Hi all,
it's my first post but I guess not least as I have a project to do using my Unitronics V1210 with CANOpen and 2 ports for Modbus RTU on board.
I want to establish basic communication with my VFD (Vacon 100 / now Danfoss company) by Modbus RTU.
1. I bought RJ11 six pin plug and prepare junction so I have two cables - yellow at PIN1 and red at PIN6.
2. I connected PLC (Port 1) to VFD (A,B inputs)
3. I wrote a basic program to read the register 2101 (which is not 0 for sure) and... nothing happens. No communication.
What I have checked:
- Ports termination (set to RS485