X20 system modules • X20 electronics module communication • X20CS1012
1520
X20 system User's Manual 3.10
Index record 1
Data query block
The M-Bus parameters to be retrieved from the memory of the M-Bus slaves are requested in the request part.
The user can request certain parameters from the slave or the entire slave memory.
Introduction
Bytes
Name
Value
Description
1
Index record type
1!
Data request for M-Bus slave
0
•
Communication via native M-Bus
•
Read out M-Bus raw data
2
Counter (data parameter) = (d + 1)
1 - 20
Number of parameters to read out
3
Length of subsequent block - Low
0 - 255
•
Length of M-Bus frame to be sent
•
Length of parameter block
•
0! with raw data query
4
Length of subsequent block - High
0 - 255
•
Length of M-Bus frame to be sent
•
Length of parameter block
•
0! with raw data query
...
Depending on request:
•
Native M-Bus frame
•
Parameter block
Not needed if raw data query = 0
M-Bus frame
M-Bus frame to be sent
Bytes
Name
Value
Description
1
TxByte 1
0 - 255
Byte 1 in output direction
2
TxByte 2
0 - 255
Byte 2 in output direction
n
TxByte n
0 - 255
Byte n in output direction
Parameter block
Data parameter 0
Bytes
Name
Value
Description
1
Parameter number
0!
2
Data index
1 - 255
Data index in the M-Bus frame
Data parameter 1
Bytes
Name
Value
Description
2
Parameter number
1!
3
Data index
1 - 255
Data index in the M-Bus frame
Data parameter d
Bytes
Name
Value
Description
...
Parameter number
d!
...
Data index
1 - 255
Data index in the M-Bus frame
Summary of Contents for X20 System
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