pic microcontroller discussion list <> wrote on Wednesday, August 27, 2003
10:16 PM:

> Do any of the common serial communication handshaking schemes
> involve just the transmit and receive lines?
>
> I would like to get my two devices working "in harmony" and take
> turns transmitting.
>
> I would like to be able to use standard terminals and
> terminal emulators so I would like to stick to a standard format if
> one exists.

Have a look into MODBUS ASCII.  Unlike XON/XOFF and ACK/NAK schemes, you
can debug the whole protocol on an RS232 terminal, and you don't need
timeouts etc to take account of corrupted bits causing false XOFFs etc.

If you need a peer-to-peer system, you're probably better to use XON/XOFF
or similar, MODBUS is good for master-slave comms

Nigel
--
Nigel Orr, Design Engineer                 nigel@axoninstruments.co.uk
Axon Instruments Ltd., Wardes Road,Inverurie,Aberdeenshire,UK,AB51 3TT
               Tel:+44 1467 622332 Fax:+44 1467 625235
                   http://www.axoninstruments.co.uk

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