Modbus Serial To Ethernet; How It Works - Seneca R-KEY-LT User Manual

It's not possible to connect two Modbus serial slaves with the same Modbus address, if you need
to connect 2 Modbus RTU slaves with the same Modbus address (not configurable) you must use 2

MODBUS SERIAL TO ETHERNET

1.5.
In this scenario a Modbus serial master must be connect to one or multiple Modbus TCP-IP servers.
The Modbus serial master is connected with the serial port to the R-KEY-LT, one or more Modbus TCP-IP
servers are connected to the ethernet port:

HOW IT WORKS

1.5.1.
The Modbus serial to ethernet is the simplest way to create a communication between a serial master Modbus
device and one or more Modbus Ethernet TCP-IP server.
There is no need to configure which registers must be requested because the conversion from serial to
ethernet is executed in real time.
Only the serial configuration must be made (baud rate, parity etc...) and the server modbus station address
range (because one server can manage multiple station addresses).
The Master serial Modbus request a register from the RS232/RS485 port, then the R-KEY-LT convert the
request to the Modbus TCP-IP server, the Modbus TCP-IP server response is also retranslated in Modbus
serial to the Master.
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User Manual
R-KEY-LT devices.
www.seneca.it
Doc. MI004870-EN
Rev. 1.0.0.0
R-KEY-LT
Page 8