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9 pin D-SUB male connector layout
9 pin D-SUB male connector
Part# M2501. Should work with RUPS for DOS/Windows software
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
Signal Name
AC Fail 2 8 CTS, connected by R 1k8 to pin 7(RTS)
Batt Low 5 1 DCD, connected by R 1k8 to pin 8 (CTS). Connected by R 1k8 to pin 7(RTS)
Shutdown 6 R=10k, 4 DTR
Common 4,7 3 TxD
9 pin D-SUB female connector layout
9 pin D-SUB female connector
According to 4 reports in our database (3 positive and 1 negative) the Sendon UPS-500 dumb cable pinout should be correct.

Is this pinout
Sendon UPS-500 dumb cable visual pinout:click to enlarge
Source(s) of this and additional information: UPS FAQ in russian
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