will not display.

Likewise, as the polarization is within approximately 40o

of the target value, a lower case h or vappears in the display. The indication changes to upper case (H or V) when the probe is within10 o. No indication for polarity means the probe is positioned between h and v.


16/50


1. Check the Mode in the upper right hand corner of the display to determine if the programis in MAN mode. If the program is in the Programming Mode Group (either LIM , SET,DEL, FIX , SPEED, or AUTO-POL) hold MODE and release to get to MAN mode. If it isin AUTO mode, scroll MODE once to get to MAN mode.

2. Jog the antenna as desired using either A to move east or B to move west.

3. Toggle the polarization from H to V by pressing E (if Auto-Pol is disabled).

4. Fine-tune the polarization as desired by using the CW & CCW Skew keys (if Auto-Polis disabled).

6-4 AUTO Mode

Once the programming has been completed, day to day operation of the RC1000A is verysim p le. The user chooses a satellite, and the controller automatically moves the antenna to thecorrect position and polarization.

1. Check the Mode in the upper right hand corner of the display to determine if the programis in AUTO mode. If the program is in the Programming Mode Group (either LIM, SET,DEL, FIX, SPEED, or AUTO-POL) hold MODE and release to get to AUTO mode. If itis in MAN mode, scroll MODE once to get to AUTO mode.

2. Scroll using either A or B to desired satellite.

3. Press E to Enter.4. Antenna will automatically move to assigned position.

(While the antenna is moving, the message "STOP" will appear above the E key. Themove will be disabled if E is pressed, and the system will return to MAN mode.)

5. When the move is completed, the mode will automatically change to MANUAL mode. Inthis mode the picture can be fine-tuned using the A & B keys, and the desiredpolarization may be selected via the E key.

NOTE: WHEN THE POWER IS TURNED OFF, THE POLAROTOR PROBE MAY SLIGHTLYSHIFT POSITIONS. WHEN THE POWER IS REAPPLIED, THE POLARATOR PROBEWILL MOVE BACK TO THE POSITION IT WAS AT BEFORE POWER WAS REMOVED.FOR THIS REASON, ALWAYS LEAVE THE CONTROLLER ON.


17/50


6-5 LIMITS Mode

NOTE : To set limits, there must be someone outside at the antenna location to let theprogrammer know when the antenna has reached its physical limits of travel. It is criticalthat as the antenna moves from west to east, the position count shown on the displayMUST DECREASE . If it does not, pins 9 and 11 on J1 are reversed. Recheck Figures4.1 and 4.2 and correct.

************ WARNING *************THERE ARE NO RESTRICTIONS ON

ANTENNA MOVEMENT WHEN IN THELIMITS MODE - USE CAUTION!

**********************************

1. Go to LIMITS mode (in Programming Mode Group.)

2. Screen will prompt " SET EAST LIMIT" . The first limit must be the east limit.

3. Move antenna using A or B to the East limit while the assistant outside alerts theprogrammer when the antenna comes to within 2 inches of the east limit of the antennamount.

4. Press E to set the limit.

5. Screen will prompt " SET WEST LIMIT" for the opposing limit - Repeat steps 2 through 4.

6. Program will automatically put you back into MAN mode.

7. In order to verify that the limits have been stored correctly, turn the unit off for fiveseconds, then turn it back on. While in contact with the person outside to verify thephysical position of the antenna, jog the antenna to its maximum eastern limit. Repeatfor the western limit. If the antenna does not stop at the designated physical limit, you

must repeat these steps. Check all connections and equipment.

6-6 SET Mode

Set mode allows the user to enter a satellite name, position, and polarization settings to memory.Once a satellite has been entered into memory using SET mode, it can be automatically locatedusing AUTO mode.

1. Make sure that you are in MAN mode and the Auto-Pol feature is disabled.

2. Move antenna to the easternmost satellite position you wish to program by using the A or B buttons to jog east.

3. Hold MODE and release to go to Programming Mode Group, scroll MODE to SET.


18/50


19/50


6-7 DELETE Mode

This mode is used to delete a satellite entry.

1. Proceed to DEL mode (found in PROGRAMMING Mode Group).

2. Scroll through the ASSIGNED satellite names by pushing A .3. When the desired satellite name is shown on screen, push E .

4. System will automatically delete this satellite from memory and will return to MAN mode.

If it is necessary to delete all satellite positions from memory:

a. Scroll MODE to SET mode (section 6-6).

b. Access USER entry (see step 5b, page 16)

c. Enter CLEAR as a satellite name.

d. Press E twice to enter.

