Modbus RS485 to C Bus

Hi all.
I have a C Bus project that we are installing Merlin Gerin power logic meters PM9C into.The power meters have a modbus RS485 outlet.
How possible is it to intergrate the both together.Eg if the value of amps
go above a preset level C Bus must turn off loads.

Many thanks,

Choppa.

 

i do know that MG do also have a device that will convert the modbus485 to modbus TCP, as for getting this to c-bus no idea.

But now that clipsal is a schneider electric company, and they (schneider) were the founders of the modbus protocol.... maybe just maybe, but i doubt it.

There was also talk of an OPC server for c-bus this may help out....


A whole lot of meaninless crap, but i hope you get somewhere...


Cheers

Grant

 

hi

what's target to integration between PM to cbus ?

who is master ? cbus or modbus ?
only for reading or any logical output ?

thanks

rgds
vincent

 

Modbus RTU or ASCII?

A PAC may be able to do it - I have no reall experience with PAC's and the language invoved. It may be trivial to with with Modbus RTU in the PAC and it may be near impossible (you will need an RS485/RS232 adapter)

But if it were me I would go get a ClickPLC from Automation direct (~$100 for CPU with 8 input and 6 output). They support Modbus on the serial port (RS232 & an optional 485 port) and then use the locig controller in the PLC to do the logic and control.

The PLC can then send out a text string on the second serial port to a PAC and the PAC can read it and do whatever you deem necessary, or you can go low level and use DO's on the PLC and use a aux in module and have that do load control.

You can start to pass in other inputs to the PLC as well if you find you want/need to like a light sensor.

I currently use my ClickPLC with my power meters counting the wh pulses and EOI pulse and calculating the power usage every interval. (Three meters in total - Domesting, Solar and Off-Peak).

Sorry, not much of an answer but hopefully some leads for you to follow up on.

 

You can try Cool4M: http://coolautomation.com/products/coolink/cool4m/

It translates ModBus to simple RS232 ASCII strings (go to Documentation section to see the protocol)

 

if it is more than $100 then the ClickPLC will be a cheaper option.