Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site fritz.UUCP Path: utzoo!watmath!clyde!cbosgd!ihnp4!qantel!hplabs!felix!fritz!zemon From: zemon@fritz.UUCP (Art Zemon) Newsgroups: net.dcom,net.periphs Subject: Ringing RS-232 dilemma Message-ID: <4134@fritz.UUCP> Date: Tue, 12-Nov-85 15:53:02 EST Article-I.D.: fritz.4134 Posted: Tue Nov 12 15:53:02 1985 Date-Received: Thu, 14-Nov-85 08:04:22 EST Reply-To: zemon@fritz.UUCP (Art Zemon) Organization: FileNet Corp., Costa Mesa, CA Lines: 20 Xref: watmath net.dcom:1459 net.periphs:903 Sender: For various reasons I have a RS-232 line which is sometimes connected to another computer and sometimes left just hanging. When it is connected all is fine. When it is disconnected, the line "rings" and my VAX is inundated with ~1000 characters per second input. Poor Felix (the VAX) tries to echo all those characters and the poor human users complain about a certain lack of responsiveness. Is there some device which can be placed in the line to prevent the ringing but will not interfere with normal operation? We tried placing 10K resistors between pins 2 and 7 and between 3 and 7 but this didn't help. As an alternative, is there a passive device into which we can plug the line when it is disconnected from the computer? -- -- Art Zemon FileNet Corp. ...! {decvax, ihnp4, ucbvax} !trwrb!felix!zemon