In conclusion, the Modbus 2-channel 5V relay module is a very useful device for making something Modbus compatible. I found the module relatively straightforward to use, and it seems to do a good job ...

The MB-Gateway is a single port Modbus Gateway module that converts Modbus TCP to Modbus RTU. The gateway module features an automatic read function and is equipped with one RJ45 10/100 Mbps Ethernet ...

MB-GATEWAY, a single-port Modbus Gateway module, converts Modbus TCP to Modbus RTU.

MVI56E Modbus TCP/IP Multi-Client Enhanced Communication Modules ... Modbus Module Handles Multiple Devices. Aug. 4, 2010. MVI56E Modbus TCP/IP Multi-Client Enhanced Communication Modules ...

The two Universal Modbus modules connect CompactLogix controllers to any Modbus/TCP or Modbus serial networks from the same module, even at the same time.