(me too)! Re: [Soekris] rs485 instead of rs232

[Henry Spencer]

On Fri, 2 Jul 2004, Chuck Yerkes wrote:
> So how do I chain 3 devices on RS-485 and reach them separately
> to gather data?

The answer is, unfortunately, that there's no standard for the protocols
used.  Depends entirely on the devices.

> When I've dealt with 485 (or IEEE488/GPIB, more which is similar
> enough in logic), it's been with canned APIs.

GPIB is specified in much more detail than 485 in this area.  485 is
purely an electrical spec -- it says nothing at all about addressing
conventions, packet formats, etc.

                                                          Henry Spencer
                                                       henry at spsystems.net