6. COMMUNICATION INTERFACE
The UPS provides two computer interfaces, smart software (RS-232) and USB (optional).
The RS-232 also includes dry contact (DB-9, optional) for different monitoring application.
The models with USB interface are applying the same control port for both USB & RS-232 so
that the only interface can be used at the same time.
6.1 The definition and setup for RS-232 is shown as follows:
Baud Rate : 2400 dps
Data Length : 8 bits
Stop Bit
: 1 bit
Parity :
None
5 4 3 2 1
9 8 7 6
Pin #6 : RS-232 data Tx out.
Pin #7 : Common of Pin #6 and Pin #9
Pin #9 : RS-232 data Rx In
6.2 The definition and setup for DB9 (optional) is shown as follows:
Pin #2 : AC Power Failure
Pin #4 : Common GND of Pin #2 & Pin #5
Pin #5 : UPS Battery Low
Pin #6 : Turn off UPS
Pin #7 : GND of Pin6
The interface with computer is diagramed as above for your reference. Use Pin #4 as the
common of Pin #2 and Pin #5, Pin #2 and Pin #4 will become close loop from open when the utility
fails, Pin #5 and Pin #4 will become close loop from open when the battery level is low.
The UPS will shut down itself when the high level from RS-232, sustained for 3 seconds, which is
applied between Pin #6 and Pin #7.
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