.. _headlabel-refx-data-121:

Data 121 (Internal Temperature)
===============================

The internal temperature detected by the terminal.

The frame format of the Data **121** unit is as follows:

.. code-block:: none

   For example (Total 8 bytes):
   79 06 01 90 5D D5 2E FA

.. tabularcolumns:: |p{3.2em}|p{8.2em}|p{5.8em}|p{16em}|p{5.8em}|

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

   +---------+--------------------------------------------+---------------+---------------------------------------------+--------------+
   | Parts   | Fields                                     | Length (Byte) | Range/Format                                | Default      |
   +=========+============================================+===============+=============================================+==============+
   | ID      | Data ID                                    | 1             | 79H (121)                                   | 79H (121)    |
   +---------+--------------------------------------------+---------------+---------------------------------------------+--------------+
   | Length  | Data Length                                | 1             | 00H or 06H                                  |              |
   +---------+--------------------------------------------+---------------+---------------------------------------------+--------------+
   | Content | `Temperature`                              | 2             | 0000H-FFFFH (\*0.1°C)                       |              |
   +         +--------------------------------------------+---------------+---------------------------------------------+--------------+
   |         | `Time`                                     | 4             |                                             |              |
   +---------+--------------------------------------------+---------------+---------------------------------------------+--------------+

- `Temperature`

  Temperature detected from inside the terminal.

  Expressed as a 16-bit signed integer and the unit is 0.1°C.

  For example, 0190H means the internal temperature is 40.0°C, and FF43H means the internal temperature is -18.9°C.

- `Time`

  Record the moment when the 'Internal Temperature' is updated.

  Difference, in seconds, between the current local time and midnight, January 1, 1970.

  For example, 5DD52EFAH (i.e., 1574252282) indicates November 20, 2019, 12:18:02, and 5DB38C80H (i.e., 1572048000) indicates October 26, 2019, 00:00:00.