All satellites in memory will be deleted. (The predefined list of satellite names will still exist, butyou will need to reprogram the positions.)

6-8 FIX Mode

The FIX feature allows the controller to make a graceful recovery from sensor failure or theunlikely event of an errant pulse count. By using this feature, the user simply has to correct forone satellite location, and the RC1000A automatically will correct all others.

1. While in MAN mode, jog the antenna to a satellite whose location was previously storedin memory.

2. Proceed to FIX mode (found in PROGRAMMING Mode Group.)

3. Scroll through the list of assigned satellites using the A & B keys until the correctsatellite name is displayed.

4. Press the E key, RESET, to recalibrate all stored satellite locations.

5. The unit will respond with POSITION SET, and then returns to MAN mode.


20/50

RC 1000A A nt e nn a C o nt roller...........................................................6-9 Sp e e d M o d e 18

6-9 SPEED Mode

The SPEED feature allows the user to match the drive voltage levels to his particular antennaload. By using this function, the installer can accommodate a wide range of cable runs orantenna load requirements and still maintain an optimum drive level. This feature is applicable toboth slow and fast speeds. The system defaults are 11 for slow and 23 for fast.

1. Proceed to SLOW or FAST mode (found in the PROGRAMMING Mode Group.)

2. While referring to Figure 6.9 on the following page, select a speed index to yield anoutput voltage, relative to maximum, that will drive the antenna satisfactorily. Use the A & B keys to change the displayed value and the E key to fix it.

3. Try this new value while in the MAN mode to see if the results are satisfactory. If not,repeat steps 1 & 2.

6-10 AUTO-POL Mode

Auto-Pol mode is used to slave the RC1000A polarization toggle to an externally generatedsignal, normally provided by a commercial receiver. With this mode enabled, the RC1000A willchange the antenna's receive polarity as the controlling receiver's channel index is advanced.

To implement this control, the user must specify if a high level (example: 12V) or low level (0V)signal coincides with vertical polarization. By pressing the A key, the user selects a low signallevel and the RC1000A acknowledges this by changing the lo indication to upper case letters(LO) and the HI to lower case (hi). The opposite is true to select a HI level. Finally, to turn thisfunction on, the user presses the E key to toggle between ON and OFF in the display.

When this feature is ON, the CW/CCW keys are disabled in all modes, and the polarization H/Vtoggle (E key) is disabled in MAN mode. The user can tell if this feature is enabled while in MANmode, by noting a RCV:__ indication in the lower right corner of the display where POL:__typically resides. This is shown below.


21/50

RC 1000A A nt e nn a C o nt roller...........................................................6-9 Sp e e d M o d e 19

FIGURE 6.9 DRIVE VOLTAGE RELATIVE TO SPEED INDEX


22/50

RC 1000A A nt e nn a C o nt roller.......................................7.0 Ba tt e ry & Fuse Re p la c e m e nt 20

7. BATTERY & FUSE REPLACEMENT

The RC1000A requires no periodic maintenance. The only components the user should have tobe concerned with under normal circumstances are the fuses and the battery used for memorybackup.

To prolong battery life and minimize polarotor skew drift problems, the unit should be left on at alltimes.

7-1A Power Line Fuse Replacement

1. This fuse is located inside the front panel power switch. To replace, first turn the powerswitch off and unplug the unit.

2. Push in and turn the power switch counterclockwise about 1/8 of a turn, and gently pullout the switch assembly from its housing.

3. Pull out the fuse from the back of the switch, and replace it with a standard 3.0 amp, type AGC fast blow fuse. NO SUBSTITUTE VALUES ARE ACCEPTABLE. Make sure thefuse is firmly seated in the retaining cup.

4. Slide the fuse and switch assembly back into its housing, and turn clockwise to lock in.

5. Plug the unit back in, and turn the power switch on.

7-1B Motor Drive FuseRefer to page Figure 7.2 for placement of fuse F2. Should the main fuse be good andthe motor drive signals not be present, check this fuse. Its value is 6 amps, type ABC.Be sure to have the unit powered down and the line cord unplugged beforereplacing this fu se.


23/50

RC 1000A A nt e nn a C o nt roller.......................................7.0 Ba tt e ry & Fuse Re p la c e m e nt 21

7-2 Battery Replacement

When the display flashes the warning "LOW BATTERY" , a new battery should be installed toeliminate memory loss in case of power failure.

NOTE : The RAM battery backup circuit is designed to avoid loss of memory if the properprocedure is followed when changing the battery.

