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Chapter 4 RS-232 And RS-422 Serial Interfaces
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 13. 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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