Hi @Martin-Kudláček first, thanks for ur reply. Am trying to read data from Omron CQM1. Here's a screenshot of the configuration in CX-programmer.

when i set mode operation to RUN and switch on qModMaster for Modbus, i always get timeout error.

Am a little bit confused about hostlink protocol OR modbus ...

@sacirovic Hi, Have figure out a solution on how to read data sent from Omron using serial line ??
i'am connecting PLC to my laptop and i'am using windows 10 system. Do i need to a driver or something else to read data or sent request to omron Plc ??

i have set a variable on Omron memory to DM200 address, and i want to read this variable on node red.
i have put all the necessary configuration (parity, baude rate, .. ) in serial node and modbus-Read node but i have nothing received on msg debug node.
So, i wonder if i set variable address wich is DM200 ,in my case, to be able to receive data on node-red ????