Compuprint 4247-Z03 - Manual (Page 189)

The Serial Interface
The 4247 Model Z03 attaches to a host or controller with the RS-232C serial
interface. A single, 9-pin D-connector mounted directly on the adapter card allows
attachment to the interface.
The RS-232C interface uses a standard serial cable up to 15.2 m (50 ft) in length,
with transmission rates up to 19.2 Kbps.
RS-232C connector pin assignments
Table 31 lists the RS232/C serial interface signals:
Table 31. RS232/C serial interface signals
Signal
Name Pin
Number
Local
Connect.
Source
Remote
Connect.
Source Description
SIGNAL
GROUND 5 – – Always connected to the 0 Volts of the
Power Supply
TXD 3 Printer Printer Transmitted Data Signal (an output from
printer). A MARK condition is held during
IDLE communication state. An
indeterminate state is present when
printer is powered off.
RXD 2 Host Data Set Received data signal (an input to printer).
RTS 7 Printer Printer Request to Send Signal (an output from
printer). Active HIGH level signal. It is
HIGH until the printer is powered off,
then an indeterminate state is present .
CTS 8 Data Set Active HIGH level signal indicates that the
host or data set is ready to receive data
from the printer.
DSR 6 Data Set Active HIGH level signal. Indicates that
the host or data set is ready to be
connected to the printer and is ready for
data transfer.
DCD 1 Data Set Active HIGH level signal. Indicates that
the host is transmitting or the data set is
receiving the Data Carrier signal.
2nd RTS 9 Printer Functionally equivalent to the DTR signal.
DTR 4 Printer Printer Data Terminal Ready. Normally HIGH
(ON). Indicates that the printer is ready to
initiate a connection.
Appendix A. Printer Specifications 173