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SETUP
Page 54
DOC_DEV_XS_Setup guide_C
16.2
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
16.2.1
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
.
16.2.2
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 product.
Select the Modbus Client gateway to connect a serial Master device to the serial port of the product.
16.2.3
Assigning a Modbus gateway to a serial port
The Modbus client gateway (respectively server) can be assigned to the serial port COM1 or COM2.
The Modbus client gateway can be assigned to a serial port (COM1 for ex.) while the Modbus server gateway
is assigned to the other port (COM2 for ex.).
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