Hardware pinouts information and cables schemes

APC BackUPS Pro PNP cable pinout

connector or cable wiring

bookmark this page

APC part # 940-0095A



     UPS end                                      Computer end
     -------                                      ------------
                       47k        47k
     BATTERY-LOW (5) >----R1----*----R2----*----< DTR,DSR,CTS (4,6,8)
                              |          |
                              |          |
                              |         /  E
                              |       |/
                              |    B  |
                              *-------|  2N3906 PNP
                                      |
                                      |\
                                        \  C
                                         |
                                         |
                                         *----< DCD (1)     Low Batt
                                         |
                                         |
                                         R 4.7k
                                         3
                                         |
                                  4.7k   |
     SHUTDOWN (1)    >----------*----R4----*----< TxD (3)
                              |
                              |  1N4148
                              *----K|---------< RTS (7)      Shutdown
     
     POWER-FAIL (2)  >--------------------------< RxD,RI (2,9) On Batt
     
     GROUND (4,9)    >--------------------------< GND (5)

DTR is "cable power" and must be held at SPACE. DSR or CTS may be used as a loopback input to determine if the cable is plugged in. DCD is the "battery low" signal to the computer. A SPACE on this line means the battery is low. This is signalled by BATTERY-LOW being pulled down (it is probably open circuit normally).

TxD must be held at MARK; this is the default state when no data is being transmitted. This sets the default bias for both DCD and SHUTDOWN. If this line is an open circuit, then when BATTERY-LOW is signalled, SHUTDOWN will be automatically signalled; this would be true if the cable were plugged in to the UPS and not the computer, or if the computer were turned off.

RTS is the "shutdown" signal from the computer. A SPACE on this line tells the UPS to shut down.

RxD and RI are both the "power-fail" signals to the computer. A MARK on this line means the power has failed.

SPACE is a positive voltage, typically +12V. MARK is a negative voltage, typically -12V. Linux appears to translate SPACE to a 1 and MARK to a 0.


This information should be correct, but may be not. Please, help us to improve this document!
Is this document CORRECT or INCORRECT? Your opinion will be used to establish document status (showed at the bottom).
Pinouts.ru > GPS, UPS, Switches and other devices cables and adapters schematics >  Pinout of APC BackUPS Pro PNP cable and layout of 9 pin D-SUB female connector and 9 pin D-SUB male connector
Document status: unknown
Source(s) of this and additional information: www.apcupsd.com
Contributor: obtained by Chris Hanson
0 reports
Last updated at Thu Jan 10 2008. Submit additions or corrections for this document. Is this document correct or incorrect? What is your opinion?
[Discuss at the forum] [Back to index] [SUBMIT new pinout]
This page contain parts under Copyright © 2000-2007 by pinouts.ru team.
No any portion of this webpage may be reproduced in any form without visible direct link to this page provided. Webmaster permission required in any other cases.
Efforts have been made to ensure this page is correct, but it is the responsibility of the user to verify the data is correct for their application.
72 hits since January 11, 2008