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9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the UPS
Part# M2501. Should work with RUPS for DOS/Windows software
The pinout should fit 1 devices/models. Click to list>
UPS
Signal Name		 DB-9 Male
(UPS end)		 DB-9 Female
(PC end)		 PC
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
at the computer
Pinout status: +3 -1
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
NO DIY devices
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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