Commands
2014-
02
67
Enhanced buffered read words (ER)
Command:
Response:
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.
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 (19h)
0
0
0
1
1
0
0
1
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
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 (19h)
0
0
0
1
1
0
0
1
Byte 3
Word number/Channel/Toggle bit
<WordNum>
<Channel>
<T>
Byte 4
Status
<Status>
Byte 5
Reply counter
<ReplyCounter>
Byte 6
Data 00h ... FFh
<Data>
Byte 7
Data 00h ... FFh
<Data>
Byte 8
Data 00h ... FFh
<Data>
Byte 9
Data 00h ... FFh
<Data>
...
Data 00h ... FFh
<Data>
Byte N
1)
Data 00h ... FFh
<Data>
Table 7.16
* 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
