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Date: Sun 25-Sep-1990 21:55:02 From: Unknown Subject: RS-423 on new machines -- What is it? What's RS-423? I've used RS-232 for nearby serial devices and RS-422 for terminals 700 feet from the computer, but what is this RS-423 that the new NeXT machines have, and what can it be interfaced to? Article 8111 of comp.sys.next: >From: fjs@nntp-server.caltech.edu (Fernando J. Selman)
Date: Sun 26-Sep-1990 12:21:34 From: Unknown Subject: Re: RS-423 on new machines -- What is it? irv@happym.UUCP (Irving [h] Wolfe) writes: >What's RS-423? I've used RS-232 for nearby serial devices and RS-422 for >terminals 700 feet from the computer, but what is this RS-423 that the new >NeXT machines have, and what can it be interfaced to? >-- > [stuff deleted] >From the latest Horowitz and Hill, page 727: RS-232 RS-423A RS-422A ====== ======= ======= Mode single-ended single-ended differential Maximun Number Drivers 1 1 1 Receivers 1 10 10 Maximun Cable Length 15m 1200m 1200m Maximun Data Rate(bit/s) 20k 100k 10M Transmit Levels +-5V min +-3.6V min +-2V min +-15V max +-6.0V max (diff'l) etc. Fernando Article 8145 of comp.sys.next: >From: henry@zoo.toronto.edu (Henry Spencer)
Date: Sun 26-Sep-1990 22:30:03 From: Unknown Subject: Re: RS-423 on new machines -- What is it? In article <688@happym.UUCP> irv@happym.UUCP (Irving [h] Wolfe) writes: >What's RS-423? I've used RS-232 for nearby serial devices and RS-422 for >terminals 700 feet from the computer, but what is this RS-423 that the new >NeXT machines have, and what can it be interfaced to? RS-423 is sort of a sexier RS-232, easier to deal with electrically and capable of rather higher speeds than a standard-conforming RS-232 (many RS-232 implementations play fast and loose with the standard). It is generally compatible with RS-232 if you don't push hard (no long cables, no K-Mart-price PC-market devices that save $1.95 by implementing only a vague approximation to RS-232, no connectors made out of bobby pins). Article 8104 of comp.sys.next: >From: cnh5730@calvin.tamu.edu (Chuck Herrick)
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