Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 180
repeating is the hop-delay. Each hop requires time to receive and then retransmit the message.
At 1200 baud it may take 10 extra seconds per hop for a long message. Ack delays and response
timeouts must be increased proportionally.
An 8310 automatically replies using whatever source the message originated from including all
the repeating stations. If you want the 8310 to originate an alarm message using the store and
forward capabilities, you must add the names of the repeating stations to the PROTOCOL
SETUP/MASTER ID.
Cross device repeating allows a message to be received on one device and repeated out
another. This could be from one radio to another or even from a telephone modem to a radio. A
radio in the first 8310 card slot would be using device AUX:, a radio in the second slot would use
COM:, an external radio connected to the RS-232 port would use TERM:. The syntax for sending
a message to site C reachable thru site B’s radio in the first slot would be: B_AUX:C (read this as
to site B repeated out AUX: to site C).
Under SSP a repeater will never attempt to retry a message, it is the responsibility of either the
source or the destination to attempt retries.
Use MODBUS with the 8310
The 8310 supports both Modbus Slave and Modbus Master operation.
Modbus slaves are configured from the Station Setup – Communications menu. The menu
reference for serial slave operation is defined in the Station Setup/Communications/COMx
MODBUS menu. The menu reference for TCP/IP slave operation is defined in the Station
Setup/Communications/ MODBUSTCP menu. Modbus registers are defined within the 8310 by
assigning a register number to an output. See the Measurements/Ox/MODBUS menu reference
for details.
Modbus masters are implemented in the 8310 using the MBSensor input type, and the MBOut
measurement type. The MBSensor input type is used to read values from a Modbus slave
device. The MBOut measurement type is used to write values into a Modbus slave device.
Reserved Modbus Registers
Holding registers in the range 1001 –1099 (4:01001 to 4:01099) have been reserved for the
purpose of setting and getting 8310 state data, and for controlling the operation of the 8310.
The following table identifies the actions that occur when reserved registers 1001 – 1099 are
read or written.
Returns hour in range
0 – 23.
Sets hour. Use range
0 – 23.
Returns minute in
range 0 – 59.
Sets minute. Use
range 0 – 59.
Returns second in
range 0 – 59.
Sets second. Use
range 0 – 59.
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