User Manual
R-32DIDO SERIES
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Doc: MI-00576-2-EN
Page 12
MODBUS PASSTHROUGH (ONLY R-32DIDO MODEL)
Thanks to the Modbus Passthrough function it is possible to extend the amount of I/O available in the device via
the RS485 port and the Modbus RTU slave protocol, for example by using the Seneca Z-PC series products.
In this mode the RS485 port stops working as Modbus RTU slave and the device becomes a Modbus TCP-IP
gateway to Modbus RTU serial:
Each Modbus TCP-IP request with station address other than that of the R series device is converted into a
serial packet on the RS485 and, in the case of a reply, it is turned over to TCP-IP.
Therefore, it is no longer necessary to purchase gateways to extend the I/O number or to connect already
available Modbus RTU I/O.