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9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
APC part# 940-0128D
The pinout should fit 2 devices/models. Click to list>

940-0128D is functionally similar to the 940-0128A cable except for NC on (6) DTR and (2) RD on the computer side.

      RI(9)<---+
               |
     CTS(8)<---+--- E   2N2222(NPN)
                     |___
                ____ /| B |
               |    C     |
               |          |
               +---vvvv---+--[>|------<(2)OnBatt
     RTS(7)>---|    2k      1N5819
               +---vvvv---+--[>|------<(3)LowBatt
               |          |
               +--- C     |
                     |___|
                     /| B
     DCD(1)<------- E    2N2222(NPN)
     
     DTR(4)>-------------------------->(8)KillPwr
     
     GND(5)----------------------------(7)Signal GND
     (Shield)--------------------------(4)Chassis GND
 
10 pin RJ50 (10P10C) male connector layout
10 pin RJ50 (10P10C) male connector
at the UPS
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