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Rs-422 – Printronix T4204 User Manual

Page 186

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186

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

+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.

Table 12. RS-422 Serial Interface Connector Pin Assignments

Input Signals

Output Signals

Miscellaneous

Signal

Pin

Signal

Pin

Signal

Pin

- Receive Data

(-RD)

15

- Transmit Data

(-TD)

19

Chassis Ground

1

+ Receive Data

(+RD)

17

+ Transmit Data

(+TD)

25

Signal Ground

7