Comunication via modbus

[Olivera 0]

Hello: I have three power meters: PM 500 (merlin gerin), PM 710 (Merlin gerin) and CVMk-L (Circutor). I want to connect them to a Controllogix CPU L5561 with a modbus network (MVI56-MCM Prosoft). I connected the two merlin gerin. I don't be able to connect the circutor power meter. Anybody knows how can I get connect the circutor to the PLC via modbus with the MVI56-MCM? Thanks

[Ken Moore 23]

I would call ProSoft, their tech support is very good. They've always been able to help get over the hard spots. What protocol are you using RS-422 or 485? Is each device on a different channel or all on the same. What have you tried so far? Are the devices slaves or masters? Which flavor of Modbus RTU, ASCII? Have you read the device manuals? What's different about the one unit?