Gents - hope somebody can help out, I've been tasked with fixing an OLD SCADA system. I've got an S7-226 PLC thats configured for Modbus comms via PORT 0 (on the PLC). I can see that in the PLC and the baud rate setup etc.
On the other end at the PC I have a USB to 422/485 converter - I can't for the life of me find a cable diagram on the internet, does anybody have a pinout diagram to connect from 422/485 to the 9 pin PLC connector ?
On the 422/485 converter there are 4 pins (well 5 - one for ground) TD-, TD+, RD-, RD+.
Thanks in advance.
Russ
On the other end at the PC I have a USB to 422/485 converter - I can't for the life of me find a cable diagram on the internet, does anybody have a pinout diagram to connect from 422/485 to the 9 pin PLC connector ?
On the 422/485 converter there are 4 pins (well 5 - one for ground) TD-, TD+, RD-, RD+.
Thanks in advance.
Russ