B400R 1-3kVA User Manual
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10. Communication Port
10.1 RS-232 and USB communication ports
To establish communication between the UPS and a computer, connect the UPS via one of the
communication ports by using the appropriate communications cable (USB/RS232).
10.2 RS-232 port
The RS-232 port is available for UPS monitoring, control, and firmware updates. To establish
communication between the UPS and a computer, connect one end of the serial communication
cable that comes with the UPS to the RS-232 port on the UPS. Connect the other end of the serial
cable to the RS-232 port on a computer. The cable pins for the RS-232 communication port are
identified in the following table:
Pin
Signal Name
Function
Direction from the UPS
1
Unused
Not Applicable
2
Tx
Transmit to external device
Out
3
Rx
Receive from external device
In
4
Unused
Not Applicable
5
GND
Signal common (tied to chassis)
Not Applicable
6
Unused
Not Applicable
7
Unused
Not Applicable
8
Unused
Not Applicable
9
Unused
Not Applicable
10.3 USB port
The UPS can communicate with a USB-compliant computer by using HID-compatible power
management software. To establish communication between the UPS and a computer, connect the
USB cable that comes with the UPS to the USB port on the UPS and the USB port of a computer.
Note:
Only one of communication ports can be active at any one time. The USB Port has priority
over the RS-232 port. When a communication cable is installed, the power management
software can exchange data with the UPS. The software polls the UPS for detailed
information on the status of the power environment. If a mains fail occurs, the software
initiates the saving of all data and the orderly shutdown of the equipment