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Weidmuller Wireless Ethernet Modem & Device Server WI-MOD-E-G/A User Manual
Modbus TCP to RTU Gateway
Client
Access Point
The Modbus TCP to RTU Gateway allows an Ethernet
Modbus/TCP Client (Master) to communicate with a serial Modbus
RS232
Modbus TCP
RTU Slave. The WI-MOD-E makes this possible by internally
to RTU
Gateway
performing the necessary protocol conversion. The conversion is
always performed by the WI-MOD-E which is directly connected to
the Modbus serial device (i.e. only this module needs to have
LAN
Modbus TCP to RTU Gateway enabled).
RS232
Modbus RTU
Modbus TCP
Slave
Client (Master)
The above example demonstrates how a Modbus/TCP Client (Master) can connect to one or more Modbus RTU (i.e
serial) Slaves. In this example the WI-MOD-E Access Point is configured with the "RS232 Modbus/TCP to RTU Gateway"
enabled. Once enabled, the gateway converts the Modbus/TCP queries received from the Master into Modbus RTU
queries and forwards these over the RS232 port to the Slave. When the serial response to the query arrives from the
Slave, it is converted to a Modbus/TCP response and forwarded via the network to the Modbus/TCP Master. If no
response was received serially by the WI-MOD-E within the configured Response Timeout, the WI-MOD-E will initiate a
number of retries specified by the configured Maximum Request Retries.
The Modbus TCP to RTU Gateway may be configured to operate on either the RS-232 or RS-485 port.
Rev. 2.16
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