OPTI-UPS DS3000D(L) - Manual (Page 11)

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8. COMPUTER INTERFACE
8.1 Communication Interface
The communication interface (DB9 port) on the back of the UPS may be
connected to a host computer. The port provides RS-232 for monitoring
software (like 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.
8.2 DB9 PIN Assignment
The PIN 2: RS232 RXD, PIN 3: RS232 TXD, and PIN 5: GND. The other
PINs have no function.