• Introduction
• Xcom-API-Class
  • Create and Delete an Object
  • Class-Attributes
  • Information-Methods
    • get_source_address
    • get_destination_address
    • is_crc_check_active
    • get_object_counter
    • get_prog_name
    • get_prog_version
  • Public-Class-Methods
    • get_read_frame
    • get_read_frame_ext
    • get_write_frame
    • get_write_frame_ext
    • get_data_from_frame
    • get_data_from_frame_ext
    • get_bin_from_frame_flags
    • get_text_from_frame_flags
    • get_text_from_error_id
• Hardware Setup
  • Hardware Information
  • Xcom-232i-Setup
  • Raspberry Pi Setup
    • Copy Image to a SD-Card
    • Create your own Image
• Test-Program
  • Run Test-Program
  • Xcom-Test-Loop-Program
  • Xcom-Test-Program

def get_data_from_frame_ext(self, bytearray_of_frame, data_format):

The "get_data_from_frame_ext" method is used to decode data from the received byte-frame, what you get from the Xtender-System. If CRC-Check is active, it will check the byte-frame and raises a Value_Error, if a CRC-Error was detected. This method return a list with two elements. The first is a boolean value, which is true, if the xtender-system detects an error and the second element of the list then contains the error-id. If no error occures, then the first element is false und the second element contains the answer of your request. The returned value of the second element is a string, integer or float, depending of the service (read/write) of the request frame and of the format of the received Property_Data.

The "self" argument is pointing to the object, which calls the method.

The "bytearray_of_frame" argument is the frame what you get, when you receive data from the serial port.

The "data_format" described the format of the received Property_Data.

Format:

_format_bool                          = [1,1]
_format_format                        = [2,2]
_format_short_int                     = [3,2]
_format_enum                          = [4,2]
_format_short_enum                    = [5,2]
_format_long_enum                     = [6,4]
_format_error                         = [7,2]
_format_int32                         = [8,4]
_format_float                         = [9,4]
_format_byte                          = [10,1]

Type -> list

list[0]: Type -> boolean

list[1]: Type -> depending of the service (read/write) of the request frame and of the format of the received Property_Data

>>> # create an object of the Xcom-API-Class
>>> Object = Xcom_API()
>>> 
>>> # create a variable with a received frame
>>> Frame =  bytearray(b'\\xAA\\x37\\x65\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x0E\\x00\\xAA\\x66\\x02\\x01\\x02\\x00\\x53\\x04\\x00\\x00\\x05\\x00\\x00\\xD0\\x14\\x42\\x86\\x8D')
>>> 
>>> # call the Method 'get_data_from_frame_ext'
>>> Answer = Object.get_data_from_frame_ext(Frame, Xcom_API._format_float)
>>> 
>>> # print Answer
>>> print(Answer)
    (False, 37.203125)

Hochschule Anhalt | Anhalt University of Applied Sciences | Department 6 EMW
Xcom-API

Tobias Müller, M. Eng.
📧 Tobias.Mueller@HS-Anhalt.de

© es-lab.de, 31.10.2017