Honeywell RM7890A Burner Control

[TimWilborne 108]

This is a continuation of THIS topic I was reading in the installation instructions of the RM7890A and noticed it has a DH-485 port. I have searched Honeywells site and can find no specifications on it. Does anyone know anything about how you could communicate with it and what information you can get from the RM7890A over it?

[Steve Bailey 118]

DH485??? Are you sure? It wouldn't surprise me to find an RS-485 port that could communicate via some Honeywell protocol or possibly Modbus, but DH485 is a proprietary Rockwell protocol.

[TimWilborne 108]

Typo. Meant RS485

[rlp122 4]

I think this might be what you are referring to. See pages 5-8. Edited 6 Jun 2006 by rlp122

[TimWilborne 108]

That looks like it. Thanks TW