Trust Energy Protector 325, User Manual, Page: 20 / 20

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Appendix B:
Computer Interface Port (525)
D type 9 pin connector
Provides both RS-232 and relay signal. UPS can send power
failure and battery low signals to the PC and receive shutdown
signal and scheduled on/off time table from the PC.
Figure 6 D type 9 pin connector
1. contacts normally open
2. signal high minimal 1 second
3. low battery
4. mains failure
5. ground
6. UPS shutdown or RS-232 TD pin 3
7. RS-232 RD pin 2
8. RS-232 RTS pin 7
9. RS-232 DTR pin 4
10. no connection
11. pin number