This is the situation now.
I have the T100MD connected to the VFD.
I have setup a function (1st scan) to change the port #3 to 19,200 8,2,n (setbaud 3,14) to match the VFD.
I have another dCfn to read the parameter 105
DM[1]=READMODBUS (13,1,105).
I change the ID=2 on the PLC, the VFD ID=1.
I am suppose to receive 50 on DM[1], i have no answer from the VFD.
I disconnect the cable from the VFD, if I check the voltage on the plc port is 2.1v and when the function is activated, the voltage change to -1.5v and go back to 2.1v. That may show that the port is sending the signal, I don't know.
On the VFD cable I have 2.57v (disconnected from the PLC). When I connect the VFD to PLC port, the voltage is 2.4 and also when the function is activated, the voltage changes.
What am i doing wrong and have no communication?
Thanks,
Philip