In RS485 communication, what is the role of termination resisotor.
Is it mandatory?
I have been working on a project with MODBUS/TCP over RS485 where upto 32 slaves are there in some links, out of 300 links am testing. One of a problem i came across is, in most of the cases when there is a termination resistor, there is a problem in establishing a communication with the slaves. But as soon as i remove this resistor communication is back.
Now if it is mandatory, then can anyone help me find a solution, what i can do to resolve this termination problem. I have tried google and all answers but not getting a suitable answer.