The two key elements in this procedure are: (1) actual time spent in changing the battery and (2)keeping the battery holder positive tab from touching the negative contact on the inside of theholder. If the tab is kept isolated from the negative terminal of the holder, changing time isextended to approximately 30 seconds. However, if the tab is allowed to short against thenegative terminal, this time is reduced to approximately 10 seconds. Therefore, if it is at allpossible, care should be taken during this procedure to hold the tab away from the negativeterminal.

1. With the power cord unplugged from the wall outlet, remove the back cover.

2. Carefully remove the battery by lifting up on the holder tab that keeps the battery inplace. Care must be taken in this procedure to prevent damage to any of thesurrounding components.

3. Replace with Duracell #DL2450 lithium coin cell. These are often available at localhardware or electrical supply stores. They can also be obtained from your RC1000Adistributor.

AS YOU INSTALL THE NEW BATTERY BE SURE THAT THE POSITIVE SIDE ISFACING UP AND IS IN DIRECT CONTACT WITH THE HOLDER TAB.

4. Replace the back cover.

5. Plug the unit back in and turn the power on. Check to see if the memory is still intact. Ifnot, it will be necessary to reset the limits and reprogram the memory. Refer to Section6-5, LIMITS Mode, and 6-6, SET Mode.


24/50


25/50

RC 1000A A nt e nn a C o nt roller..................................8.0 Instrum e nt Sp e c ific a tio ns 23

8.0 INSTRUMENT SPECIFICATIONS

A. Ini tial Inspection - Contents

1. RC1000A Automatic Satellite Antenna Positioner

(19"W x 3.50"H x 5.50"D) 10#Inspect the unit for any damage during shipping(i.e., the display is cracked or metal is bent)If so, notify shipper.

2. 12 pin Input/Output Connector

3. Manual

B. Power Requirements - 115V AC 60 Cycle, 22W, drive signals inactive

The input power line fuse is a 3.0 amp fast blow. NO SUBSTITUTES ARE ACCEPTABLE. This is the value necessary to protect the motor in the event amechanical limit is encountered or the drive mechanism becomes jammed.

The drive control line fuse is a 6.0 amps, type ABC, and is referred to as F2 on thecomponent layout schematic on page 28. This value should not be substituted withoutconsulting the factory.

C. Drive Transfer Funct ion

See Figure 8.0.

D. Non-Volatile Memory Battery

Duracell DL2450


26/50

RC 1000A A nt e nn a C o nt roller..................................8.0 Instrum e nt Sp e c ific a tio ns 24

FIGURE 8.0 DRIVE TRANSFER FUNCTION

RC2000 Drive Transfer Function (Fast Speed)

05

1015202530354045

0 2 4 6 8 10

Output Drive Current (Amps)

O u

t p u

t V o

l t a g e

( D C V o l

t s )


27/50


28/50


29/50


30/50


31/50


32/50


33/50


34/50


35/50

Resear ch Concept s RC1000A Remot e CommandsHer e ar e t he commands i mpl ement ed by t he RC1000A. Ref er t o t he RS 422document f or a compl et e descr i pt i on of t he el ect r i cal and l ogi cali nt er f ace char ac ter i s t i cs.Revi sed 9. 29. 92.Revi sed 1. 30. 98 ( sof t war e ver si on 3. 70) .Fi l e name - SABUS3. TXT.Her e ar e t he i t ems whi ch have changed.

The Pol command has been modi f i ed t o al l ow a host PC t o r emot el y enabl eor di sabl e t he aut opol f l ag.Byte 19 of t he quer y repl y repor t s t he st at us of t he aut opol f l ag.

The r epl y t o a pol ar i zat i on j og or got o command wi l l be NAK i f aut opoli s enabl ed. Pr evi ousl y t he command woul d be acknowl edged but notexecut ed.

The document at i on was changed t o pr oper l y r ef l ect t he pol ar i zat i ondi spl ay symbol . Ear l i er ver si ons of t hi s document di d not accur at el yassoci at e t he numeri c code r et ur ned as par t of t he query r epl y ( byt e19) t o the pol ar i zat i on symbol di spl ayed on t he LCD of t he cont r ol l er .

QUERY ID COMMAND The message f or mat f or t hi s quer y wi l l be . . .

byt e 0 : STXbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 30h' t he quer y command codebyt e 3 : ETXbyt e 4 : ' chksum' t he checksum

The checksum char act er i s si mpl y t he bi t - by-bi t excl usi ve OR of al l char act er s i n t hemessage st ar t i ng wi t h t he STX char act ert hr ough t he ETX char act er .

