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That answer depends on what are you trying to troubleshoot. Describe devices involved in communication, network between them and other details that might be helpful.

It is irrelevant to talk about compatibility between Modbus (DNP3, CompoNet, PLCLink or any other protocol) and Moxa (or any other interface). Moxa and others are electrical interfaces and completely don't care what data they are transmitting/receiving. The only differences between devices wiil...

First and foremost - you need to start making distinction between protocol and transport mediums. Modbus in any variant is a protocol, meaning it is a set of rules of what each bit in a message mean. And those messages are transmitted over a medium - Ethernet, RS232, RS422, RS485 fiber, etc...

I'm late to the party, but some might find it useful. Green - 24VDC OK, Yellow for Overload. Looks like you could have encountered short-circuit or ground-fault on 24VDC side. A few flashes possibly are the result of short-circuit protection kicking in, then retrying to supply voltage again...