RC schematics

[neoshaakti]

what is a RS485 driver ?
and this may sounds dumb, but does the power, ground and signal travel on the PCB itself?
and, do you recommend any literature that can teach me about microcontrollers? thank you

[Kevin Watson]

Originally Posted by neoshaakti

what is a RS485 driver ?
and this may sounds dumb, but does the power, ground and signal travel on the PCB itself?
and, do you recommend any literature that can teach me about microcontrollers? thank you

Actually, I believe it's RS422/EIA422.

-Kevin

[ebarker]

Originally Posted by Kevin Watson

Actually, I believe it's RS422/EIA422.

-Kevin

Oops, my bad. I meant to say RS422 or RS422/EIA422 to be picky.

For our listening audience RS485 is a close cousin. You can use a pair of RS422 circuits to implement a 'full-duplex' channel or use RS485 to implement a 'half-duplex' channel.

Since we are here:

RS232 is single ended, RS422 is differential. What does that get you? long distances and noise immunity. Very useful in the electrically noisy environment of a student built robot.

[Ziaholic]

Actually, the RS485 and RS422 standards are very similar protocols, but while RS422 has just a pair of devices on the bus (sender and receiver), an RS485 interface can support more than 2 devices on the bus ... so when a 485 device isn't sending, it puts its outputs into a Hi-Z state.