Data 121 (Internal Temperature)

The internal temperature detected by the terminal.

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

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

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.