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Chapter
5
RS-232 And RS-422 Serial Interfaces
Input Signals
Signal
Received Data (RD)
Clear To Send (CTS)
Data Set Ready (DSR)
Data Carrier Detect (DCD) 8
Input Signals
Signal
- Receive Data (-RD)
+ Receive Data (+RD)
RS-232 And RS-422 Serial Interface Signals
The RS-232 connector mounted on the printer is a 25-pin DB-25S type. The
mating connector is a DB-25P. RS-232 and RS-422 compatible serial
interface signals are defined as follows:
RS-232:
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 deferentially received by printer.
+TD, -TD — Deferentially driven serial data stream for transmitting status and
control information.
NOTE: ±RD and ±TD form signal and return paths of a differential line signal.
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Table 1. RS-232 Serial Interface Connector Pin Assignments
Output Signals
Pin
Signal
3
Transmit Data (TD)
5
Request To Send (RTS)
6
Data Terminal Ready (DTR)20
Table 2. RS-422 Serial Interface Connector Pin Assignments
Output Signals
Pin
Signal
15 - Transmit Data (-TD)
17 + Transmit Data (+TD)
Miscellaneous
Pin
Signal
2
Chassis Ground
4
Signal Ground
Miscellaneous
Pin
Signal
19 Chassis Ground
25 Signal Ground
Pin
1
7
Pin
1
7
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