|1||Frame Ground||Frame/case ground.|
|3||Remote Shutdown||If a positive signal level (+5V to +12V DC) is applied for at least 1 seconds, while the UPS is operating on battery, shuts the UPS off after 120 seconds.|
|4||Normally Closed On-Battery Contact||A normally closed contact that opens (releases from Common) after the UPS switches to battery power.|
|5||Signal Ground (Common)||The signal ground for all signal pins.|
|7||Normally Open Low-Battery-Alarm Contact||A normally open contact that closes (pulls to Common) during a Low Battery Alarm.|
|9||Normally Open On-Battery Contact||A normally open contact that closes (pulls to Common) after the UPS switches to battery power.|
Contacts consist of open collector circuits capable of switching up to +30 VDC, 6 mA resistive load.
Note: for additional information how to connect this UPS to the computer, please look APCUPSD Voltage Signalling Simple-Custom Cable for MGE Pulsar EL 7.