The r esponse t o t hi s quer y wi l l consi st of 11 byt es, al l asci ichar ac ter s . . .byt e 0 : ACK

byt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 30h' t he quer y command codebytes 3- 6: ' RC1K'byt es 7, 8: ' XX' where XX i s t he ver si on number , f or

exampl e i f t he cur r ent sof t war ever si on number wer e 4. 3, XX woul d be' 43' .

byt e 9 : ETXbyt e 10 : ' chksum' t he checksum

I f t he command cannot be execut ed, t he RC1000A r esponse wi l l be . . .byt e 0 : NAKbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 30h' t he quer y command codebyt e 3 : ETXbyt e 4 : ' chksum' t he checksum


36/50


37/50


38/50

i n l ower case l et t er s; ot her wi se t hesat el l i t e name i s not shown.

7 6 5 4 3 2 1 00 0 1 0 $ 0 0 _ _0 0 sat _name shown i n capi t al

l et t er s0 1 sat _name di spl ayed i n l owercase l et t er s .

1 0 sat _name not di spl ayed.

byt e 19 : Sat _pol ar i zat i on di spl ay st at us - bi nar ydat a - t he val ue of t he i nt er nalaut o$pol $enabl e$f l ag andsat $pol $di spl ay$st at us$code var i abl es. TheAut oPol f eat ur e sl aves t he RC1000' spol ar i zat i on cont r ol out put t o a di gi t ali nput f r om a s at el l i t e r ecei ver. Thi sf eat ur e i s document ed i n t he user ' s manual .

The sat $pol $di spl ay$st at us$code i ndi cat est he pr esent s t at us of t he sat el l i t epol ar i zat i on di spl ay f i el d on t he LCD ont he f r ont of t he uni t . I n REMOTE or MANUALmode, an ' H' or ' V' wi l l be di spl ayed i f asat el l i t e name i s di spl ayed i n upper casel et t er s and t he pr esent pol ar i zat i onposi t i on cor r esponds t o t he pr esethor i zont al or ver t i cal pol ar i zat i on f ort hat sat el l i t e. Ot her wi se, an ' h' or a ' v'wi l l be di spl ayed i f t he pr esentpol ar i zat i on pos i t i on i s i n t henei ghbor hood of t he pr eset hori zont al orver t i cal pol ar i zat i on pos i t i on f or t hesat el l i t e cl osest t o t he ant enna' s pr esentazi mut h posi t i on. I f nei t her of t he t wopr evi ous cases appl y the pol ar i zat i on f i el dwi l l be bl ank.

7 6 5 4 3 2 1 00 0 1 0 $ 0 _ _ _

bi t3

_0 Aut oPol Di sabl ed1 Aut oPol Enabl ed

bi t s2 1 0- - -0 0 0 ' H' di spl ayed0 0 1 ' h' di spl ayed0 1 0 ' V' di spl ayed0 1 1 ' v' di spl ayed1 0 0 ' ' ( bl ank) di spl ayed


39/50

byte 20 : Sat _azi mut h_posi t i on di spl ay st at us -bi nar y dat a - t he val ue of t he i nt er nalvar i abl e, az$posi t i on$di spl ay$st at us$code,whi ch i ndi cat es t he pr esent st at us of t heazi mut h posi t i on di spl ay f i el d on the LCDon t he f r ont of t he uni t . I n REMOTE orMANUAL mode, t he azi mut h f i el d wi l l usual l ydi spl ay t he ant enna' s pr esent azi mut hposi t i on. When t he pol ar i zat i on i s j ogged,t hi s f i el d wi l l cont ai n t he PXX wher e XX i st he pol ar i zat i on pos i t i on.

7 6 5 4 3 2 1 00 0 1 0 $ 0 0 _ _

0 0 az_posi t i on di spl ayed0 1 pol _posi t i on di spl ayed1 0 not hi ng di spl ayed i n

t he azi mut h posi t i onf i el d.

byte 21 : er r or st at us - bi nar y dat a

7 6 5 4 3 2 1 0ant $er r or s: 0 0 1 0 $ 0 _ _ _

j a ba z am t

when t he bi t i s set , i t means . . .

J am . . . t he ant enna i s j ammed/ no sensorf eedback.

AZ . . . . t he azi mut h count i s cor r upt ed.Bat . . . a l ow bat t er y i ndi cat i on has been

r ecei ved.


