Chapter 4 RS-232 And RS-422 Serial Interfaces

Data Carrier Detect (DCD). Status signal to the printer. The ON condition is required for the printer to receive data.

Data Terminal Ready (DTR). Control signal from the printer. Subject to configuration.

RS-422

Table 12. RS-422 Serial Interface Connector Pin Assignments

Input Signals

 

Output Signals

 

Miscellaneous

 

Signal

Pin

Signal

Pin

Signal

Pin

 

 

 

 

 

 

 

 

 

 

 

 

- Receive Data

15

- Transmit Data

19

Chassis Ground

1

(-RD)

 

(-TD)

 

 

 

+ Receive Data

17

+ Transmit Data

25

Signal Ground

7

(+RD)

 

(+TD)

 

 

 

 

 

 

 

 

 

+RD, -RD—Serial data stream differentially received by printer.

+TD, -TD—Differentially driven serial data stream for transmitting status and control information to the host. Subject to protocol selection.

NOTE: ±RD and ±TD form signal and return paths of a differential line signal.

186

Page 186
Image 186
Printronix T4204 manual RS-232 And RS-422 Serial Interfaces