irv@happym.UUCP (Irving [h] Wolfe) (09/26/90)
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? -- Irving Wolfe Happy Man Corp. irv@happym.wa.com 206/463-9399 ext.101 4410 SW Point Robinson Road, Vashon Island, WA 98070-7399 fax ext.116 SOLID VALUE, the investment letter for Benj. Graham's intelligent investors Information free (sample $10 check or credit card): email patty@happym.wa.com
fjs@nntp-server.caltech.edu (Fernando J. Selman) (09/26/90)
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
henry@zoo.toronto.edu (Henry Spencer) (09/27/90)
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). -- TCP/IP: handling tomorrow's loads today| Henry Spencer at U of Toronto Zoology OSI: handling yesterday's loads someday| henry@zoo.toronto.edu utzoo!henry