Compaq 5532 - Manual (Page 141)

RS-422
141
Received Data (RD). Serial data stream to the printer.
Transmitted Data (TD). Serial data stream from the printer for
transmitting status and control information to the host. Subject to
protocol selection.
Request To Send (RTS). Control signal from the printer. Subject to
configuration.
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
+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 7. 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