Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!hp-pcd!hpfcso!hpfcdc!perry From: perry@hpfcdc.HP.COM (Perry Scott) Newsgroups: comp.sys.hp Subject: Re: modem(7) DTR question HELP! Message-ID: <5570575@hpfcdc.HP.COM> Date: 21 Feb 91 22:26:34 GMT References: <2757@maestro.htsa.aha.nl> Organization: HP Fort Collins, Co. Lines: 27 Re: modem(7) - what it REALLY says. In CCITT callin mode, the driver waits for Ring Indicate, then raises DTR (and CTS ? I'm foggy on that). When DSR and RTS comes up, the open() completes. In CCITT callout mode, the driver simply raises DTR, and waits for DSR and RTS. In SIMPLE mode, the driver raises DTR and waits for DSR, regardless of callin/callout bits. In CCITT mode, there are several timers that are activated. The one giving you problems is probably MTCONNECT, which defaults to 25 seconds. If you don't connect with that period of time, the open fails. I think this is because some modems actually take the phone off-hook when the computer raises DTR. Most phone companies frown on this, hence the existence of the timer. If you really want to disable the timer, set it to 0 with the MCSETT ioctl. Sorry you had to read the man page so many times. Sometimes I think the engineers run this company. :-) Perry Scott HP Ft. Collins, CO, USA Brought to you by Super Global Mega Corp .com