Toshiba 1800 User Manual

1800 Series User Manual

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

Symbol

Description

In the UPS

1

This pin not used

2

Input

RXD

Receive Data

3

Output

TXD

Transmit Data

4

Output

DTR*

Data Terminal Ready

5

-

GND

Signal ground

6

Input

DSR*

Data Set Ready

7

Output

RTS**

Request to Send

8

Input

CTS**

Clear to Send

9

This pin not used

(*) (**) These pins are tied together internally in the UPS.  Signals DTR, DSR, 

RTS, and CTS are not used.

DB9 Female Connector Outline

(facing connector)

N/C

N/C

GND

TXD

RXD

1
2
3
4

7

6

5

8

9