Connecting a APC USB UPS to either a PC USB or Serial Port . 131
Cables..................................131
Smart-Custom Cablefor SmartUPSes . . . . . . . . . . . . . 131
Smart SignallingCable for BackUPSCS Models . . . . . . . 132
Voltage-Signalling Cablefor ”dumb” UPSes . . . . . . . . . . 134
Other APCCables that apcupsdSupports . . . . . . . . . . . 136
Voltage Signalling Features Supported by Apcupsd for Various Cables137
Voltage Signalling . . . . . . . . . . . . . . . . . . . . . . . . 137
Back-UPS Office500 signals . . . . . . . . . . . . . . . . . . . 138
Analyses ofAPC Cables . . . . . . . . . . . . . . . . . . . . . 138
Win32 ImplementationRestrictions for SimpleUPSes . . . . 146
Internal ApcupsdActions for SimpleCables . . . . . . . . . . 146
RS232 Wiringand Signal Conventions . . . . . . . . . . . . . 148
Pin Assignment for the Serial Port (RS-232C), 25-pin and 9-pin, Female End148
Ioctl toRS232 Correspondence . . . . . . . . . . . . . . . . . 149
Testing Serial-Line UPSes . . . . . . . . . . . . . . . . . . . . . . . 149
Establishing SerialPort Connection . . . . . . . . . . . . . . 150
Using apcteston Serial-Line UPSses . . . . . . . . . . . . . . 153
Troubleshooting SerialLine communications . . . . . . . . . . . . . 155
Determining WhichVoltage-Signaling Cable You Have . . . . 155
Once youhave established serial communications . . . . . . . 155
Recalibrating theUPS Runtime . . . . . . . . . . . . . . . . . . . . 156
Status LoggingOn Serial-Line UPSes. . . . . . . . . . . . . . 157
DATALogging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Technical Reference . . . . . . . . . . . . . . . . . . . . . . . . . . 159
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