Commands
2014-
02
35
Second step
The identification command
change tag
must be sent to the identification system to set the tag
type.
The slave must confirm that the executed MODBUS transaction was successful. If this is not
the case, the master generates an error message.
Third step
In this example, the read command is initiated by the identification command
enhanced read
.
Address
(0-based)
Register division
Byte number of the
identification
telegram
Use
Contents
Meaning
2000d
High byte
Reserved
00h
-
Low byte
Reserved/Deletion bit
(LSB)
00h
No delete operation
2001d
High byte
Byte 0
Length of the identifi-
cation telegram from this
byte onwards
00h
-
Low byte
Byte 1
Length of the
identification telegram
06h
6 bytes long
2002d
High byte
Byte 2
Command code
04h
change tag
command
Low byte
Byte 3
Reserved/Channel/
Toggle bit
00h
No channel
specification required
2003d
High byte
Byte 4
Data carrier type
High byte
30h
IPC03
Low byte
Byte 5
Data carrier type
Low byte
33h
IPC03
Table 7.7
Required parameter settings for the data carrier type
Address
(0-based)
Register division
Byte number of the
identification
telegram
Use
Contents
Meaning
2000d
High byte
Reserved
00h
-
Low byte
Reserved/Deletion bit
(LSB)
00h
No delete operation
2001d
High byte
Byte 0
Length of the
identification telegram
from this byte onwards
00h
-
Low byte
Byte 1
Length of the
identification
telegram
06h
6 bytes long
2002d
High byte
Byte 2
Command code
19h
enhanced read
command
Low byte
Byte 3
Word number/Channel/
Toggle bit
40h
Read 4 words, no
channel specification
required
2003d
High byte
Byte 4
Word address
High byte
00h
Read from data carrier
address 0
Low byte
Byte 5
Word address
Low byte
00h
Same as previous
byte
Table 7.8
Executing the read command
