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Rj45 male to db9 male cable for ups

Hello,

I just need to build a cable whose one ends connect to ups( DB9 female rs232 port) & the other one to pc (rj45 8pin male connector).

any help should be appreciated....

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  • Carl Navarro
    Carl Navarro May 11, 2010

    Do you think you might need to post the brand of UPS since the pinouts might be different?



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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 (three 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 | | RJ45 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 --------------------------------------

Posted on Oct 24, 2008

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