Serial Port Pin Assignment - Kyocera Ecosys FS-6700 Service Manual

Replace the main controller board back into the printer. Secure the board by the
three screws.

Serial port pin assignment

The pins of the parallel interface connector carry the signals listed below. The RS-
422A specific signals are noted in the Definition.
Table A. 5 Serial port assignment
No.
1 FG
2 TxD
3 RxD/RDA
4 RTS
5 CTS
6 DSR
7 SG
9 SDA
10 SDB
18 RDB
20 DTR
Other Not con-
nected
Table A. 6 Meaning of signals—1/2
Signal
FG
TXD
RXD/RDA
RTS
CTS/DSR
RS-232C
position
Signal Flow
—
Printer to host
Host to Printer
Printer to host
Host to printer
Host to printer
—
Printer to host
Printer to host
Host to printer
Printer to host
Undefined
Pin
1 This pin is connected directly to the printer frame.
2 RS-232C only: This output carries asynchronous data sent
by the printer to the computer. It is used mainly in hand-
shaking protocols.
3 This input carries serial asynchronous data sent by the
computer to the printer. In RS-422A, this carries the
inversed differential data (RDA).
4 This output is always held high (above 3 V).
5/6 Unused.
A-6
RS-422A
position
Definition
Frame ground
Transmit data: RS-232C
Receive data/receive data (Reversed)
Transmit request
Transmit permitted
Data-set-ready
Signal ground
Transmit data (Reversed): RS-422A
Transmit data: RS-422A
Receive data: RS-422A
Data-terminal-ready
—
Meaning
FS-6700