Commands
2014-
02
69
Enhanced buffered write words (EW)
Command:
Response:
Within the reply from the read/write head, <WordNum> is always 0, because the answer does
not contain any user data.
The read/write 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 read. The read/write head then reads the same tag until the tag
has left the detection range or a new tag appears within the detection range. At this point, the
read/write head again starts 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 '05h' is not issued
between the two readings.
Byte
Type
Bit no.
7
6
5
4
3
2
1
0
Byte 0*
Telegram length, high byte
<TelegramLenH>
Byte 1*
Telegram length, low byte
<TelegramLenL>
Byte 2
Command code (1Ah)
0
0
0
1
1
0
1
0
Byte 3
Word number/Channel/Toggle bit
<WordNum>
<Channel>
<T>
Byte 4
Word address
<WordAddr> (high byte)
Byte 5
Word address
<WordAddr> (low byte)
Byte 6
Data 00h ... FFh
<Data>
...
Data 00h ... FFh
<Data>
Byte N
1)
Data 00h ... FFh
<Data>
Byte
Type
Bit no.
7
6
5
4
3
2
1
0
Byte 0*
Telegram length, high byte
0
0
0
0
0
0
0
0
Byte 1*
Telegram length, low byte
0
0
0
0
0
1
1
0
Byte 2
Command code (1Ah)
0
0
0
1
1
0
1
0
Byte 3
Word number/Channel/Toggle bit
0
<Channel>
<T>
Byte 4
Status
<Status>
Byte 5
Reply counter
<ReplyCounter>
Table 7.18
* this byte is only used with the TCP/IP and MODBUS TCP/IP protocol.
1) N = 4 x <WordNum> + 5; Ethernet/IP: N = 4 x <WordNum> + 3
