Rs-232C Interface Voltage Levels; Rs-422A Interface Voltage Levels - Kyocera Ecosys FS-600 Service Manual

Serial interface signals
The following table provides details for the signals used on the IB-10 serial interface board.
Signal
FG (Pin 1)
T D (Pin 2)
X
R D/RDA (Pin 3)
X
RTS (Pin 4)
CTS (Pin 5)/DSR (Pin 6)
SG (Pin 7)
SDA (Pin 8)
SDB (Pin8)
DTR - Data Terminal Ready (Pin 20)

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. The voltage levels of the RS-422A signals are equivalent to those of the RS-232C
signals except the signals used for transmission and reception.

RS-422A interface voltage levels

The interface signal voltage levels for RS-422A conforms with the EIA RS-422A standards. The
differential voltage ranges is from 200 mV to 6V.
Serial interface—Option (IB-10)
Meaning
This pin is connected directly to the printer frame.
RS-232C only: This output carries asynchronous data sent by the printer
to the computer. It is used mainly in handshaking protocols.
This input carries serial asynchronous data sent by the computer to the
printer. In RS-422A, this carries the inversed differential data (RDA).
This output is always held high (above 3 V).
Unused.
All signals can transmit between the printer and the host computer to
send each signals with a signal ground.
This output transmits asynchronous inversed form of differential data
from the printer to the computer.
This output carries asynchronous non-inversed form of differential data
from the cmputer to the printer.
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.
A-9
Printer interface
FS-600/FS-680