User`s guide

SET UP
XSRING+ SHDSL switch User’s guide ref 9018809-01 Page 55
17.1.2 “Modbus client” gateway
That gateway can be used only if a serial modbus master device is connected to the serial interface of
the XSRING+.
That modbus master can send requests to slaves connected to the serial interface or to up to 256
modbus TCP servers connected to the IP network (i.e. modbus slaves).
To configure the modbus client gateway,
• select the modbus menu and then “modbus client” menu;
• enable the “modbus client” gateway and set up the parameters as follows :
“ASCII / RTU protocol” parameter :
Select the right option
“Inter-character gap” parameter :
Set up the maximum delay the gateway will have to wait between a received character of a modbus
answer frame and the following character of the same frame.
“TCP inactivity Timeout” parameter :
Set the time the gateway will wait before disconnecting the TCP link if no characters are detected.
“TCP port number” parameter :
Set the TCP port number the gateway has to use.
“IP address table” :
When the serial master sends a modbus request to a slave, it includes the modbus address of that
slave.
If that slave is not a serial slave but a TCP modbus server on the ethernet network, the ETIC gateway
needs to know what is its IP address.
That IP address table allows to assign an IP address to each modbus slave address.
• To assign an IP address to each modbus slave device with which the serial master device needs to
communicate, click the “add a link” button; Assign an IP address in front of each modbus slave
address with which the serial master device will have to communicate.
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