Als het goed is moet je deze pin layout gebruiken.
Computer Side | Description of Cable | UPS Side
DB9f | DB25f | | DB9m
4 | 20 | DTR (5vcc) | n/c
8 | 5 | CTS (low battery) | <- 5
2 | 3 | RxD (other on battery) | 3
5 | 7 | Ground (Signal) | 4
1 | 8 | CD (on battery from UPS) | <- 2
7 | 4 | RTS (kill UPS power) | -> 1
n/c | 1 | Frame/Case Gnd (optional) | 9
Note: the <- and -> indicate the signal direction.
Signal description:
CD, which apcupsd uses for the On Battery signal when high.
CTS, which apcupsd uses for the Battery Low signal when high.
DTR, which apcupsd sets when it detects a power failure
(generally 5 to 10 seconds after the CD signal goes high).
It clears this signal if the CD signal subsequently goes low
-- i.e. power is restored.
RTS, which apcupsd sets for the killpower signal -- to cause the UPS
to shut off the power.