This article willtake SC water meter as an example continue to explain the cj/t-188 Water Meter Protocol Switching Valve Protocol parsing process, the following data without special instructions, refers to hexadecimal.
Open valve:
Data sending:Fe fe fe FE, 17 01 55 50 16 (A0)
The description is as follows:
Fe fe fe FE: protocol header (1-4 groups).
68: Frame start character.
10: Instrument Type, this instance refers to the cold water meter, can also be defined as:
69 05 90 05 15: Reverse is 1505900569 (in the form of BCD), indicating the table number.
33 78: Reverse is 7833 (in the form of BCD code), indicating the factory code.
04: Control code, followed by fixed data field length, data ID and serial number.
04: Data field Length (fixed).
A0 17: Data identification (fixed).
01: Serial Number (fixed).
55: Function code, indicating open valve.
: cumulative and, from protocol header 68 to function code 55 Plus and . .
16; Terminator.
Reply data:
Fe fe FE theTen the to - to the - + - toA0 - on xx
7C
, as a one-to-one- ten
The description is as follows:
Fe fe fe fe : protocol header (1-4 groups).
68: Frame start character.
10: Instrument type.
69 05 90 05 15: Reverse is 1505900569 (in the form of BCD), indicating the table number.
33 78: Reverse is 7833(in the form of BCD code), indicating the factory code.
84: Actually for the control code +80, we can simply think that only 84 is correct, not 84 are abnormal, do not parse.
05: Data field length, in decimal 22, indicates that there are 22 valid data behind.
A0 17: Data Identification(fixed).
01: Serial Number (fixed).
XX: status word, 0000 normal open valve, 0001 normal shutoff valve, 0011 abnormal。
7 C: Cumulative and, from the protocol header 68 to the State word 00 are combined with and . .
16; Terminator.
Shutoff valve:
Data sending:Fe fe fe fe, 17 01 99 94 16 (A0)
The description is as follows:
Fe fe fe FE: protocol header (1-4 groups).
68: Frame start character.
10: Instrument Type, this instance refers to the cold water meter, can also be defined as:
69 05 90 05 15: Reverse is 1505900569 (in the form of BCD), indicating the table number.
33 78: Reverse is 7833 (in the form of BCD code), indicating the factory code.
04: Control code, followed by fixed data field length, data ID and serial number.
04: Data field Length (fixed).
A0 17: Data identification (fixed).
01: Serial Number (fixed).
99: Function code, indicating the shut-off valve.
94: Cumulative and, from the protocol header 68 to the function code 55 combined with and . .
16; Terminator.
Reply data:
Fe fe FE theTen the to - to the - + - toA0 - on
7C
, as a one-to-one- ten
The description is as follows:
Fe fe fe fe : protocol header (1-4 groups).
68: Frame start character.
10: Instrument type.
69 05 90 05 15: Reverse is 1505900569 (in the form of BCD), indicating the table number.
33 78: Reverse is 7833(in the form of BCD code), indicating the factory code.
84: Actually for the control code +80, we can simply think that only 84 is correct, not 84 are abnormal, do not parse.
05: Data field length, in decimal 22, indicates that there are 22 valid data behind.
A0 17: Data Identification(fixed).
01: Serial Number (fixed).
About: status word, 0000 normal open valve, 0001 normal shutoff valve, 0011 abnormal .
7 D: Cumulative and, from the protocol header 68 to the State Word 01 are combined with and . .
16; Terminator.
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cj/t-188 Water Meter Protocol Analysis 2
