Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752761AbWLOPxZ (ORCPT ); Fri, 15 Dec 2006 10:53:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752763AbWLOPxY (ORCPT ); Fri, 15 Dec 2006 10:53:24 -0500 Received: from iriserv.iradimed.com ([69.44.168.233]:37889 "EHLO iradimed.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752761AbWLOPxY (ORCPT ); Fri, 15 Dec 2006 10:53:24 -0500 Message-ID: <4582C4FC.8040203@cfl.rr.com> Date: Fri, 15 Dec 2006 10:53:32 -0500 From: Phillip Susi User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Oliver Neukum CC: linux-kernel@vger.kernel.org Subject: Re: interface for modems with out of band signalling References: <200612151514.00390.oliver@neukum.org> In-Reply-To: <200612151514.00390.oliver@neukum.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 15 Dec 2006 15:53:33.0042 (UTC) FILETIME=[2C4BA520:01C72061] X-TM-AS-Product-Ver: SMEX-7.2.0.1122-3.6.1039-14874.003 X-TM-AS-Result: No--12.466900-5.000000-31 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 788 Lines: 19 Oliver Neukum wrote: > Hi, > > I have got a question about modems which use the AT command set, but > don't use in band signalling like true rs232 modems. Would two device nodes > per communication channel be a good interface? Huh? What do you mean "don't use in band signaling"? If you are asking how you issue AT commands to the modem while connected, you have to break to command mode. IIRC, this involves sending a special break character or two with the correct delay between them, or flipping one of the RS232 handshake lines. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/