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[Digital signal circuit]
• The output voltage of the JOYBALL is led to CN104.
The X-component of the output voltage is then fed to the
Port E bit0 and the Y-component to the Port E bit1 of the
micro-computer, where the component data are A/D
converted. The converted data are then fed into the IF-
511 board through the UART (IC111), the line driver/
receiver IC (IC112), and CN103 as operating data for
PAN/TILTER. The micro-computer continuously
controls the key scan circuit of the KIO-9 board. Once
the key is depressed, the key data are fed to the micro-
computer through CN104. The micro-computer sends
data to the LCD module and the on-screen-display IC
(IC103), according to the data received. The data from
the controller is, on the other hand, sent to the micro-
computer through CN103, the line driver/receiver IC
(IC112), and the UART (IC111). The micro-computer
sends data to the LCD module and the on-screen-display
IC (IC103), according to the data received.
Key Matrix Board (KIO-9)
• The board consists of the key scan circuit 8255A
(IC301) and the LED drive circuit.
[Key scan circuit]
• IC301 sends the scan data consecutively from the Port B
according to the input data from CN301. The data of the
depressed key are led to the Port A. The switches,
SW301 - SW349, form a matrix circuit, and according to
the data given from the Port A and Port B the circuit
determines which switch is depressed.
[LED drive circuit]
• The buffer IC (IC302) drives LED's. With the Port set in
"LOW" mode, the LED illuminates.
The Port setting of the 8255A (IC301) is as follows:
PA0 - PA7: Key scan input
PB0 - PB5: Key scan output
PC0, PC1: LED drive output
CSP-5000E
CSPK-5000E
Connector Board (IF-511)
• The board consists of the key board and the connectors
for connection with external equipment.
• The input video signals from CN203 are terminated by a
75 Ω impedance and sent to the SY-211 board through
CN202. The output video signals are, on the other hand,
sent to CN204 through CN202 with the impedance of
75 Ω. The data exchange with the controller is
established through CN205 (modular) and those data are
sent to the SY-211 board through CN201.
JOYBALL Section
• The JOYBALL section is a joy stick type which uses a
piezoelectric device. The piezoelectric device produces
voltages when mechanically strained. The voltages are
proportional to strains given to the device in X- and Y-
directions.
LCD Module Section (LM40X21B)
• The LCD module section consists of the dot-matrix LCD
panel (negative-type), the drive circuit, the controller
LSI, and the LED's illuminating in yellow-green. The
micro-computer controls the module.
5-9
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