User Documentation

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8. Typical Applications
8.1 Ethernet Master (TCP) with multiple serial Slaves (RTU)
Application:
The Modbus TCP Master is connected to the Ethernet network running Modbus TCP protocol.
Serial Modbus devices  running as RTU slaves - are connected to the Ethernet network via the
Modbus TCP/RTU Gateway.
On Ethernet-side the Modbus Gateway supports up to 16 simultaneous master connections (means
16 Modbus TCP Masters).
The serial interface supports both RS-232 and RS-422/485 connections, configurable by software
configuration. At a time only one connector may be used. Either connect one RS-232 serial device
(Peer-to-Peer) via DB9 connector or use the terminal block to connect one RS-422 serial device
(Peer-to-Peer) or up to 31 RS-485 serial devices (bus structure).