See "Enhanced Buffered Read Words (Er) - Pepperl+Fuchs IC-KP2-2HB21-2V1D Manual

IC-KP2-2HB21-2V1D
Commands
enhanced buffered read words (ER)
Command:
Byte
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Response:
Byte
Byte 0
Byte 1
Byte 2
Byte 3
Byte 5
Byte 5
Byte 6
Byte 7
Byte 8
...
Byte N
Table 7.6
The R/W head makes attempts until successful, to read <WordNum> 32-bit words
from the address <WordAddr>. Only modified data is transferred via the interface.
When a read/write tag leaves the detection range, the status '05h' (read
command) is output.
42
Content
Control byte
Reserved
Command code - 19
h
Reserved
Word address
Word address
Word count
Word count
Content
Control byte
Reserved
Command code - 19
h
Reserved
Status
Reply counter
Word count
Word count
Data 00h ... FF
h
Data 00h ... FF
h
Data 00h ... FF
1)
h
1) N = 4 x <WordNum> + 7
Bit no.
7 6 5 4 3
0 0 0 0 0
0 0 0 0 0
0 0 0 1 1
0 0 0 0 0
<WordAddr> (high byte)
<WordAddr> (low byte)
<WordNum> (high byte)
<WordNum> (low byte)
Bit no.
7 6 5 4 3
0 0 0 0 0
0 0 0 0 0
0 0 0 1 1
0 0 0 0 0
<Status>
<ReplyCounter>
<WordNum> high byte
<WordNum> (low byte)
<Data>
<Data>
<Data>
2 1 0
D U U
S M S
0 0 0
0 0 1
0 0 0
2 1 0
D U U
S M S
0 0 0
0 0 1
0 0 0