Rs-422 – Printronix T4204 User Manual
Page 186
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
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