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參數(shù)資料
| 型號： | EM4223V8WW11E |
| 廠商： | EM Microelectronic |
| 英文描述： | Read-only UHF Radio Frequency Identification Device |
| 中文描述： | 只讀超高頻射頻識別設(shè)備 |
| 文件頁數(shù)： | 16/29頁 |
| 文件大小： | 437K |
| 代理商： | EM4223V8WW11E |
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R
EM4223
Copyright
2005, EM Microelectronic-Marin SA
16
www.emmicroelectronic.com
Data coding
Data transmitted by the Reader to the Tag is encoded in
PIE format as described in
62H62H
0 and
63H63H
0 above. Four symbols
are encoded; ‘0’, ‘1’, SOF and EOF. The Transponder is
able to decode symbols having values as shown in
10
below.
Symbol
Mean
duration
0
1 Tari
1
2 Tari
SOF
1 Tari followed
by 3 Tari
EOF
4 Tari
Table 17 - PIE symbols
64H64H
Fig.
Limits
Tari < ‘0’
≤
3/2 Tari
3/2 Tari < ’1’ < 3 Tari
Calibration sequence
≥
4 Tari
Values
Table
17
will cause the received data to be rejected and
the EM4223 to wait for an unmodulated carrier of EOF
duration or greater before being ready to receive a new
command.
falling
outside
of
the
limits
in
65H65H
'0'
'1'
'EOF'
'SOF'
Time interval in "Tari"
1
2
3
4
Symbol
Fig. 10 - PIE symbols
Data Frame format
The bits transmitted by the Reader to the Transponder
are embedded in a frame as specified in
66H66H
Fig. 11
. Before
sending the frame, the Reader ensures that it has
established an unmodulated carrier for duration of at
least Taq (Quiet time) of 300μs.
1Tari
Taq
The frame consists of a Start-Of-Frame (SOF),
immediately followed by the data bits and terminated by
an End-Of-Frame (EOF). After sending the EOF the
Reader maintains a steady carrier for sufficient time to
allow all Transponders present to be powered so that
they may send their
Reply
.
B
B
B
B
SOF
EOF
Command + Data
3 Tari
Quiet
Fig. 11 - Forward link frame format
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