Working on a RS485 IC circuit.
It is a point to point communication between two devices connected to each other via MAX485 IC and CAT6 Cable.
At 1 or 2 m length of cable, the data transfer seems fine. But above 5m the logic 0 transmission is not good. The logic 1 transmission is good.
Used Fail Safe Resistors of 10k/20k on the A & B Data lines. Also terminated the line with a 120 Ohm resistor.
Currently, I am just giving a logic 1 & logic 0 through the arduino. All common ground and other considerations checked. All fine. At 1 or 2m it works fine but above 5m the thing is not working reliably.
I just need to send some logic states over the cable. Data rate : about 10 bits per second. Length of cable requirements: 10m, 15m & 20m.
What can be done?