IPL ROUTER SET-UP
Ethernet ADSL Cellular Routeur Firewall
Setup Guide 9023409-01
Page 69
18.2
Modbus gateway
The modbus gateway allows to connect serial RS232-RS485 master or slaves devices to one or several
Modbus TCP devices connected to the IP network.
Remark :
Several ETIC router models provides two serial ports; one Modbus client gateway can be assigned to the port
1 and a Modbus client gateway to the port 2 using both the 502 TCP port.
But a Modbus client (resp. server) gateway can be assigned to both serial ports only if the gateways do not
use the same TCP port number.
18.2.1
Glossary
A Modbus TCP client
is a device connected to the Ethernet network and able to transmit Modbus requests
to a Modbus TCP server device which will reply.
Several Modbus clients can send requests to the same Modbus TCP server.
A Modbus TCP server
is a device connected to the Ethernet network and able to reply to Modbus requests
to a coming from Modbus TCP client devices.
A TCP server can reply to several TCP clients.
A Modbus master device
is a device connected to a serial asynchronous link and able to send requests to a
Modbus slave device connected to the same serial network.
A Modbus slave device
is a device connected to a serial asynchronous link and able to reply to Modbus
requests connected to the same serial network.
Modbus address :
An address between 0 and 254 assigned to each participant to a modbus network.
Remark the Modbus address must not be confused with the IP address of a Modbus device
18.2.2
Selecting a Modbus client or a Modbus server gateway
•
Select the Modbus Server gateway to connect serial slave devices to the serial port of the ETIC router.
•
Select the Modbus Client gateway to connect a serial Master device to the serial port of the ETIC
router.