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Chapter 5 RS-232 And RS-422 Serial Interfaces
306
Clear To Send (CTS). Status signal to the printer indicating the host is
ready to receive data/status signals from the printer.
Data Set Ready (DSR). Status signal to the printer indicating the host is
in a ready condition.
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
+RXD, -RXD.Serial data stream differentially received by printer.
+TXD, -TXD.Differentially driven serial data stream for transmitting
status and control information to the host. Subject to protocol selection.
NOTE:
±RXD and ±TXD form signal and return paths of a differential
line signal.
Table 14. PSA3 RS-422 Serial Interface Connector Pin Assignments
Input Signals Output Signals Miscellaneous
Signal Pin Signal Pin Signal Pin
- Receive Data
(-RXD)
1- Transmit Data
(-TXD)
3 Chassis/Signal
Ground
5
+ Receive Data
(+RXD)
6 + Transmit Data
(+TXD)
8