Smart Power Systems SSP UPS - Manual (Page 38)

35
6. BATTERY REPLACEMENT
7. Slide the new batteries into EBM.
8. Reconnect the battery cable and screw the battery bracket.
9. Close and reinstall the front panel back to EBM.
7. COMMUNICATION PORT
7.1 RS232 + Dry contact (750/1000/1500/2000/3000VA):
DB9 Female (RS232 +dry contact)
7.2 USB port: HID protocol
The USB and RS232 are unable to operate at the same time. Either the USB
or DB9 can connect with RS-232 at one time, usually connecting with USB
function is priority.
PIN # Description I/O Function Explanation
1 DCD Output Low Battery Output
(*normally open, pull to
Pin# 5 when battery low
alarm in battery mode)
2 RxD Output RxD
3 TxD Input TxD
4
5 Common --
6 DSR Output
7 RTS Input No connection
8
(tied to pin 6) Input DTR
Common (tied to chassis)
(tied to pin 4)
AC Fail Output
(*normally open, pull to
Pin#5 when UPS is in
battery mode). Output CTS