Zebra QLn420 User's Guide download pdf (Page 68)

68

QLn Series User Guide

Communications Ports

RS-232C

Pin# Signal Name Type Description

1

CTS

input

Clear To Send from host

2 TXD output Transmit Data

3

RXD

input

Receive Data

4

DSR input Data Set Ready: low to high transition

turns printer on, high to low transition

turns printer off (if enabled)

5 GND Ground

6

DTR output Data Terminal Ready: set high when

printer is on.

Switched 5V (300mA max)

7

N/A Do Not Use

8

RTS

output

Request To Send set high when printer is

ready to accept a command or data

9 N/A Do Not Use

10 N/A Do Not Use

11 N/A Do Not Use

12 N/A Do Not Use

13 N/A Do Not Use

14 N/A Do Not Use

8

2

5

3

1

4

10

12

14

13

11

9

7

6

Figure 38: RS-232C Communications Port

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