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4. Computer and Alarm Connections
At the rear of the UPS is an interface that allows direct communication with a
computer system (see figure 2). There is a RS232 serial data interface, a USB data
interface, and an emergency power off switch. The RS232 port and the USB interface
cannot be used simultaneously.
In addition there is an optional interface slot that allows for the installation of
communications cards. It may be used in parallel with either the RS232 or USB
ports.
An SNMP/WEB card is available for the optional interface slot that allows for the
RemotEye II to manage and monitor the system over a network or over the internet.
RS-232 Standard Interface Port
Only the communication cable provided with the UPS may be used to connect the
UPS to a computer when using the RS232 port of the UPS. Ensure that the operating
system of the computer supports RS232 communications.
Other advanced power protection solutions, such as SNMP, are available from your
dealer.
The RS-232 interface uses a 9-pin D-sub connector. The names and functions of the
port pins are listed in the following table.
Pin # Signal Direction (re UPS) Functions
2TxD Output TxD Output
3RxD Input RxD / Inverter Off Input
5Common Common
6Output Ac Fail Output
8Output Low Battery Output
9Output 8–24 VDC Power
Table 1 : RS232 Pin Out Signal