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ljean / modbus-tk

Create Modbus app easily with Python
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How to do ReadFile operation using Modbus_tk library? #159

Closed VigneshwaranKR closed 2 years ago

VigneshwaranKR commented 2 years ago

I'm trying to do read a file from device.But i couldn't able to find the FC20 to read the file.Is Modbus_tk library support Read File.If Yes,how to do it? @ljean

NVTaranets commented 2 years ago

Yes, I wrote the implementation of this team. A brief instruction is placed in the DOC_STRING. @VigneshwaranKR

execute(
        self, slave, function_code, starting_address, quantity_of_x=0, output_value=0, data_format="", expected_length=-1, write_starting_address_FC23=0, number_file=tuple()):
        """
        Execute a modbus query and returns the data part of the answer as a tuple
        The returned tuple depends on the query function code. see modbus protocol
        specification for details
        data_format makes possible to extract the data like defined in the
        struct python module documentation
        For function Read_File_Record 
        starting_address, quantity_of_x, number_file must be tuple () 
        of one long (by the number of requested sub_seq)
        the result will be 
        ((sub _ seq_0 _ data), (sub_seq_1_data),... (sub_seq_N_data)).
        """
NVTaranets commented 2 years ago

Exapmple for one sub_seq: @VigneshwaranKR ` ... result = master.execute(n_modbus,cst.READ_FILE_RECORD,(starting_address,),(quantity_of_x,),number_file=(number_file,)) data=result[0]

`