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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