Xtreme Power Conversion Corporation
T90 User’s Manual
Page 22
Uninterruptible Power Supply
Computer And Alarm Connections
At the back of the UPS is an interface allowing direct communication with your computer system, the location of
which can be found in figure 2. There is a RS232 serial data interface, one USB data interface and an emergency
power off switch supplied. However, the RS232 port cannot be used when the USB interface is in use.
In addition there is an optional interface slot that allows you to install different communications cards. It can be
used parallel with either the RS232 or USB ports.
Currently there are two cards available for the optional interface slot. An SNMP/WEB card allows management and
monitoring over a network or internet, and the AS/400 card allows voltage free relay contacts. Your local dealer
will have more information about these option cards.
Connecting the UPS to a Computer
The communication device for the UPS and PC comes as a complete package with power management software.
Only the communication cable provided with UPS may be used to connect to your computer, which is accom
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plished through the UPS RS232 port. Also ensure that the operating system on your computer is supported. In
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structions provided in the power management software will help with this installation.
Other advanced power protection solutions such as SNMP are provided by your dealer.
RS-232 Standard Interface Port
The RS-232 interface uses a 9-pin female D-sub connector. This information consists of data about utility, load and
the UPS. The interface port pins and their functions are identified in the following table.
Pin #
Signal name
Direction (re UPS)
Functions
2
TxD
Output
TxD Output
3
RxD
Input
RxD / Inverter Off Input
5
Common
Common
6
Output
Ac Fail Output
8
Output
Low Battery Output
9
Output
12 VDC Power
Caution! Max rated values 12Vdc
