Panasonic DX-600 Service Manual page 223

6.2.9 Control Panel
The Control Panel consists of the Display PCB and Panel Unit, which display various status information.It is
normally interfaced to the main CPU. Keyed input signals are received by the Panel CPU and the data is
transferred to the main CPU on the SC PC Board.
The Control Panel performs the following processes simultaneously:
• Key inputting
• LED, LCD display
• Data transmission / reception
Interface to main CPU
The interfacing between the main CPU and the panel CPU are all executed with commands and responses
in the following two formats:
• Command / response (1 byte) + number of data + check sum
• Command / response (1 byte) + number of data + data 1 + data 2........................ + data n + check sum.
Edition 1.0
From 11
/to
SC
PCB
PNLCK
PNLRD
PNLSD
PNLRST
BZCLK
+5V
+5VP
GND
GND
nPWSAVE
nWAKEUP
nBPNT
BATLVL
KIN (7:0)
20 characters, 2 lines, 5x7 dots control
LED, KEY scanning
LEDCT (1:0)
2
8
LED
LED (1:0)
Key matrix
(59 keys)
8
SCN (7:0)
8
PNL1 PC Board
223
DX-600/800
APR 2002