Rs-232C Protocol; Serial Interface (Option; Rs-232C Interface - Kyocera FS-9120DN Operating Manual

Appendix B Host Computer Interface

3. Serial Interface (Option)

3.1 RS-232C Interface

The pins of the printer's RS-232C interface connector carry
the signals listed in the table below. The table also indicates
whether each signal is incoming or outgoing with respect to
the printer.
Pin In/out Signal
1 - FG
2 Out TXD
3 In RXD
4 Out RTS
5 In CTS
6 In DSR
7 - SG
20 Out DTR
Table B-3
Brief descriptions of the signals follow.
FG - Frame Ground - (Pin 1)
This pin is connected directly to the printer frame.
TXD - Transmit Data - (Pin 2)
This output carries asynchronous data sent by the printer to
the computer. It is used mainly in handshaking protocols.
RXD - Receive Data - (Pin 3)
This input carries serial asynchronous data sent by the com-
puter to the printer.
RTS - Request To Send - (Pin 4)
This output is always held high (above 3 volts).
CTS - Clear To Send - (Pin 5)
DSR - Data Set Ready - (Pin 6)
Unused.
SG - Signal Ground - (Pin 7)
All signals can transmit between the printer and the host
computer to send each signal with a signal ground.
DTR - Data Terminal Ready - (Pin 20)
This output is used as a buffer nearly-full handshake line. It is
held high (above 3 volts) when the buffer can accept more data.
RS-232C Interface Voltage Levels
The voltage levels of the interface signals conform to EIA RS-
232C specifications. SPACE is from 3 volts to 15 volts. MARK
is from –3 volts to –15 volts. Voltages between –3 volts and 3
volts are undefined.
B-3
Description
Frame ground
Transmit Data
Receive Data
Request To Send
Clear To Send
Data Set Ready
Signal Ground
Data Terminal Ready

4. RS-232C Protocol

A protocol is a set of rules the computer follows in sending
data to the printer. They are indicated on the status page. Pa-
rameters can be changed from the operator panel. See
Changing Serial Interface Modes on page 3-19
ters and their identification codes are given below.
H1: Baud rate
Parameter value Baud rate
12 1200
24 2400
48 4800
96 9600
19 19200
38 38400
57 57600
11 115200
Table B-4
The factory default setting is 9600 baud.
H2: Data bits
7 or 8; the factory default setting is 8.
H3: Stop bits
1 or 2; the factory default setting is 1.
H4: Parity
Parameter value Meaning
0 None
1 Odd
2 Even
3 Ignore
Table B-5
The factory default setting is None (0 on the status printout).
. The parame-