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'[EE]: A five-to-one RS 232 - cruncher - anyone ?'
2001\04\11@164843 by Robert Francisco

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----- Original Message -----
From: "MILTON MEDICINTEKNIK KB" <spam_OUTmilton.medicinteknikTakeThisOuTspamTELIA.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Wednesday, April 11, 2001 3:12 PM
Subject: [EE] A five-to-one RS 232 - cruncher - anyone ?


Hello,

A question: 5 different devices use RS 232 as a communication protocol
to/from a controller (or PC). I need to combine those lines to ONE RS 232
line.

One way to do it is to use 3 PIC's with dual ports (or 6 single port PIC's)
or makbe "bit-bang" data, make up a que, and let one port become the
"compressed" data stream further down the line.

however...

O have tried to find a commerciallay available box that is doing this magic
tric - and almost suceeded. I don't have time to design the thing, and
wonder if anyone out there know where I can buy one :=)

NOTE: It must be a separate box. A multiple RS 232 comm card to a PC doesn't
count.

Any hint appreciated. Thank you.


Sven in Sweden

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2001\04\11@170657 by David VanHorn

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>
>A question: 5 different devices use RS 232 as a communication protocol
>to/from a controller (or PC). I need to combine those lines to ONE RS 232
>line.
>
>One way to do it is to use 3 PIC's with dual ports (or 6 single port PIC's)
>or makbe "bit-bang" data, make up a que, and let one port become the
>"compressed" data stream further down the line.

I've done this in the AVR, with Max 3100 uarts for the ports.
Workable, but somewhat complicated.
It may end up commercially available in the near future.
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