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rs-22c
RS-232C serial communication interface is a standard feature that can be
used by authorized service personnel. It is provided through a DB9 female
connector located on the back of the UPS (see "Layout ", page 15). This
interface allows communication between the UPS and a personal computer.
The chart below shows the signals and the connector pinout.
Pin
I/O
1
2
Input
3
Output
4
Output
5
-
6
Input
7
Output
8
Input
9
(*) (**) These pins are tied together internally in the UPS. Signals DTR, DSR,
RTS, and CTS are not used.
1800 Series User Manual
Symbol
This pin not used
RXD
Receive Data
TXD
Transmit Data
DTR*
Data Terminal Ready
GND
Signal ground
DSR*
Data Set Ready
RTS**
Request to Send
CTS**
Clear to Send
This pin not used
DB9 Female Connector Outline
(facing connector)
Description
In the UPS
N/C
RXD
TXD
GND
N/C
1
2
3
4
5
6
7
8
9
2
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