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Cables
First, you will need a serial port cable between the APC UPS and your computer running apcupsd. You can use either the cable that came with your UPS (the easiest if we support it) or you can make your own cable. We recommend that you obtain a supported cable directly from APC.

If you already have an APC cable, you can determine what kind it is by examining the flat sides of the two connectors where you will find the cable number embossed into the plastic. It is generally on one side of the male connector.

To make your own cable, first, you must know whether you have a Smart UPS that sends ASCII characters called Smart Signaling, or a "dumb" UPS that uses serial port line voltage signaling, called Simple Signaling.

The "dumb" UPSes are older models such as the BackUPS (not BackUPS Pro) and the ShareUPS Basic Port that use Simple Signaling. Most other UPSes use Smart Signaling. If in doubt consult the Configuration Section of this manual, or the documentation that came with your UPS.
Smart Signaling Cable for SmartUPSes
If you must build your own cable, and you have a Smart UPS, we recommend building the cable as follows:

SMART-CUSTOM CABLE

 Signal Computer                  UPS
         DB9F                     DB9M
   RxD    2   --------------------  2  TxD  Send
   TxD    3   --------------------  1  RxD  Receive
   GND    5   --------------------  9  Ground

Simple Signaling Cable for "dumb" UPSes
For "dumb" UPSes using Simple Signaling, if you are going to build your own cable, we recommend to do so as follows:

SIMPLE-CUSTOM CABLE
                 
 Signal Computer                  UPS
         DB9F   4.7K ohm          DB9M
   DTR    4   --[####]--*              DTR set to +5V by Apcupsd
                        |
   CTS    8   ----------*---------  5  Low Battery
   GND    5   --------------------  4  Ground
   DCD    1   --------------------  2  On Battery
   RTS    7   --------------------  1  Kill UPS Power

List of components one needs to make the Simple cable:

    One (1) male DB9 connector, use solder type connector only.
    One (1) female DB9/25F connector, use solder type connector only.
    One (1) 4.7K ohm 1/4 watt 5% resistor.
    resin core solder.
    three (3) to five (5) feet of 22AWG multi-stranded four or more conductor cable. 

- Solder the resistor into pin 4 of the female DB9 connector.