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[Technical Inquiry] Modbus Master on RS485 with Digital Outputs

Modbus Master on RS485 with Digital Outputs

I have a small application, which is actually getting complex because it’s so simple… We have a control system which is out of I/O and we can’t program it any further. However, it does have a Modbus RTU Slave accessible on RS485. So I’m looking for a Modbus RS485 Master that has 4 x digital outputs. What would be the simplest implementation of this? I just need to give it 4 discrete input register addresses and have it drive 4 relay outputs. The PAC seems overkill and has a very large footprint for such a small requirement.

Thanks for your help!


The ADAM-6750 with node-RED. It can be a master.


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