Brother DX-2000, Service Manual

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III-2
3. I/F PCB
The I/F PCB consists of two connectors (8-pin modular jack connectors) for connection of
the printer to other optional devices, a paper pressure motor, a cassette sensor, an open
cover sensor connector, and a connector for connection of the harness from the main
PCB.
This board only relays signals among the paper pressure motor, cassette sensor, open
cover sensor and printer and the main PCB.
4. COMMUNICATION WITH THE PRINTER
A 3-line clock synchronous serial interface is used for communication between the
Duplex unit and the printer.
The following describe the timing of communication way.
GND
DATAOUT
DATAIN
CLKOUT
/ATNOUT
/OPRST
+24V
GND
+24V
/OP RESET
/ATTN
SICLK
SIDATA
DATAIN
DATAOUT
CLKIN
/ATNIN
/RESET
REG.
Printer Duplex unit
GND
+5V
+24V
Figure 3.2