Power Inspired VFI10KT, User Manual, Page: 24 / 34

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Appendix 1 Signals options
RS232 serial port
The VFI-KT units are fitted with a standard RS232 serial port, which can be used to:
■ Monitor the UPS power status
■ Monitor the UPS alarm information
■ Monitor the UPS running parameters
■ Perform a battery test
To enable RS232 control:
1. Connect the UPS to your computer using the supplied RS232 cable.
2. Load the supplied software onto your computer.
Connections between computer and UPS RS232 ports
Computer UPS
RDX 2 ← TX 3
TDX 3 → RX 2
GND 5 GND 5
RS232 communication data format
Parameter Value
Baud rate 2400 bps
Byte length 8bit
End bit 1bit
Parity check Null
Contact closure (basic monitoring and control)
The VFI-KT units may have a contact closure option.
This provides access to a set of dry contacts
giving you basic monitoring and control functionality.
The signal connections are as follows:
Pin number Function
1 battery low signal
2 signal common (0 V)
4 a.c. fail signal
9 turn off signal (apply +5 V to +12 Vd.c. for 2 s)
Figure 6 DB9 socket pin-outs
looking at the socket on the UPS
Figure 5 RS232 serial port pin-outs
looking at the socket on the UPS
VFI-KT Series User Manual