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The station will assert RTS before sending data out the port in order to key off a radio.
The station also drives DTR whenever Modbus is active.
19.2.3
Troubleshooting Modbus
If there are Modbus communications issues over RS-485 or RS-232, there are two potential causes:
The setup; Please make sure that the stations’ Modbus setup is t
he same as that of the client.
These settings must match: Protocol, Device ID, Baudrate, Parity, and the two Delay settings.
Wiring: Try reversing RS-485 A and B.
19.2.4
Modbus Server Over the Cell Modem
It is possible to access the station over the internet using Modbus. The station must be equipped with a
Cell modem to utilize this feature.
In this scenario, the IP address of the cell modem is used by the Modbus client to access the station. The
IP address can be found via LinkComm: it is displayed in the Telemetry tab's Status view.
The station will accept incoming connections using the Listen port setting on the Telemetry tab. The
default port is 3001.
Only the TCP/IP Modbus protocol may be used over Cell.
The station may only be a Modbus server over Cell.
19.3
Modbus Setup
To setup Modbus operation, please use the Other Setup tab of LinkComm. There are independent settings
for Modbus Server over the various ports.
To setup, the station as a Modbus client, in addition to configuring the settings in the Other Setup tab of
LinkComm, use the Measurement tab and choose Modbus as the Measurement Type.
Here is a list of general Modbus settings and their defaults:
Setting
Default
Modbus Cell Server Enable
Off
Modbus Rs485 Server Enable
On
Modbus Rs485 Server Device ID
1
Modbus Rs485 Server Delay before Tx 0 ms
Modbus Rs485 Server Delay after Tx 0 ms
Modbus Rs485 Protocol
RTU
Modbus Rs485 BaudRate
19200
Modbus Rs485 Parity
Even
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