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MODBUS RTU connection on CAT 3516c with EMCP 3.3

Hello,

I have a new generator speced above, and need to make the MODBUS RTU connection, but cant find where to land the cable. I have the IOM, it has a terminal strip diagram with terminals, but doesnt give the location of the strip. I looked in the right side panel, where it seems all the terminal strips are, but didnt see exactly what I expected. I did find a connection labeled "modbus", except it already has wires landed on both sides of the terminal strip.and the wires seems to be connected to internal devices as far as I can tell.

Heres hoping someone can help.

Thanks in advance

Cat Dealer
Dealer

Re: MODBUS RTU connection on CAT 3516c with EMCP 3.3

Send pic please.

Super Contributor

Re: MODBUS RTU connection on CAT 3516c with EMCP 3.3

Gregory Poole has been nice enough to post the Application and Installation Guide for EMCP 3 controls here,

 

http://www.gregorypoole.com/SiteCollectionDocuments/EPG_AI_Guides/LEBE5255-01%20EMCP3%20Generator%20...

 

It has the wiring information you need to identify the Modbus connections at the EMCP connectors.

 

Mike L.

New member

Re: MODBUS RTU connection on CAT 3516c with EMCP 3.3

Has anyone used modbus to fiber optic and back to PC?

Super Contributor

Re: MODBUS RTU connection on CAT 3516c with EMCP 3.3

Yes, have used converters from this company was good success, http://www.antaira.com/products/serial-to-fiber

 

You need to limit how many times you go from copper to fiber media, as each transition adds latency, and can result in timeout errors. Depending on what you are actually doing it may be better to convert to Modbus TCPIP.

 

Hope that helps, MikeL.