Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site unccvax.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!mcnc!unccvax!jsp From: jsp@unccvax.UUCP (Joel Patterson) Newsgroups: net.micro.mac Subject: Re: Mac-tty pinouts? Message-ID: <154@unccvax.UUCP> Date: Fri, 8-Mar-85 08:57:12 EST Article-I.D.: unccvax.154 Posted: Fri Mar 8 08:57:12 1985 Date-Received: Mon, 11-Mar-85 07:08:09 EST References: <2362@nsc.UUCP>, <16500011@ur-univax.UUCP> Organization: UNC-Charlotte Lines: 17 Most of the mac<->modem pinouts I have seen on the net have neglected DTR. Some modems require a high signal on pin 20 (DTR) in order to connect, answer the phone, or do anything but sit there. On some this is an option which can be switched off. In any case you must either turn the option off or strap DTR high. Most modems supply a constant high on pin 9 and jumpering it to pin 20 should do the trick. Pin 6 (DSR) may also be an alternate source for this signal. * Strapping DTR high also implies that the modem always thinks the mac is ready and waiting to communicate so it may answer your phone when you least expect it. This can be very annoying to sweethearts, customers, and bosses, since the modem usually answers on the first ring and you don't. So turn the modem off when not actually in use or awaiting calls. happy telecommunicating jsp