Airflow 90001299, User Manual

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User Manual
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Control board supports only two of standard functions of Modbus. These codes are 03 register reading and 06
register writing (below table). In the example below, master wants to know the 16 bit data on 2 nd register.
Corresponding response value of control board is shown on the table below. In the second example, master
wants to write the 16 bit data on 2 nd register and it is reported to control board that the data was written.
Function 03 Transfer Package Example:
Master Transfer
Address
Information
Function Code Register ID Data Lenght Failure Control
0x01 0x03 0x00,0x02 0x00,0x01 0x25,0xCA
Response of Control Board
Address
Information
Function Code Register ID Data Lenght Failure Control
0x01 0x03 0x00 0x07,0xFF 0xFA,0x34
Function 03 Transfer Package Example:
Master Transfer
Address
Information
Function Code Register ID Written Data Failure Control
0x01 0x06 0x00,0x02 0x0C,0x00 0x2D,0x0A
Response of Control Board
Address
Information
Function Code Register ID Written Data Failure Control
0x01 0x06 0x00,0x02 0x0C,0x00 0x2D,0x0A