| Pin # | Signal Type | Function |
| 1 | Basic Modem Mode;
Input: RS232 high pulse 4 to 5 seconds wide | Remote UPS off: In presence of AC, Output will turn off for 15 seconds after conditionaldelay. In absence of AC, output is kept off until normal AC returns |
| 1 | Serial Data Mode;
Input: RS232 data | RS232 serial communication input. 1200 baud, 8-bit, no parity, one stop bit, one start bit, Xon/Xoff |
| 2 | Basic Mode;
Output: RS232 level high | AC Input failure |
| 2 | Serial Data Mode;
Output: RS232 data | RS232 serial communication output. Same as input |
| 3 | Output: Open collector transistor ON, 50 mA. 40 VDC rating | AC Input failure |
| 4 | Signal Common | Signal Common |
| 5 | Output: Open collector transistor ON. SO mA. 40 VDC rating | Impending low battery |
| 6 | Input: RS232 level low (-12V) | Plug and Play software enable trigger |
| 7 | Input: Relay contact or RS232 level | Remote output OFF/ON: UPS total output can be kept off with low signal or closing relay contact |
| 8 | Output: 8 to 25 VDC, 5 W constant power (0.63 A max. @ 8V) | Auxiliary Control Power |
| 9 | Chassis | Connection to chassis |
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