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Modbus / Re: Mach modbus inteface info?

« on: December 12, 2009, 04:16:47 PM »

Hi Peter

It is like that. But how do you get Mach to talk like that? When I put a port sniifer on what Mach outputs and use the test routine all that I can seem to get is:

1 byte slave address
1 byte function
2 bytes start address
n bytes data
then 1 byte = number of registers if its a read
2 bytes CRC

What I seem to be getting hung up on is how to configure modbus without all the extra bits.

I'm toying with the idea to create a plugin (not sure if thats the right way or not) but would prefer to just output bog standard modbus strings. You shouldn't need a hardware translator.

Can you point me in the right direction to learn how to config mach this way? I've read and watched the tutorials but thay all seem to be directed to setting up for your board or PLC that likes all the extra stuff.


Cheers

Mark

Edit:
I just looked over everything and I've been reading the posts wrong, ignore me.