.. _headlabel-refx-data-4:

Data 4 (Device Serial Number)
=============================

The frame format of the Data **4** unit is as follows:

.. code-block:: none

   For example (Total 17 bytes):
   04 0F 4D 50 30 39 39 32 31 44 38 30 30 30 31 33 33

.. tabularcolumns:: |p{3.2em}|p{16.2em}|p{5.8em}|p{8em}|p{5.8em}|

.. table::
   :width: 100%
   :widths: auto

   +---------+-----------------------------------------------+---------------+------------------------------------------+--------------+
   | Parts   | Fields                                        | Length (Byte) | Range/Format                             | Default      |
   +=========+===============================================+===============+==========================================+==============+
   | ID      | Data ID                                       | 1             | 04H (4)                                  | 04H (4)      |
   +---------+-----------------------------------------------+---------------+------------------------------------------+--------------+
   | Length  | Data Length                                   | 1             | 00H-14H                                  |              |
   +---------+-----------------------------------------------+---------------+------------------------------------------+--------------+
   | Content | `Device Serial Number`                        | 0-20          |                                          |              |
   +---------+-----------------------------------------------+---------------+------------------------------------------+--------------+

- `Device Serial Number`

  The unique serial number of the terminal device.

  For example, "MP09921D8000133" is represented by 4D 50 30 39 39 32 31 44 38 30 30 30 31 33 33.