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RTU Conguration Parameters
Model Number The model of the RTU being congured is selected and shown here.
Protocol The protocol selection for the radio communications port (COM1). Options include Micro-Comm RTU32,
DF1 Half-Duplex Slave, DF1 Half-Duplex Master, DF1 Full-Duplex, DF1 Radio Modem, Modbus RTU
Slave, Modbus RTU Master or Modbus/TCP.
Baud Rate This selects the speed for the radio communications port (COM1). 110, 300, 600, 1200, 2400, 4800,
9600, 19200, 38400, 57600 and 115200 bps are supported.
Parity Parity checking mode (Even, Odd or None).
Data Bits The number of data bits used by the radio port (5, 6, 7 or 8).
Stop Bits The number of stop bits used by the radio port (1 or 2).
PTT Time in milliseconds that will occur after the radio is keyed and before the data is sent out the radio port.
This should normally be set to 250 msec or more for Micro-Comm RTU communications using conven-
tional radios. Data radios will allow for much lower PTT times (50 msec or less).
Enable Modem When this option is checked, the RTU will turn on the internal 600 (or 110) baud radio modem. Leave
this box un-checked when using an external radio modem. Note: The S4500 and M1500 RTUs do not
have hardware support for this option. Only M550 and later RTUs.
Ant. Outputs The range of 8 discrete outputs to use when a remote is doing Antenna/Radio switching. RTU32 proto-
col can only specify an 8 bit mask so this selection allows it to be applied to outputs 1-8 or 9-16.
Ant. Default Discrete ouput number to leave on for Radio #1 when doing Antenna/Radio switching at a remote.
Station # For use with Modbus or DF1 protocols ONLY. This sets the station # for this RTU as used by the proto-
col on all of the communication ports.
SCode For use with Micro-Comm RTU32 protocols ONLY. This sets the “System Code” for this RTU that the
central must use in order to communicate with us. The central system code is selected in the message
function (MSB of station address = 1-8). This can help to isolate systems on the same frequency from
each other. Usually this will be set to “None”.
COM2 Protocol Communication protocol used on COM2. This can be Micro-Comm Display, Micro-Comm RTU32,
Micro-Comm CTU32, DF1 Half-Duplex Slave or Master, DF1 Full-Duplex, DF1 Radio Modem, Modbus
RTU Slave or Master, Modbus/TCP or Web Server.
COM2 Baud This selects the speed for the COM2 port.
The default is 9600 baud for compatibility with the Micro-Comm Display Module.
COM2 PTT Time in msecs that will pass after RTS is turned on and before data is sent out COM2.
The default is 0 which will leave the RTS turned on all the time.
COM3 Protocol Communication protocol used on COM3. This can be Micro-Comm I/O, DF1 Half-Duplex Slave or
Master, DF1 Full-Duplex, DF1 Radio Modem, Modbus RTU Slave or Master, Modbus/TCP, Micro-Comm
Display, Micro-Comm RTU32 or Micro-Comm CTU32.
COM3 Baud Communications speed for the Micro-Comm I/O modules or for Modbus RTU / DF1 communication.
The default is 9600 baud.
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