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- From: malowany@cs.concordia.ca (Stephen Malowany)
- Newsgroups: comp.sys.sun.hardware
- Subject: How to survive a console terminal power-off?
- Keywords: console, terminal
- Message-ID: <C1HtA7.3p2@newsflash.concordia.ca>
- Date: 27 Jan 93 03:20:30 GMT
- Sender: usenet@newsflash.concordia.ca (USENET News System)
- Organization: Computer Science, Concordia University, Montreal, Quebec
- Lines: 51
- Nntp-Posting-Host: cyclops.cs.concordia.ca
-
-
- Is it possible to wire up the console serial port of a Sun server in
- such a way that:
-
- (1) the machine WILL NOT halt if the serial cable is
- unplugged at the terminal end.
- (2) the machine WILL halt in the presence of a software generated
- line break (e.g. via ioctl() calls).
- (3) the machine WILL NOT halt if the connected terminal is
- powered off.
-
- We have been able to achieve (1) and (2) so far with the following
- wiring, but not (3).
-
- Sun file Console
- Server Server
- Side Side
-
-
- 2 Tx ------------------------- ------------------------- 2 Tx
- \/
- /\
- 3 Rx ------+------------------ ------------------------- 3 Rx
- |
- Z 4.7K resistor
- |
- 25 -5v ------+ 25 -5v
-
- 7 GND ---------------------------------------------------- 7 GND
-
- 4 RTS --+ 4 RTS
- |
- 5 CTS --+ 5 CTS
-
- 6 DSR --+ 6 DSR
- |
- 20 DTR --+ 20 DTR
-
- (diagram from "conserver" software by K.S. Braunsdorf & T. Fine)
-
- We need this to work for the 3/160, 4/3X0, SS2, and SS10. If anyone can
- suggest to me a method for getting (1), (2), & (3) to work all at once,
- I would REALLY appreciate it! Oh, and ya, I know about UPS's, but that's
- just not in the cards right now.
-
- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
- Steve Malowany Systems Analyst
- Centre for Pattern Recogn. & Machine Intell. malowany@cenparmi.concordia.ca
- Department of Computer Science malowany@cs.concordia.ca
- Concordia University Montreal, Quebec, Canada
- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-