Read Sharp ER-A490 (serv.man2) Service Manual online
500KHz
"0"
"1"
"0"
"1"
16-division
3/16
UART
Reverse
UART
UART
IRDA
ASK
58.5~76.5 ms
108 ms
108 ms
9 ms
4.5 ms
13.5 ms
Leader Code
Custom Code
8 bits
8 bits
Custom Code'
8 bits
8 bits
Data Code
8 bits
8 bits
27 ms
18 ms~36 ms
58.5 ms~76.5 ms
Data Code
8 bits
8 bits
9 ms
4.5 ms
13.5 ms
1.125 ms
2.25 ms
0
1
1
0
0
1
9 ms
2.25 ms
11.25 ms
0.56 ms
Time is the value for 455kHz oscillation.
First
time
time
Carrier waveform
Carrier frequency.....fc=fosc/12=38 khz
Second time and later
(Transmitted only when the key is depressed.)
(Transmitted only when the key is depressed.)
8.77µs
26.3µs
9 ms or 0.56 ms
<Remote keyboard>
0.56 ms
System
IRDA
ASK
REMOTE KEYBOARD
Carrier wave
950 nm
900
∼
1050 nm
900
∼
950 nm
Sub-carrier wave
(16 times of baud rate clock)
500 kHz
±
10%
33
∼
40 kHz
Modulation
system
system
"0": HIGH level
"1": LOW level
Only around the center of the bit cycle
in HIGH level, 3/16 of the bit cycle is set
HIGH, and the rest is set LOW.
"1": LOW level
Only around the center of the bit cycle
in HIGH level, 3/16 of the bit cycle is set
HIGH, and the rest is set LOW.
Pulse modulation:
The pulse array of data code is
modulated by the AM system.
The pulse array of data code is
modulated by the AM system.
Pulse modulation:
The pulse array is modulated by data
codes in the PPM system.
The pulse array is modulated by data
codes in the PPM system.
Primary modulation:
The sub-carrier waveform is
amplitude-modulated with this pulse
array.
The sub-carrier waveform is
amplitude-modulated with this pulse
array.
Primary modulation:
The sub-carrier waveform is
amplitude-modulated with this pulse
array.
The sub-carrier waveform is
amplitude-modulated with this pulse
array.
Secondary modulation:
With the sub-carrier waveform which
was modulated in the primary
modulation, infra-red rays are
amplitude-modulated.
With the sub-carrier waveform which
was modulated in the primary
modulation, infra-red rays are
amplitude-modulated.
Secondary modulation:
With the sub-carrier waveform which
was modulated in the primary
modulation, infra-red rays are
amplitude-modulated.
With the sub-carrier waveform which
was modulated in the primary
modulation, infra-red rays are
amplitude-modulated.
Modulated
waveform
waveform
Baud rate
2.4
∼
115.2 kbps
9.6
∼
57.6 kbps (ZR-5000: 9600 bps)
—
Serial
communication
system
communication
system
Start-stop synchronization system
Data length: 8bit
Parity:
Data length: 8bit
Parity:
None
Stop bit:
1
Start-stop synchronization system
Data length: 8bit
Parity:
Data length: 8bit
Parity:
ODD
Stop bit:
1
—
Transmission
distance
distance
About 0.75m: ECR to ECR
Min. 0.65m
Min. 0.65m
About 0.75m: ECR to ECR
Min. 0.65m
Min. 0.65m
About 1m
31
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