OPTI-UPS PS7500DL - Manual (Page 17)

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9. COMPUTER INTERFACE
9.1 communication interface
The communication interface (DB9 port) on the back of the UPS may be
connected to a host computer. The port provides communication of
RS-232 for monitoring software (like RUPSII or UPSilon 2000 of Megatec
Company)
The UPS communicates with the computer by sending out RS-232 data
streams to one of the serial ports. By this method the user is able to monitor the
following parameters.
Input Voltage
Indicates the present input voltage to the UPS system
when AC power is present.
Output Voltage Indicates the present output voltage of the UPS.
AC Frequency Indicates the actual output frequency of the UPS.
Battery Voltage Indicates the present DC voltage of the UPS battery.
Temperature Indicates the actual temperature inside the UPS.
9.2 DB9 PIN Assignment
PIN 2: RS232 RXD
PIN 3: RS232 TXD
PIN 5: GND
The other PINs have no function.
DB9 INTERFACE CONNECTOR
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10. SPECIFICATION