4. Maintenance ................................................................................................................................... 25
4.1 Fan maintenance ...................................................................................................................... 25
4.2 Battery maintenance ................................................................................................................. 25
4.3 Visual checking ......................................................................................................................... 25
4.4 UPS status checking ................................................................................................................ 26
4.5 Function checking ..................................................................................................................... 26
5 Trouble shooting ............................................................................................................................ 26
Appendix 1. USB communication ................................................................................................. 28
Appendix 2. RS232 communication port definition .................................................................. 29
Appendix 3. Specification ................................................................................................................ 30
Appendix 4. Options ......................................................................................................................... 32
Appendix 5. UPS message table .................................................................................................... 33