Kyocera Ecosys FS-6700, Service Manual

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A-6 FS-6700
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. Signal Flow Definition
1 FG — Frame ground
2 TxD Printer to host Transmit data: RS-232C
3 RxD/RDA Host to Printer Receive data/receive data (Reversed)
4 RTS Printer to host Transmit request
5 CTS Host to printer Transmit permitted
6 DSR Host to printer Data-set-ready
7 SG — Signal ground
9 SDA Printer to host Transmit data (Reversed): RS-422A
10 SDB Printer to host Transmit data: RS-422A
18 RDB Host to printer Receive data: RS-422A
20 DTR Printer to host Data-terminal-ready
Other Not con-
nected
Undefined —
Table A. 6 Meaning of signals—1/2
Signal Pin Meaning
FG 1 This pin is connected directly to the printer frame.
TXD 2 RS-232C only: This output carries asynchronous data sent
by the printer to the computer. It is used mainly in hand-
shaking protocols.
RXD/RDA 3 This input carries serial asynchronous data sent by the
computer to the printer. In RS-422A, this carries the
inversed differential data (RDA).
RTS 4 This output is always held high (above 3 V).
CTS/DSR 5/6 Unused.
RS-232C
position
RS-422A
position