Chapter 5 RS-232 And RS-422 Serial Interfaces

Clear To Send (CTS). Status signal to the printer indicating the host is ready to receive data/status signals from the printer.

Data Set Ready (DSR). Status signal to the printer indicating the host is in a ready condition.

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 14. PSA3 RS-422 Serial Interface Connector Pin Assignments

Input Signals

 

Output Signals

Miscellaneous

Signal

Pin

Signal

Pin

 

Signal

Pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Receive Data

1

- Transmit Data

3

 

Chassis/Signal

5

 

(-RXD)

 

(-TXD)

 

 

Ground

 

 

+ Receive Data

6

+ Transmit Data

8

 

 

 

 

(+RXD)

 

(+TXD)

 

 

 

 

 

 

 

 

 

 

 

 

 

+RXD, -RXD.Serial data stream differentially received by printer.

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

NOTE: ±RXD and ±TXD form signal and return paths of a differential line signal.

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Printronix P7000 user manual RS-422