Multiplex signals and cameras?

[Robert]

Hi all,

I need to combine several analog signals (DC voltage swing from 0V to 12VDC,
from switches, relays, etc.) and send it to another device using
multiplexing.

I first need to find more information regarding multiplexing. I am hoping I
can find a way to send bi-directional signals through 3 wires (Hi, Low,
Shield).

But I have two cameras that need to be implemented into my design (just two
CCD cameras that monitor a machine). But the signal from the camera goes
back to the unit sending the multiplexed signal!

Right now, I have 16 wires sending signal between both devices.

I need to simplify, ideally, 3 wire multiplex would be best.

(Concert lighting uses "DMX" which has 512 channels of control, interesting
stuff indeed. But I don't think I've seen bi-directional DMX in that
industry).

I guess the camera signal would have to be converted to digital (it has
composite outputs).

Oh, and if anyone has any information where I can find multiplexing
information, that would be greatly appreciated (information leading me
towards design).

Cheers!

Robert

 

[CWatters]

I need to simplify, ideally, 3 wire multiplex would be best.

How about 3 wires....

1) 0V/screen
2) Composite video from camera
3) Multiplexed data

2 and 3 go in opposite directions.

3 could be bidirectional

Google "1 wire signaling" to do 3) perhaps?
Hint.. http://www.webster-dictionary.org/definition/1-Wire

If you want to be clever synchronise the data to the video to reduce noise
on the video signal.