hydrox@itsgw.rpi.edu (Michael A. Hendrix) (10/02/90)
Can anyone supply me the wiring pattern for a null modem cable with a DB25
connector on one end and a DB9 on the other end? I need to move some stuff
from my 286 to my laptop and need to wire a cable up for this....any help
would be greatly appreciated.
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***** Auto validation of WWIV sysops on first call *****kdq@demott.COM (Kevin D. Quitt) (10/03/90)
In article <='Q%5!=@rpi.edu> hydrox@itsgw.rpi.edu (Michael A. Hendrix) writes: >Can anyone supply me the wiring pattern for a null modem cable with a DB25 >connector on one end and a DB9 on the other end? I need to move some stuff >from my 286 to my laptop and need to wire a cable up for this....any help >would be greatly appreciated. DB9 RS232 DB25 RS232 Pin Signal Pin Signal 1 CD Carrier Detect 1 CGnd Case Ground 2 RxD Received Data 2 TxD 3 TxD Transmitted Data 3 RxD 4 DTR Data Terminal Ready 4 RTS 5 SGnd Signal Ground 5 CTS 6 DSR Data Set Ready 6 DSR 7 RTS Request to Send 7 SGnd 8 CTS Clear To Send 8 CD 9 RI Ring Indicator 9-19 Not usually used 20 DTR 21-25 Not usually used RS232C Null-Modem Cable DB9 DB25 DB25 DB9 Pin Pin Pin Pin 1 8 CD DTR 20 4 2 3 RxD TxD 2 3 3 2 TxD RxD 3 2 4 20 DTR DSR 6 6 4 20 DTR CD 8 1 5 7 SGnd SGnd 7 5 6 6 DSR DTR 20 4 7 4 RTS CTS 5 8 8 5 CTS RTS 4 7 1-6 6-8 6-8 1-6 <- Jumpers Note: If for some reason, you cannot jumper DSR to CD, connect DSR to the opposite DTR, and connect CD straight across (if possible). -- _ Kevin D. Quitt demott!kdq kdq@demott.com DeMott Electronics Co. 14707 Keswick St. Van Nuys, CA 91405-1266 VOICE (818) 988-4975 FAX (818) 997-1190 MODEM (818) 997-4496 PEP last 96.37% of all statistics are made up.
robin@uhccux.uhcc.Hawaii.Edu (Robin Amano) (10/03/90)
In article <='Q%5!=@rpi.edu> hydrox@itsgw.rpi.edu (Michael A. Hendrix) writes: >Can anyone supply me the wiring pattern for a null modem cable with a DB25 >connector on one end and a DB9 on the other end? I need to move some stuff >from my 286 to my laptop and need to wire a cable up for this....any help >would be greatly appreciated. DB25 DB9 2 TX -------------- 2 RX 3 RX -------------- 3 TX |- 4 RTS 7 RTS -| |- 5 CTS 8 CTS -| |- 6 DSR 1 DCD -| |- 8 DCD 4 DTR -| |- 20 DTR ------------ 6 DSR -| 7 GND ------------- 5 GND |- |- means jump together -- ------------------------------------------------------- Robin Amano | Internet: robin@uhunix.uhcc.hawaii.edu UHCC | robin@uhccux.uhcc.hawaii.edu 2565 The Mall | Honolulu, HI 96822
jc58+@andrew.cmu.edu (Johnny J. Chin) (10/04/90)
The best wiring for a "all-purpose" null-modem cable that I've found to
work in almost every application is as follows:
25pin 25pin
1 -------- 1
2 -------- 3
3 -------- 2
4 -------- 5
5 -------- 4
6,8 ------- 20
7 -------- 7
20 -------- 6,8
I hope this helps ...
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Disclaimer: The views expressed herein are STRICTLY my own, and not CMU's.