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9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
10 pin RJ50 (10P10C) male connector layout
10 pin RJ50 (10P10C) male connector
at the UPS
Pinout compatibility:
  • APC Back-UPS BE350C
  • APC Back-UPS BE500C
  • APC Back-UPS ES 550
original 940-0128A and analogue of the 940-0128A for APC Back-UPS ES "C" BE350C, BE500C, ES 550

If you have a BackUPS CS, you are probably either using it with the USB cable that is supplied or with the 940-0128A supplied by APC, which permits running the UPS in dumb mode. By building your own cable, you can now run the BackUPS CS models (and perhaps also the ES models) using smart signalling and have all the same information that is available as running it in USB mode.

The jack in the UPS may be easily use a 8 pin RJ45 connector. It is easy to construct the cable by cutting off one end of a standard RJ45-8 ethernet cable and wiring the other end (four wires) into a standard DB9F female serial port connector.

PC Signal PC pin UPS Pin UPS signal
RxD 2 2 TxD
TxD 3 8 RxD
GND 5 7 Ground
FG Shield 4 Frame Ground

Though these UPSes are USB UPSes, APC supplies a serial cable (typically with a green DB9 F connector) that has 940-0128A stamped into one side of the plastic serial port connector.





 

Here is suggested scheme of original 940-0128A cable

APC Part# - 940-0128A

     computer      --------- Inside the Connector---------  UPS
     DB9-F         |                                     |  RJ50
     pin - signal  |                                     |  Pin - Color
                   |                                     |
      4     DSR  ->|---+                                 |
                   |   |  diode   resistor               |
      6     DTR  ->|---+---->|------///-----o kill power |  8  Orange
                   |                                     |
      1     DCD  <-|----+                                |
                   |    |                                |
      2     RxD  <-|----+----------------+--o low battery|  3  Brown
                   |                     |               |
      7     RTS  ->|-------------+--///--+               |
                   |             |                       |
                   |             +--///--+               |
                   |                     |               |
      8     RI   <-|----+----------------+--o on battery |  2  Black
                   |    |                                |
      9     CTS  <-|----+                                |
                   |                         signal      |
      5     GND  --|------------------------o ground     |  7  Red
                   |                                     |
      3     TxD    |                                     |
                   |                         chassis     |
      Chassis/GND  |------------------------o ground     |  4  Black
                   |                                     |
                   |          Not connected              |  1, 5, 6, 9, 10
                   --------------------------------------








 

----------------------------------------------------

UPS  RJ50

Pin 1 -  USB +5V

Pin2  - On Battery

Pin3 -  LoBatt (NOT)

Pin4,7 - GND

Pin8 - Shutdown

Pin9 -  USB D-

Pin10- USB D+

For making DYI USB cable simply cut USB cable and connect Red wire to Pin1 of RJ50, Black to pin 7, White to pin 9 and Green to pin 10.

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PinoutsGuide.com > UPS devices > Pinout of APC BackUPS CS/ES smart signalling cable and layout of 9 pin D-SUB female connector and 10 pin RJ50 (10P10C) male connector
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