Kyocera Mita FS-1900, Service Manual

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C-7
FS-1900
Signal Meaning
FG (Pin 1) This pin is connected directly to the printer frame.
TxD (Pin 2) This output carries asynchronous data sent by the printer to the computer.
It is used mainly in handshaking protocols.
RxD (Pin 3) This input carries serial asynchronous data sent by the computer to the
printer.
RTS (Pin 4) This output is always held high (above 3 V).
CTS (Pin 5) Unused.
DSR (Pin 6) Unused.
SG (Pin 7) All signals can transmit between the printer and the host computer to send
each signals with a signal ground.
DTR (Pin 20) This output is used as a buffer nearly-full handshake line. It is held high
(above 3 V) when the buffer can accept more data.
Serial interface (option)
This printer is supported protocol of RS-232C serial interface, and printer is equipped a connector
(YC5
A
) on the main board for a serial interface. The printer is able to connect the computer
through its RS-232C serial interface when optional serial interface board IB-10E
B
is installed.
The serial interface board IB-10E has a 25-pin D-sub connector
C
. serial interface specifications
and interface signals are as follows:
RS-232C interface voltage levels
The voltage levels of the RS-232C signals conform to EIA RS-232C specifications. FALSE is from
3 volts to 15 volts. TRUE is from -3 volts to -15 volts. Voltages between -3 volts and 3 volts are
undefined.
Connector configurations
A
C
B