81H (Tamper Alarm)

This message can be sent to the backend server when a tamper alarm event is detected.

Report carrying this record is a high-priority report, please see here for more information.

The frame format of a report that only carries 81H record is as follows:

For example (Total 64 bytes):
2B 00 00 40 00 01 23 45 67 89 01 23 45 C0 31 00 0A 00 00 29 66 8E 47 F7 00 00 81 00 7D 06 00 01 00 00 01 2C 52 16 09 F9 20 A8 E1 FF 2D C0 96 5F 17 9D A0 01 7D 0A 00 25 00 01 B3 0C 01 23 69 24

Parts	Fields		Length (Byte)	Range/Format	Default
Head			18 or 20
Reserved			1 or 1+N
Records	Record Length		1 or 2	00H-7FH or 8080H-FFFFH
	Generated Time		4
	Record Count Number		2	0000H-FFFFH
	Record ID		1	81H	81H
	Event Code		1	00H, 01H
	Data of Record	Data ID	1 or 2	00H-7FH or 8080H-FFFFH
		Data Length	1 or 2	00H-7FH or 8080H-FFFFH
		Data Content	N
		…
	…
Tail			4

The definitions of parts ‘Head’, ‘Reserved’, and ‘Tail’ are here.

• Event Code

  • 00H - The tamper alarm has been released.

  • 01H - The tamper alarm has been triggered.

• Data of Record

  It consists of one or more Data ID units.

  By default, this record contains only the data IDs listed below, which can be changed by the AT@QRC command described below.

  • Data 82 - Full Location.

  • Data 125 - Tamper Status.

Configuration

The parameters related to the generation and transmission of 81H record are controlled by the following QRC command:

Example:
AT@QRC=gl601###,81,,1,1,2|88,0,012F$
+ACK:QRC,123456789012345,C031,10,0,81,012F,20210407101530,1234$
AT@QRC?gl601###,81,0C37$
+QRY:QRC,123456789012345,C031,10,0,1,1,81,,1,1,2|88,0,0C37,20210407101530,1234$

Parts	Fields	Length (Byte)	Range/Format	Default
Head	Header	3	AT@	AT@
	Command Word	3	QRC	QRC
	Leading Symbol	1	=	=
	Password	8-16		gl601###
Body	Record ID	2	81	81
	Reserved	0
	Mode	<=2	0, 1, 12	1
	Action	1	0-2
	Data IDs	N	ID1|ID2|ID3…
	Time Interval	<=4	0 or 10-3600 (seconds)	0
Tail	Sequence Number	4	0000-FFFF (‘0’-‘9’, ‘A’-‘F’)
	Tail	1	$	$

• Record ID

  Which record to configure. Always “81” here.

• Mode

  • 0 - Disable. The terminal no longer generates and sends the 81H record.

  • 1 - Enable Report. The terminal generates and sends the 81H record. If the location information needs to be included, the terminal directly uses the currently existing location information (even if the location information has expired).

  • 12 - Enable Report (Event first). In order to report the event in time, the terminal immediately generates and sends a report. If the location information contained in this sent report has expired, the terminal will wait for real-time positioning, then generate and send one more report (Note: To distinguish between the two reports, the highest bit of the event code for the appended report is set to 1, i.e. plus 80H).

  Note

  For Mode 12, if the report does not need to carry location information, it is equivalent to Mode 1.

• Action

  • Empty - No change the data IDs in the terminal. If this field is empty, the ‘Data IDs’ field will be ignored.

  • 0 - Append the data IDs carried in the ‘Data IDs’ field to the terminal.

  • 1 - Replace the data IDs in the terminal with the data IDs carried by the ‘Data IDs’ field.

  • 2 - Clear the data IDs carried in the ‘Data IDs’ field from the terminal.

  Note: In particular, it always will be 1 when reading this field.

• Data IDs

  The data IDs contained in the 81H record. The characters ‘|’ are used to connect each data ID.

  For example, “2|88” means Data 2 (Device Name) and Data 88 (SIM Card).

• Time Interval

  When the terminal is in tamper alarm state, the terminal will periodically generate a Record 81H at this interval to repeat the tamper alarm. And a value of 0 in this field means that no need to generate and report the tamper alarm repeatedly.