Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!uw-beaver!tektronix!uunet!portal!cup.portal.com!mhyman From: mhyman@cup.portal.com Newsgroups: comp.dcom.modems Subject: Re: Break definition Message-ID: <9206@cup.portal.com> Date: 17 Sep 88 21:34:29 GMT References: <402@ucrmath.UUCP> <248@lakart.UUCP> Organization: The Portal System (TM) Lines: 22 XPortal-User-Id: 1.1001.2549 In article <248@lakart.UUCP> dg@lakart.UUCP (David Goodenough) asks: > break a lot of things for me. For example I call in 7e1 to talk text > with lakart, but if I'm going to do an Xmodem transfer, I have to set > my end to 8n2 to get it to go. Now if the modem is hooked on the notion > of 7e1, I'm in real trouble. How are other people getting around this, ... At 300 bps the modem encodes 1 bit per baud; when the signal at the RS-232 port changes the modem sends a different frequency. That's why modems are rated 0-300 bps. At the higher frequencies multiple bits are encoded per baud. The modem needs to know the character size (but not the parity) so it may drop a stop bit when needed. The receiving modem needs to know the character size so it can tell when it has to insert a stop bit. Most modems these days assume a character size of 10 bits. If you look at a Smartmodem 2400 manual (page A25) you'll see that all supported Asynchronous data formats add up to 10 bit characters. --Marc Marco S. Hyman ...!sun!portal!cup.portal.com!mhyman mhyman@cup.portal.com