Returning an array from generic_message

[MULLERGuilherme]

Hi, I am using this Library in order to read an write data to a ConveyLinx device, I can successfully read and write data while using the class b'\x64' (program_name) using the "physical" parameters from the device, however, i would like to access the "virtual" parameters from it by using assemblies. However, due to my inexperience with the protocol, I am struggling to do it.

Following the device documentation (https://www.manula.com/manuals/pulseroller/conveylinx-ersc/2/en/topic/reading-ersc-input-assembly-with-msg-instruction), i changed the class to b'\x64' (assembly), and used the instance 105 (Assem105 in the EDS file) and used the attributes 3 and 4 (according to documentation), though i didn't figure why these attributes are the only ones supported. The device documentation shows the Assem105 being stored in an array, however, i am not sure how can i get this array here. Am i doing something wrong? Did i misunderstood something?

Assembly example from EDS file:

[Assembly]
        Object_Name = "Assembly Object";
        Object_Class_Code = 0x04;
        Assem105 =
                "ZPA to PLC",
                "20 04 24 69 30 03",
                ,
                0x0000,
                ,,
                16,Param116,
                16,Param196,
                16,Param106,
                16,Param107,
                16,Param186,
                16,Param187,
                32,Param88,
                32,Param119,
                32,Param199,
                16,Param105,
                16,Param185,
                32,Param201,
                32,Param121,
                16,Param35,
                16,Param514,
                16,Param19;

How i called my read_parameter function:

def read_parameter(device_ip, service, class_code, instance, attribute):

    with CIPDriver(device_ip) as drive:
        param = drive.generic_message(
            service=service,
            class_code=class_code,
            instance=instance,
            attribute=attribute,
            data_type=INT,
            connected=True,
            name='read_param'
        )
        print(param)
        return param.value

read_parameter("192.168.202.39", b'\x0e', b'\x04', 105, 3)

Output from the print function inside read_parameter:

read_param, 0, INT, None

Thanks in advance

[Colt-H]

I believe your data type needs to be set to an array. See below:

        param = drive.generic_message(
            service=service,
            class_code=class_code,
            instance=instance,
            attribute=attribute,
            data_type=INT[10], #change 10 to the size of the array you're reading
            connected=True,
            name='read_param'```