T H E M O D E R M - B U S T E C H N O L O Y
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6.3.2.2
Baud rate
Baud rate can be set to 300, 600, 1200, 2400, 4800, 9600, 19200 or 38400 baud.
6.3.2.3
Bit Number
You can choose number of bits between 5, 6, 7 or 8 bits. M-Bus is always using 8 bits.
6.3.2.4
Parity
You can choose parity between No Parity, Odd Parity, Even Parity, Mark Parity or Space Parity.
M-Bus is always using Even Parity.
6.3.2.5
Stop Bit
You can choose between 1 or 2 stop bites. M-Bus is always using one stop bit.
6.3.2.6
Timeout (ms)
The parameter timeout is always set to 2000 ms and can be changed freely. This parameter
controls how long the slave port should wait for an answer from the MasterPort. If the value is
lesser than MasterPort t 100ms it is automatically set to MasterPort t 100ms.
6.3.2.7
Protocol
The slave protocols you can currently choose between are M-Bus, M-Bus Ascii, Modbus RTU and
Modbus TCP. Available protocols are controlled by the license key.
6.3.3
M-Bus ASCII options
For an extensive description of the M-Bus ASCII protocol please see separate document.
6.3.3.1
stationid
The parameter stationid is the unit’s internal address when using RS485 multidrop
communication. Stationid is described as ADR (address) in the M-Bus ASCII protocol description.
Stationid has no function when using UDP or TCP communication.
6.3.4
Modbus RTU and TCP options
If you have chosen Modbus RTU or TCP additional parameters may have to be set. In addition
the field ”Configuration File” will be shown and here you will have to choose the cross reference
file. For a more detailed description of the usage of Modbus in the PiiGAB M-Bus 900S/T please
see separate manual.
6.3.4.1
Configuration File
For Modbus RTU and TCP the slave port demands a cross reference file that contains the cross
connection between the Modbus register and OPC Item. The file is uploaded via the field
“Configuration File.” The configuration file itself is created
with assistance from PiiGAB Explorer.
This configuration file has always the extension _MBus2Modbus.csv