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'[PIC]:RS485 or something better'
2002\06\06@164135 by Micro Eng

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I've had an idea for a while. Think others have solved some of the problem
but checking..

Say i have a string of sensors, using one of the 8pin PIC's.  Three of the
I/O ports are being used to monitor the sensors...

I have say....100 of these units in a string, each 6" or so apart.
Comm methods.  Is RS485 the best way to go? Or has someone else been
successfull in using some one-wire multidrop method.  I know...RS485 is not
the method...just the medium for it.  I dont need anything really fast, but
somewhat robust and cheap of course.  Oh...only will be transmitting on this
part of the circuit, so no need to worry about bidirectional or collisions.
The rx side of the sensor transmitter is totally different.


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2002\06\07@032148 by Peter L. Peres

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On Thu, 6 Jun 2002, Micro Eng wrote:

>I've had an idea for a while. Think others have solved some of the problem
>but checking..
>
>Say i have a string of sensors, using one of the 8pin PIC's.  Three of the
>I/O ports are being used to monitor the sensors...
>
>I have say....100 of these units in a string, each 6" or so apart.
>Comm methods.  Is RS485 the best way to go? Or has someone else been
>successfull in using some one-wire multidrop method.  I know...RS485 is not
>the method...just the medium for it.  I dont need anything really fast, but
>somewhat robust and cheap of course.  Oh...only will be transmitting on this
>part of the circuit, so no need to worry about bidirectional or collisions.
>The rx side of the sensor transmitter is totally different.

I have used a modbus-like protocol like this, with up to 10 hot-pluggable
peripherals. Sony LANC control uses this system at 9600Bauds afaik. I used
1200Bauds. The line has (active) pullups and the drivers are o.c. or o.d.
I don't know about 600" but with 50V line level and up to 4800B you could
use POTS wiring up to about 20 miles or so ;-).

Peter

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