Rs-232 And Rs-422 Serial Interface Signals - IBM 6400 Setup Manual

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 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:
5–4 6400 Line Matrix Printers Setup Guide, Cabinet and Pedestal Models
RD and TD form signal and return paths of a differential
line signal.