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If you want to copy a "standard" way of doing this look at how
Paroscientific uses multiple RS232 sensors in a single sensor loop.  I
have attached a link to one of their manuals.  If you cant get it, go to
www.paroscientific.com and look for the manual for digiquartz sensors.

Sherpa Doug

> -----Original Message-----
> From: Byron A Jeff [mailto:byron@CC.GATECH.EDU]
> Sent: Monday, July 02, 2001 5:21 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC] RS232 BUS ?
>
>
> On Mon, Jul 02, 2001 at 09:37:19PM +0200, Patrick J wrote:
> > Hi, I am investigating the possibillity to have 4 PIC
> 16F877 connected
> > to the same PC on a RS232 'bus'.
> > I am using MAX220CPE, can they be connected in parallell or
> will they go
> > up in flames ?
>
> Yes. RS-232 is point to point. If you want a bus
> configuration you should
> take a look at RS-485.
>
> If you really want RS-232, instead of using a bus
> configuration, instead
> wire in a ring. So instead of:
>
>    +------------+-------------+------------+----------------+ <- RS232
>    |            |             |            |                |
> -------      -------       -------      -------         -------
> | PC  |      |Node1|       |Node2|      |Node3|         |Node4|
> -------      -------       -------      -------         -------
>
> Do this:
>
> -------      -------       -------      -------         -------
> | PC  |----->|Node1|------>|Node2|----->|Node3|-------->|Node4|--v
> -------      -------       -------      -------         -------  |
>   ^                                                              |
>   +--------------------------------------------------------------+
>
> Where the PC talks to Node 1, Node 1 to Node 2, and so forth.
>
> It will be slower than the bus, but works with the technology.
>
> BAJ
>
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>
>

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