Modbus


 

Hey Guys
I need to control a modbus device with a CP4, but the crestron's modules are not compatible with the series4
Has anyone  encountered this problem or have a module that works with series4 processors?
 
Thanks
Best Regards


 

Hi,
In what way are they incompatible?  The modbus processor module creates the checksum for any modbus command and should work with 4-series just fine.  You may need to swap the two checksum bytes though as the “endianness” is wrong.

If you can expand on where you’re hitting problems it’ll be easier to respond more fully.
 
All the best,
Oliver


 

Not an direct answer to your question but I have talk to modbus systems with a Raspberry Pi using the Python's pyModbusTCP library.  Modbus is a pretty simple protocol so I would think it would be pretty easy to write a module using just SIMPL/SIMPL+.


 

Do you mean the umc and usp are set to 2-series? Wouldn't be too hard to make them 4-series compatible.