Printronix P7000 Cartridge Ribbon Printer - Manual (Page 278)

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Chapter 5 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 16. PSA3 RS-422 Serial Interface Connector Pin Assignments
Input Signals Output Signals Miscellaneous
Signal Pin Signal Pin Signal Pin
- Receive Data
(-RD)
1 - Transmit Data
(-TD)
3 Chassis/Signal
Ground 5
+ Receive Data
(+RD)
6 + Transmit Data
(+TD)
8