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9 pin D-SUB male connector layout
9 pin D-SUB male connector
INT-0051 voltage signalling cable for UPS pinouts

 

UPS
Pin Number
UPS
Pin Name
Direction Computer
Pin Number
Computer
Pin Name
Description
n/a Shield -- n/a Shield Frame/Case Ground
1 Remote Shutdown <-- 7 RTS Kill UPS Power
3 Normally Open On-Battery Contact --> 8 CTS On Battery
4 Alternate Remote Shutdown <-- 3 TxD Alternate Kill UPS Power
5 Normally Open Low-Battery-Alarm Contact --> 1 DCD Low Battery
9 Signal Ground (Common) -- 5 GND Ground
  * <-- 4 DTR DTR set to +5V by software

* -- computer pin 4 (DTR) is connected to computer pin 1 (DCD) via the resistor 10k, and also it is connected to computer pin 8 (CTS) via the resistor 10k.







UPS (DB9M)                                          IBM PC (DB9F)
-----------                                         -------------
Shutdown     1 <------------------------------------------< 7 RTS
Alt Shutdown 4 <------------------------------------------< 3 TxD
Common       9 <------------------------------------------< 5 GND
PWR_FAIL     3 <---------------------------+--------------< 8 CTS
                                          [#] R1 10k
                                           +--------------< 4 DTR
                                          [#] R2 10k
LOW_BATT     5 <---------------------------+--------------< 1 DCD

 

 

9 pin D-SUB female connector layout
9 pin D-SUB female connector
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