Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 193
Radio Options
External radio support is a standard part of all 8310s. 8310s with the internal radio modem also
have additional radio support. The radio support provides the following functions:
transmit last measured data
transmit logged data
upload/download setup
recording on/off
set date/time
change slope and offset
store and forward message to another station
All communications with the 8310 are done using Sutron Standard Protocol (SSP) which insures
error free communications. The communications can be either with a base station or one of
Sutron's model 9000 field stations. Other 8310s can also be used as smart repeaters to forward
messages to other stations. Sutron has several software products that run on PCs to handle
communications.
Enabling External Radio Support
External radio support is enabled through the Setup/Communications menu.
Connecting To An External Rf Modem
Connect the external modem to the COM4 port of the 8310. The following diagram lists the
pinouts for the RS-232 port on the 8310. The connector is a DB9-female.
Pin 2,Txd Transmit data
Pin 3,Rxd Receive data
Pin 5,Gnd Ground
Pin 4,Dsr/Cts
Pin 6,Dtr/Rts
Pin 8,Dtr/Rts
Pins 6/8 are used for transmitter keying. When the 8310 is ready to send a message it will assert
DTR. When the message is completed DTR will be dropped. Pin 4 is used to detect incoming
messages and to prevent transmissions when another station is on the air. You should normally
wire pin 4 of the 8310 to the Carrier Detect (CD) line of the RF modem being used. The RF
modem must bring pin 4 high when carrier is detected. Incoming messages are treated as
terminal input. When characters appear on the data lines they are simply ingested. The 8310
will not initiate a transmission when Pin 4 is high. The 8310 operates in Carrier Sense Multiple
Access mode.
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