Common sensor Protocol 5:cj/t-188 Water Meter Protocol analysis 2__cjt-188

This paper will take SC water meter as an example to continue to explain the cj/t-188 Water Meter Protocol of the switching valve protocol analysis process, the following data without special description, all refer to hexadecimal.

Open valve:
Data transmission: FE fe fe fe-A0 17 01 55 50 16
The description is as follows:
Fe fe FE: Protocol head (1-4 groups).
68: The frame start character.
10: Instrument Type, this example refers to the water meter, also can be defined as:
69 05 90 05 15: Reverse is 1505900569 (in BCD form), representing the table number.
33 78: Reverse to 7833 (in BCD form), indicating the manufacturer's code.
04: Control code, followed by the fixed data field length, data identification and serial number.
04: Data field Length (fixed).
A0 17: Data identification (fixed).
01: Serial Number (fixed).
55: Function code, indicating open valve.
50: Cumulative and, from the agreement head 68 to the function code 55 tired plus and.
16; end character.
Reply data:
Fe fe fe fe-A-A0 for 16 (7C)
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16-17
The description is as follows:
Fe fe FE: Protocol head (1-4 groups).
68: The frame start character.
10: Instrument type.
69 05 90 05 15: Reverse is 1505900569 (in BCD form), representing the table number.
33 78: Reverse to 7833 (in BCD form), indicating the manufacturer's code.
84: The actual control code +80, we can simply think that only 84 correct, not 84 are exceptions, do not parse.
05: Data field length, decimal 22, indicating that there are 22 valid data after.
A0 17: Data identification (fixed).
01: Serial Number (fixed).
00 00: State Word, 0000 normal open valve, 0001 normal shutoff valve, 0011 abnormal.
7 C: Cumulative and, from the agreement head 68 to the state word 00 tired plus and.
16; end character.

Off valve:
Data transmission: FE fe fe fe-A0 17 01 99 94 16
The description is as follows:
Fe fe FE: Protocol head (1-4 groups).
68: The frame start character.
10: Instrument Type, this example refers to the water meter, also can be defined as:
69 05 90 05 15: Reverse is 1505900569 (in BCD form), representing the table number.
33 78: Reverse to 7833 (in BCD form), indicating the manufacturer's code.
04: Control code, followed by the fixed data field length, data identification and serial number.
04: Data field Length (fixed).
A0 17: Data identification (fixed).
01: Serial Number (fixed).
99: Function code, indicating that the valve is closed.
94: Cumulative and, from the agreement head 68 to the function code 55 tired plus and.
16; end character.
Reply data:
Fe fe fe fe-A-A0 (7C 16).
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16-17
The description is as follows:
Fe fe FE: Protocol head (1-4 groups).
68: The frame start character.
10: Instrument type.
69 05 90 05 15: Reverse is 1505900569 (in BCD form), representing the table number.
33 78: Reverse to 7833 (in BCD form), indicating the manufacturer's code.
84: The actual control code +80, we can simply think that only 84 correct, not 84 are exceptions, do not parse.
05: Data field length, decimal 22, indicating that there are 22 valid data after.
A0 17: Data identification (fixed).
01: Serial Number (fixed).
00 01: State Word, 0000 normal open valve, 0001 normal shutoff valve, 0011 abnormal.
7 D: Cumulative and, from the agreement head 68 to the State Word 01 tired plus and.
16; end character.

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