APC SU1400XLT User Manual download pdf (Page 84)

6 DTR -> 6 --+---->|----/\/\/\---o kill power

1 DCD <- 1 --+

2 RxD <- 2 --+----------------+--o low battery

7 RTS -> 7 --------+--/\/\/\--+

+--/\/\/\--+

8 RI <- 8 --+----------------+--o on battery

9 CTS <- 9 --+

5 GND --- 5 ----------------------o ground

3 TxD 3 nc

940-0128A Cable Wiring

Supported

Models:

Older USB BackUPS ES and CS

Contributed

by:

Many, thanks to all for your help!

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. The other end of

the cable is a 10 pin RJ45 connector that plugs into the UPS (thanks to Dean Waldow for sending a

cable!). Apcupsd version 3.8.5 and later supports this cable when specified as { UPSCABLE 940-0128A}

and { UPSTYPE dumb}. However, running in this mode much of the information that would be available in

USB mode is lost. In addition, when apcupsd attempts to instruct the UPS to kill the power, it begins

cycling about 4 times a second between battery and line. The solution to the problem (thanks to Tom

Suzda) is to unplug the UPS and while it is still chattering, press the power button (on the front of the unit)

until the unit beeps and the chattering stops. After that the UPS should behave normally and power down

1-2 minutes after requested to do so.

Thanks to all the people who have helped test this and have provided information on the cable wiring, our

best guess for the cable schematic is the following:

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 ->|----------+--/\/\/\--+ |

| | |

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 114 115

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APC SU1400XLT User Manual Page 84