I f t he command cannot be execut ed, t he RC1000A r esponse wi l l bebyt e 0 : NAKbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 31h' t he quer y command codebyt e 3 : ETXbyt e 4 : ' chksum' t he checksum


40/50

QUERY NAME COMMAND

Thi s quer y command i nst r uct s t he RC1000A t o send back t o t he hostcomput er an i ndexed sat el l i t e name and azi mut h posi t i on count f r om t hel i s t of l ocat ed sat el l i t es s tored i n non- vol at i l e memor y. Thi s l i s t i scompr i sed of t hose sat el l i t es t hat wer e saved vi a t he SET mode i n t heRC1000A. A maxi mum of 50 can be i n t he l i st . Thi s quer y command

cont ai ns 7 byt es and t he f or mat i s

byt e 0 : STXbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 35h' t he quer y command code

byt es 3, 4 : ' XX' wher e XX i s t he i ndex of t he sat el l i t e namebei ng r equest ed. Normal l y t hi s woul d be ' 01't he f i r st t i me t hr u and t hen i ncr ement ed unt i lt he ' YY' ( YY bei ng t he l as t ent r y i n t he l i s t . )sat el l i t e name i s r ead.

byt e 5 : ETXbyt e 6 : ' chksum" t he checksum

The nor mal r esponse t o t hi s quer y command cont ai ns 19 byt es and t hef or mat i s as f ol l ows . . .

byt e 0 : ACKbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 35h' t he quer y command code

byt es 3, 4 : ' XX' wher e XX i s t he i ndex of t he sat el l i t enamebei ng r equest ed.

byt es 5, 6 : ' YY' wher e YY i s t he t ot al number of sat el l i t enames cont ai ned i n t he l i st .

byt es 7- 13 : Thi s f i el d wi l l cont ai n t he sat el l i t e name.

byt es 14- 16: Thi s f i el d wi l l cont ai n t he sat el l i t e azi mut hposi t i on count - 000 t o 999.



41/50

I f t he command cannot be execut ed, t he RC1000A r esponse wi l l be . . .byt e 0 : NAKbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 35h' t he quer y command codebyt e 3 : ETX

byt e 4 : ' chksum' t he checksum

AUTO COMMAND

Thi s command speci f i es t hat t he cont r ol l er move t he ant enna t o asat el l i t e. The command cont ai ns 13 byt es. Her e i s t he f or mat . . .

byt e 0 : STXbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 32h' t he command code

byt e 3 pol ar i zat i on Thi s f i el d can spec i f y ' H' , ' V'

or ' ' ( bl ank) . I f t hi s f i el d cont ai ns a bl ankt her e i s no pol ar i zat i on adj ust ment . I f t hi sf i el d cont ai ns ' H' or ' V' t he pol ar ot or i sdr i ven t o t he sat el l i t e' s pr eset hor i zont al orver t i cal pos i t i on.

byt e 4- 10 sat _name Thi s f i el d speci f i es t he sat el l i t ename. The sat _name shoul d be i n capi t all et t er s and l ef t j us t i f i ed wi t hi n t hi s f i el d.I f necessar y, t he name can be padded wi t hbl anks t o f i l l t he ent i r e f i el d.


The r epl y t o t hi s command wi l l be t he same as t he r epl y t o t he QUERYcommand except t hat t he command code f i el d wi l l be ' 32h' .

AZIMUTH JOG COMMAND

Thi s command j ogs t he ant enna i n azi mut h. The command cont ai ns 11byt es. Her e i s t he f or mat of t he command

byt e 0 : STXbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 33h' t he command codebyt e 3 : di r ec t i on Thi s f i el d can spec i f y ' E' , ' W' , or

' X' . ' E' r ef er s t o eas t and ' W' t owest . An ' X' speci f i es t hat t heant enna st op movi ng.

byt e 4 : speed Thi s f i el d speci f i es t he j og speed,ei t her ' F' ( F as t ) or ' S' ( Sl ow) .Not e t hat t hi s f i el d must cont ai n a


42/50


43/50

I f t he Aut oPol f eat ur e i s enabl ed and t he command par amet er i s ' H' ,' V' , ' C' , or ' W' t he NAK r epl y wi l l be sent t o t he host .

byt e 0 : NAKbyt e 1 : ' AA' wher e AA i s t he RC1000A addr essbyt e 2 : ' 34h' t he command codebyt e 3 : ETXbyt e 4 : ' chksum' t he checksum

I f t he command can be execut ed t he r epl y t o t hi s command wi l l be t hesame as t he r epl y t o t he QUERY command except t he command code wi l l' 34h' .


44/50


45/50


46/50


47/50


48/50


49/50


50/50

rc1000a polar axis antenna controller

Documents