User`s manual

D:\manual\UM_PCM-ULT\ML_Ult3k\661-UT3K-002-31.doc

KEVIN KU 第 19 頁 2003/3/4

5.4 The pin of computer interface port

The pin of computer interface port has the following characteristics:

5.4.1. Pin 5 and 2 are open collector outputs that must be pulled up to a common

referenced supply no greater than DC +40V. The transistors are capable of a

maximum nonconductive load of DC 50 mA, Use only pin 7 as the common.

5.4.2. Pin 5 generates a High to Low signal when the battery inside the UPS has less than

5 minutes back up time left.

5.4.3. Pin 2 generates a High to Low signal when the line is fail.

5.4.4. The UPS will shut down when a high RS-232 level is sustained on pin 6 for 0.36

seconds.

5.4.5. Pin 9 is also the RS-232 data output.

5.4.6. Pin 6 is RS-232 data input (RxD)

NOTE:

1. Switch rating +40V, 0.15A non-inductive.

2. Pin 7 should be connected to ground only.

Communicating Interface Port

We provide a standard RS232 line (that is compatible with DB9 line) socket on the rear panel

of UPS. That port possesses several signals as explained below:

Pin# Function Explanation I/O

2 Power Fail-normally open status, will become closed during active OUTPUT

4 Reference GND for pin2,5 OUTPUT

5 Battery Low- normally open status, will become closed during

active

OUTPUT

6 Remote shutdown UPS-keep this pin at high voltage(+5V~+12V)

500ms to shutdown UPS. Activates at battery mode

INPUT

7 Reference GND for pin6 INPUT