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EIA RS-485 is a serial communication standard using differential signaling.

6
votes
5answers
Does anyone know of a good circuit that would automatically enable the transmit on an RS-485 driver when characters are transmitted? In our designs we currently use RTS to drive the driver transmit p …
asked Apr 16 '13 by fred basset
2
votes
2answers
I'm testing an RS-485 comms network that is having occasional problems. Looking at the waveforms on the scope it looks like fairly bad overshoot and undershoot of the voltage levels at signal edges. …
asked Nov 18 '11 by fred basset
4
votes
1answer
My current workplace has made some custom cables that have conductors for DC power and conductors for for RS-485 communications in the same bundle. My predecessor apparently had the cables measured to …
asked May 23 '12 by fred basset
4
votes
4answers
I've only ever used RS-485 over short connections before. I may have a project coming up where the cables will run several 1000 ft. My questions are: Is the gnd wire needed? Should the shield in t …
asked Oct 3 '11 by fred basset
13
votes
3answers
I've noticed my experiments in the lab with RS-485 work fine with fairly short cables, but termination resistors are needed for true installations. Is their presence or absence a function of the cabl …
asked May 17 '12 by fred basset
2
votes
1answer
I'm examining an RS-485 driver circuit that uses what look like Zener diodes between D+ and gnd and D- and gnd. Anode is connected to gnd, cathode to the D+ or D-. So in this arrangement the idea is …
asked Nov 1 '11 by fred basset
0
votes
3answers
I'm working on a new customized motor controller system I've inherited. The system has a heirarchy of controllers - a PC communicates to an RS-485 serial bus of one level of controllers, and each one …
asked Apr 26 '12 by fred basset