Circuit Modem 7510 de SGS-THOMSON

Modems CML Microcircuits ultra-faible consommation

http://w1.nnx.com/comprendre/cmdmodem.htm Envoi de commande au Modem

http://www.lohri.net/PDFTelecom/HAYES.pdf Hayes - commandes Hayes

http://www.conexant.com/products/imaging-smart/embedded-modem/ Embedded Modem Conexant.

http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm brochages pour connecter un modem

http://web.archive.org/web/20070930203513/http://www.eicon.com/support/helpweb/spd2en/at.asp Commandes AT en général

http://web.archive.org/web/20060614232443/http://www.columbia.edu/acis/networks/protocols.html Vitesses et protocoles


Modem AT-command questions..


> Anybody knows how to stop a modem from data mode to command mode and then hung it up? I've tried +++ then wait for one second, followed by ath then one second, and then at+chup.. but they're not stoping my modem..

It's possible the +++ chars were reset. I seem to remember that you could tell the modem to use other chars besides '+' to escape "data mode". It's
been a long time though since I've cared thanks to cable modems. You have to wait before the +++ too. So stop the data, wait the required
delay, which van be longer than 1 second, send +++ and wait again. After that you should see 'OK' appear and be able to hangup with 'ATH'.

Try an initial wait of over 2 seconds before the "+++". Or simply drop the DTR line.


You have to wait 0.5 sec before +++ then wait for OK before you send ath. Another methode is dropping DTR for about 0.5 secs.

 

GSM


introduction, principe et histoire de la téléphonie cellulaire: http://www.iec.org/online/tutorials/gsm/

toutes les spécifications du gsm (en francais), crosslist (ou cherchez?) de la 3ggp (www.3ggp.org) http://perso.wanadoo.fr/cell.sys/recs_fr.htm

pour de l'info plus généraliste (grand public), l'inévitable "cellular news" http://www.cellular-news.com/

et en cadeau bonus, la page de liens inévitables sur la toile: http://www.valtanen.com/e/gsm/links/

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12 octobre, 2014

email: matthieu.benoit@free.fr