Hi,
I am using a Kinco PLC (type: KT506-24DT) the PLC has a terminal for A & B connections of the RS 485 communication.
All these time I have been using a third ground line along with the A & B lines in my earlier circuits. The ground line would be connected to ground via 120 Ohm resistor on both ends.
My question is should I run a ground line along with the other two lines A & B of the RS 485 communication ? If so should this be connected straight to ground or via a 120 Ohm resistor as mentioned above ??
At present I have left the ground line open, and PLC is communicating very well with an Anybus gateway in a lab environment with a short RS 485 line, but I am not sure how its going to perform in an high noise environment.
Please advise on the best way of connecting the ground line ??
thanks
a
I am using a Kinco PLC (type: KT506-24DT) the PLC has a terminal for A & B connections of the RS 485 communication.
All these time I have been using a third ground line along with the A & B lines in my earlier circuits. The ground line would be connected to ground via 120 Ohm resistor on both ends.
My question is should I run a ground line along with the other two lines A & B of the RS 485 communication ? If so should this be connected straight to ground or via a 120 Ohm resistor as mentioned above ??
At present I have left the ground line open, and PLC is communicating very well with an Anybus gateway in a lab environment with a short RS 485 line, but I am not sure how its going to perform in an high noise environment.
Please advise on the best way of connecting the ground line ??
thanks
a