1 the leader in industrial data communication solutions training: srm advanced topics
TRANSCRIPT
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SRM Block Diagram
UserEquipment To
Coax/Antenna
Data&
ControlPower
SRM Family Internal Diagram
Input/OutputInterfaceModule
(Ethernet or Serial)
RFModule
(900Mhz or 2.4Ghz)
IndicatorsSwitches
3
SRM Operational Details
Proprietary US military battlefield technology Designed to be highly secure RF Packets
Masters Create them Fill with data as necessary Transmit them regularly
Repeaters relay them Slaves fill them with data
RF packet Structure Header Data fields
Viewed at packet level, it is a full duplex RF link
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Repeaters
Repeaters are Store-and-Forward Adding the first repeater reduces the entire
radio network throughput by 50%. Adding more repeaters does not further reduce throughput. Use back to back radios to eliminate throughput reduction.
Repeaters can be configured to simultaneously operate as slaves
P2P networks can include up to two repeaters P2MP networks can have unlimited repeaters
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P2P Operation
P2P Operation RF Data handshaking User data cannot be lost in RF link Throughput Radio Identification by Callbook only
6
P2MP Operation
RF Data handshaking User data can be lost in RF link Throughput Radio Identification by
Callbook Network ID Network ID and Subnet ID
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CallBook – Multiple Paths
A radio can be permitted to communicate with any one of several masters or repeaters.
There is no guaranteed order of connection. Use with caution.
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Ethernet Networks: NIC Settings
Network Interface Card (NIC) Settings IP Address Subnet Mask Gateway
Normally the SRM Series Products do not use these settings however LincView diagnostics using UDP will require an IP address set in the master. In current versions of the SRM Ethernet radios it be pinged.
11
Ethernet Networks: Packet Types
Many packet types can be present on an ethernet network including: TCP/IP point to point
Typical MSG instructions Broadcast - DHCP and BootP requests Unigram Data Packets (UDP)
AB Logix engine PLCs use UDP for Producer/Consumer communications Remote I/O over Ethernet
Multi-cast - Streamed data such as video
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Ethernet Networks: Data Filtering
A function between the user’s equipment and the RF transmitter to permit only necessary data traffic into the RF network.
Filter may not block all unwanted data
Filter is switch selectable
SRM6210E and SRM6310E
EthernetBridge
RFSection
Overrun
Error
LED
LAN Out
LED
Collision
LED
LAN In
LED
LAN Link
LED
Ethernet Data Out
T/R
Ethernet
RF Out
LED
RF In
LED
MACFilter
RF Link
LED
TransmitData
Receive Data
Ethernet Data In
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SRM Security
Reference Whitepaper Security Extends beyond RF Technology
Limit Access to radio equipment Secure and change radio configuration
Proprietary technology designed for security and reliability
Slaves cannot “listen in” to other slaves