For dumb UPSes (such as RPT-800A REPOTEC) 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:
hi
my ups hawe pinout 5`2`4`6`7 db9 - its slight diferent from above sheme
https://networkupstools.org/cables.html#_tripp_lite
AND soft-app searhcing help me for non tx-rx com port ups soft
5+2 Shutdown load
5+4+8 Cable power (must be present for cable to have valid reading)
5+6 On line (no power failure) (opposite of OB - on battery)
5+7 Low battery
https://www.cyberpowersystems.com/products/software/
Quote:
Example Application
Supply 12VDC to the COMMON contact and connect LEDs to the DB-9
port pins 1, 2 and 6 to 9. Connect a push button to COMMON (Pin5) and
REMOTE SHUTDOWN (Pin4). Pressing the button for at least 5 seconds
will shutdown the UPS when it is on battery.
Note: When the UPS is on battery, the REMOTE SHUTDOWN input (Pin4
& Pin3) accepts at least 5 seconds of high level signal (+12VDC) to perform
the UPS shutdown. UPS output power will turn off after 120 seconds.
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The default communication speed for all UPSs is 1200 baud.
For some optional cards, the communication speed could by 9600 baud.