APC SU1400XLT User Manual download pdf (Page 80)

Contributed

by:

Lazar M. Fleysher

Although we do not know what the black box semiconductor contains, we believe that we understand its

operation (many thanks to Lazar M. Fleysher for working this out).

This cable can only be used on voltage-signalling UPSes, and provides the On Battery signal as well as

kill UPS power. Most recent evidence (Lazar's analysis) indicates that this cable under the right conditions

may provide the Low Battery signal. This is yet to be confirmed.

This diagram is for informational purposes and may not be complete. We don't recommend that use it to

build you build one yourself.

APC Part# - 940-0020B

Signal Computer UPS

DB9F DB9M

CTS 8 -------------------- 2 On Battery

DTR 4 -------------------- 1 Kill power

GND 5 ---------------*---- 4 Ground

--- *---- 9 Common

DCD 1 ----|///|----------- 5 Low Battery

|\\\|

RTS 7 ----|///| (probably a

--- semi-conductor)

940-0020C Cable Wiring

Supported

Models:

Simple Signaling such as BackUPS

This cable can only be used on voltage-signalling UPSes, and provides the On Battery signal, the Low

Battery signal as well as kill UPS power. You may specify UPSCABLE 940-0020C.

This diagram is for informational purposes and may not be complete. We don't recommend that use it to

build you build one yourself.

APC Part# - 940-0020C

Signal Computer UPS

DB9F DB9M

CTS 8 -------------------- 2 On Battery

DTR 4 -------------------- 1 Kill power

GND 5 ---------------*---- 4 Ground

*---- 9 Common

RTS 7 -----[ 93.5K ohm ]----- 5 Low Battery

or semi-conductor

940-0023A Cable Wiring

Supported

Models:

Simple Signaling such as BackUPS

This cable can only be used on voltage-signalling UPSes, and apparently only provides the On Battery

signal. As a consequence, this cable is pretty much useless, and we recommend that you find a better

cable because all APC UPSes support more than just On Battery. Please note that we are not sure the

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APC SU1400XLT User Manual Page 80

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