APC UPS control system - Manual (Page 140)

Voltage-Signalling Cable for “dumb” UPSes
NOTE. YOU DO NOT HAVE THIS CABLE UNLESS YOU
BUILT IT YOURSELF. THE SIMPLE-CUSTOM CABLE IS
NOT AN APC PRODUCT.
For “dumb” UPSes using voltage signalling, if you are going to build your
own cable, we recommend to make the cable designed by the apcupsd team
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:
1. One (1) male DB9 connector, use solder type connector only.
2. One (1) female DB9/25F connector, use solder type connector only.
3. One (1) 4.7K ohm 1/4 watt 5% resistor.
4. resin core solder.
5. three (3) to five (5) feet of 22AWG multi-stranded four or more con-
ductor cable.
1. Solder the resistor into pin 4 of the female DB9 connector.
2. Next bend the resistor so that it connects to pin 8 of the female DB9
connector.
3. Pin 8 on the female connector is also wired to pin 5 on the male DB9
connector. Solder both ends.
4. Solder the other pins, pin 5 on the female DB9 to pin 4 on the male
connector; pin 1 on the female connector to pin 2 on the male connec-
tor; and pin 7 on the female connector to pin 1 on the male connector.
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