X20 system modules • X20 electronics module communication • X20CS1012
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X20 system User's Manual 3.10
4.18.3.8.5 M-Bus - Configuration
Separate configuration registers are provided for each value to read. These must be configured correctly in order
to call up a counter value from the M-Bus network. The user must know the following values from the slave:
•
Transfer rate configured on the slave
•
Primary address configured on the slave (value: 1 to 250, otherwise only point-to-point connection is pos-
sible)
•
Data type / data length of value
•
How the slave's memory is structured
Information:
The following section "M-Bus - Configuration" is based solely on the B&R Standard interface.
4.18.3.8.5.1 Data length
Name:
CfO_LengthData1 to CfO_LengthData8
The Standard interface is able to request data from the M-Bus slave with different lengths. When using Automation
Studio the value of the "Length" register is a result of the data type defined for the X2X Link. All common data
types with up to 4 bytes in length are supported.
Data type
Value
USINT
0 to 7
Bit structure:
Bit
Name
Value
Information
00 0000
USINT
00 0001
SINT
00 0010
UINT
00 0100
UINT
00 1000
UDINT
01 0000
UDINT
0 - 5
Data length code
10 0000
REAL
6 - 7
Reserved
0
4.18.3.8.5.2 Transfer rate
Name:
CfO_BaudData1 to CfO_BaudData8
This register can be used to define the transfer rate for retrieving the desired values.
Data type
Value
USINT
1 to 8
Bit structure:
Bit
Name
Value
Information
0000
Reserved!
0001
300 bit/s
0010
600 bit/s
0011
1200 bit/s
0100
2400 bit/s
0101
4800 bit/s
0110
9600 bit/s
0111
19200 bit/s
0 - 3
Baud rate (Code)
1000
38400 bit/s
4 - 7
Reserved
0
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