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Table 5–6. RS–422 Serial Interface Connector Pin Assignments
Input Signals Output Signals Miscellaneous
Signal Pin Signal Pin Signal Pin
–
Receive Data (–RD)
15 – T
ransmit Data (–TD)
19
Chassis Ground
1
+ Receive Data (+RD)
17 + T
ransmit Data (+TD)
25
Signal Ground
7
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.