MEITRACK T622 GPRS Protocol
Copyright © 2017 Meitrack Group All rights reserved. - 33 -
GPRS Reply
$$o28,012896001078259,C43,0101*85
3.39
Reading Temperature Sensor Parameters – C44
GPRS Sending
C44
GPRS Reply
C44,
Number 1
/
SN1
/
High temperature value 1
/
Low temperature value 1
/
High
temperature alert 1
/
Low temperature alert 1
/
Logical name 1
/…
Number n
/
SNn
/
High
temperature value n
/
Low temperature value n
/
High temperature alert 1
/
Low
temperature alert 1
/
Logical name n
Description
n: The maximum value is 8.
Number: one byte in hexadecimal format.
SN: indicates the temperature sensor SN, and has eight bytes in hexadecimal format.
High/Low temperature value: two bytes in hexadecimal format. The first byte is the
integer part. When the high bit is
1
, the first byte is a negative integer. When the high
bit is
0
, the first byte is a positive integer. The second byte is the decimal part.
High temperature alert: one byte in hexadecimal format.
Low temperature alert: one byte in hexadecimal format.
Logical name (customized name): 16 bytes in hexadecimal format. If the name length is
less than 16 bytes, add 0x00. There are 15 English characters, and # is located at the end
of English characters to distinguish the Unicode and English characters. A maximum of
eight Chinese characters can be supported. Chinese characters must be the Unicode.
Note: Separators (/) are not required between parameters.
Applicable Model
T622
Example
(ASCII is used to display examples because hexadecimal characters cannot be displayed.)
GPRS Sending
@@r25,012896001078259,C44*90\r\n
GPRS Reply
$$r274,012896001078259,C44,01(B4v#040000R0000000000000000000000
000000000000000000000002(1BD5#040000W000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000
00000000000000000000*1E\r\n
3.40
Checking Temperature Sensor Parameters – C46
GPRS Sending
C46
GPRS Reply
C46,
Checksum
Description
Checksum: two bytes in hexadecimal format. Use CRC-CCITT to calculate parameters of
eight temperature sensors (in sequence: number, SN, high temperature value, low
temperature value, high temperature alert, low temperature alert, and logical name).
The calculation result is used as the temperature sensor checksum.