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Connecting a APC USB UPS to either a PC USB or Serial Port . 131
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Smart-Custom Cable for SmartUPSes . . . . . . . . . . . . . 131
Smart Signalling Cable for BackUPS CS Models . . . . . . . 132
Voltage-Signalling Cable for ”dumb” UPSes . . . . . . . . . . 134
Other APC Cables that apcupsd Supports . . . . . . . . . . . 136
Voltage Signalling Features Supported by Apcupsd for Various Cables137
Voltage Signalling . . . . . . . . . . . . . . . . . . . . . . . . 137
Back-UPS Office 500 signals . . . . . . . . . . . . . . . . . . . 138
Analyses of APC Cables . . . . . . . . . . . . . . . . . . . . . 138
Win32 Implementation Restrictions for Simple UPSes . . . . 146
Internal Apcupsd Actions for Simple Cables . . . . . . . . . . 146
RS232 Wiring and Signal Conventions . . . . . . . . . . . . . 148
Pin Assignment for the Serial Port (RS-232C), 25-pin and 9-pin, Female End148
Ioctl to RS232 Correspondence . . . . . . . . . . . . . . . . . 149
Testing Serial-Line UPSes . . . . . . . . . . . . . . . . . . . . . . . 149
Establishing Serial Port Connection . . . . . . . . . . . . . . 150
Using apctest on Serial-Line UPSses . . . . . . . . . . . . . . 153
Troubleshooting Serial Line communications . . . . . . . . . . . . . 155
Determining Which Voltage-Signaling Cable You Have . . . . 155
Once you have established serial communications . . . . . . . 155
Recalibrating the UPS Runtime . . . . . . . . . . . . . . . . . . . . 156
Status Logging On Serial-Line UPSes . . . . . . . . . . . . . . 157
DATA Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Technical Reference . . . . . . . . . . . . . . . . . . . . . . . . . . 159
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