20
13
-0
3
72
Commands
Enhanced write words with lock (EL)
Command:
Response:
This command is the same as a normal write command. The data is write-
protected at the end of the write process, provided the tags offer this function.
This applies for 13.56 MHz tags of the type 21, 22, 24, and 33 as well as for LF
tags IDC-
…
-1K. Write protection is only activated for memory blocks involved in
the write process. Data can continue to be written to all other memory blocks.
The R/W head repeatedly attempts to write <WordNum> 32-bit words from the
address <WordAddr> until successful. After each successful write, the head
sends the response and then switches to continuous reading. Then the R/W head
reads the same tag until it has left the detection range or a new tag appears within
the detection range. The command then starts again with write attempts.
The status '05h' is only output when a tag leaves the detection range or is not yet
within the detection range. If two tags enter the read range one immediately after
the other, the status '05' is not issued between the two readings.
Byte
Contents
Bit no.
7
6
5
4
3
2
1
0
Byte 0
Command code (48h)
0
1
0
0
1
0
0
0
Byte 1
Word number/Ident channel/Toggle bit
<WordNum>
<Channel>
<T>
Byte 2
Word address
<WordAddr>(high byte)
Byte 3
Word address
<WordAddr> (low byte)
Byte 4
Data 00h ... FFh
<Data>
Byte 5
Data 00h ... FFh
<Data>
...
Data 00h ... FFh
<Data>
Byte N
1)
Data 00h ... FFh
<Data>
Table 7.10
1) 4 x <WordNum> + 6
Byte
Contents
Bit no.
7
6
5
4
3
2
1
0
Byte 0
Command code (48h)
0
1
0
0
1
0
0
0
Byte 1
Word number/Ident channel/Toggle bit
<WordNum>
<Channel>
<T>
Byte 2
Status
<Status>
Byte 3
Reply counter
<ReplyCounter>
Byte 4
not used
-
-
-
-
-
-
-
-
Byte 5
not used
-
-
-
-
-
-
-
-
Byte 6
not used
-
-
-
-
-
-
-
-
Byte 7
not used
-
-
-
-
-
-
-
-
