Communications Ports

RS-232C

Pin#

Signal Name

Type

Description

1

RXD

input

Receive Data

2

TXD

output

Transmit Data

3

CTS

input

Clear To Send from host

4

RTS

output

Request To Send set high when

 

 

 

printer is ready to accept a

 

 

 

command or data

5

GND

 

Ground

6

NC

 

No Connect

7

DSR

input

Data Set Ready: low to high

 

 

 

transition turns printer on, high to

 

 

 

low transition turns printer off (if

 

 

 

enabled)

8

DTR

output

Data Terminal Ready: set high when

 

 

 

printer is on.

 

 

 

Set to battery voltage for “S”

 

 

 

versions (compatible with Symbol™

 

 

 

PIM)

 

 

 

 

2

5

4

 

1

3

6 7

8

Figure 27: RS-232C Communications Port (8 pin Circular DIN)

70

QL Plus Series User Guide