Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site teneron.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!mtuxo!mtunh!mtung!mtunf!ariel!vax135!cornell!uw-beaver!tektronix!reed!nsc-pdc!teneron!joey From: joey@teneron.UUCP (Joey Pruett) Newsgroups: net.dcom Subject: Asynchronous data slippage Message-ID: <183@teneron.UUCP> Date: Mon, 24-Jun-85 15:27:40 EDT Article-I.D.: teneron.183 Posted: Mon Jun 24 15:27:40 1985 Date-Received: Thu, 27-Jun-85 07:58:34 EDT Reply-To: joey@teneron.UUCP (Joey Pruett) Organization: Teneron Corp., Beaverton, OR Lines: 28 Summary: Hollow: I am currently working on a device that sits between a modem (DCE) and a terminal/computer (DTE) and processes the data going in both directions. The problem I am experiencing is characters being dropped from the data stream when sending continuous data (at any baud rate). I placed the UARTs I am using (Signetics 2661) into remote loopback mode (the incoming data is immediately transferred from the reciever shift register into the transmitter holding register) and discovered the same problem. I think I have tracked the source to a baud rate clock that is slightly slow (about 0.006% off), but everybody indicates that asynchronous communications have tolerances around 0.5%. With continuous data coming into the device at 9600 baud, the output will drop one character approximately every 3.8 seconds. Does anybody out there have any ideas or suggestions for what I can do about this problem? Is it a problem at all, or does all async communication have this problem? Any and all comments appreciated, Joe Pruett Teneron Corporation 6700 SW 105th Suite 200 Beaverton, Oregon 97005 (503)646-1599