Canon BJC-55 Service Manual page 71

BJC-50
2. ASK Interface
1) Interface
SHARP Liquid Crystal Pen Computer:
2) Optical specifications
Light generation
Wavelength:
Intensity:
Light angle:
Light interception
Wavelength:
Intensity:
Light angle:
3) Transfer speed
9600 bps
4) Communication method
Half duplex, start/stop system (unidirectional)
5) Communication distance
Approx. less than 30 cm
6) Maximum received data size
512 byte/block
7) Modulation method
ASK (Amplitude Shift Keying) Method (carrier: 500 kHz)
8) Received signal
Transfer Speed B
5V
0V
D
T
Infrared wave length T: 500kHz
0.85 to 0.90 µm
40 to 500 mW/Sr
±15¡ to 30¡ (along optical axis)
0.85 to 0.90 µm
4 mW/cm to 500 mW/cm
2
Max ± 15¡ (along optical axis)
"0" "1"
B
D: 50%
Figure 2-16 ASK Method
ZAURUS compatible
2
"0"
B
2-21
Part 2: Product Specifications
ASK signal