I/F Pcb; Communication With The Printer - Brother DX-2000 Service Manual

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.
DATAOUT
DATAIN
CLKOUT
/ATNOUT
/OPRST
Printer
SIDATA
SICLK
/ATTN
/OP RESET
+24V
+24V
GND
GND
Figure 3.2
III-2
Duplex unit
DATAIN
DATAOUT
CLKIN
/ATNIN
/RESET
+5V
REG.
GND
+24V