> on other links such as over gsm, too. What about xmodem. Can I use this

XModem is horribly inefficient (78%). For file transfers, maybe ZModem
is what you want.

Jojo wrote:
> 
> I need a good protocol for error free communicating with my msp
> and a pc. It should be a software protocol (not RS232 with parity)
> because it should work on other links such as over gsm, too. What
> about xmodem. Can I use this protocol for communication, too? Can
> somebody help please?

Look up zmodem.

-- 
Chuck F (cbfalconer@yahoo.com) (cbfalconer@worldnet.att.net)
   Available for consulting/temporary embedded and systems.
   <http://cbfalconer.home.att.net>  USE worldnet address!

Jojo wrote:

> Hi NG,
> I need a good protocol for error free communicating with my msp and a pc. It
> should be a software protocol (not RS232 with parity) because it should work
> on other links such as over gsm, too. What about xmodem. Can I use this
> protocol for communication, too? Can somebody help please?

There are multiple choices. These choices differ in
blocksizes or streaming, compression or not,
forward errorcorrection, multipoint or master-slave
and so on.

Error correction is achieved by a CRC and retransmission.
If error spikes are expected, a forwarsd error correction
may lower the number of retransmissions.

Rene
-- 
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

Jojo wrote:
> Hi NG,
> I need a good protocol for error free communicating with my msp and a pc. It
> should be a software protocol (not RS232 with parity) because it should work
> on other links such as over gsm, too. What about xmodem. Can I use this
> protocol for communication, too? Can somebody help please?
> 
> Thanks,
> Joachim
> 
> 
TCP/IP I believe is supposed to be error free and is the basis for most 
communications these days. You can use PPP if using a Circuit Switched 
Data connection over GSM, or even direct with GPRS.

Hi NG,
I need a good protocol for error free communicating with my msp and a pc. It
should be a software protocol (not RS232 with parity) because it should work
on other links such as over gsm, too. What about xmodem. Can I use this
protocol for communication, too? Can somebody help please?

Thanks,
Joachim