Re: rs485 question
I have tried the communication with two 200 meters & very thin cables (one of the cables are shorter than 200 meters), the communication didn't work properly. Rare messages come. Then I used 60 m. from the same cables for serial connection. Baud rate is 1200 for now. It seems working, I will increase the baud rate step by step.
I want to ask something about the resistor connections to the sn75176(I am using this ic for now, I will also try max487e). I have a master and one slave. In my circuit, between the A and B pins, there is a 1k of resistor, a 4,7k from A to +5V and 4,7k from B to ground. Do you think is that good, or should I make any corrections?
One more question. I want to apply some noise to the cables. How can I do it, do you have any suggestions?
Thank you very much.