W4K as modbus RTU sniffer?

[AEK]

I've a modbus RTU setup - 4 salves + 1 master. I know all the device IDs, used registers...
I'd like to visualize some of the raw data. Unfortunately the modbus master has no API for querying raw data. Due to this, I'd like to use me W4K as modbus sniffer. Has someone done something like this already? Or any better idea?

what is your general task?  if you want to see raw data jnce - then it is better to use USB-RS485 adapter and Modbus Poll software (it has bus monitor)