APC UPS control system - Manual (Page 146)

940-0023A Cable Wiring:
This diagram is for informational purposes and may not be complete, we
don’t recommend that use it to build you build one yourself. 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 following
diagram is correct.
APC Part# - 940-0023A
Signal Computer UPS
DB9F DB9M
DCD 1 -------------------- 2 On Battery
3.3K ohm
TxD 3 --[####]-*
|
DTR 4 ---------*
GND 5 ---------------*---- 4 Ground
|
*----
9 Common
940-0095A Cable Wiring:
This is the definitive wiring diagram for the 940-0095A cable submitted by
Chris Hanson <cph at zurich.ai.mit.edu>, who disassembled the original
cable, destroying it in the process. He then built one from his diagram and
it works perfectly.
Construction and operation of the APC #940-0095A cable.
This cable is included with the APC Back-UPS Pro PNP series.
UPS end Computer end
------- ------------
47k 47k
BATTERY-LOW (5) >----R1----*----R2----*----< DTR,DSR,CTS (4,6,8)
| |
| |
| / E
| |/
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