CJ/T-188 water meter protocol analysis, cjt-188 Water Meter Analysis

CJ/T-188 water meter protocol analysis, cjt-188 Water Meter Analysis
CJ/T-188 water meter protocol analysis in this paper to illustrate the analysis process of CJ/T-188 water meter protocol, the following data without special instructions, refer to hexadecimal.
 
Data transmission:
FE 68 10 44 33 22 11 00 33 78 01 03 1F 90 00 80 16
Description:
FE: protocol header (group 1-4 ).
68: frame start character.
10: meter type. This instance is a cold water meter and can also be defined:
10: Cold Water Meter
11: domestic hot water meter
12: Direct Drinking Water Meter
13: Water Meter
20: Heat table (heat)
21: Heat table (cold amount)
30: Gas Meter
40: Power Meter
44 33 22 11 00: the descending order is 0011223344 (in BCD format), indicating the table number.
33 78: the descending order is 7833 (in BCD format), indicating the manufacturer code.
01: the control code is used to read the table data, followed by a fixed data domain length, data identifier, and serial number.
03: data domain length (fixed ).
1F 90: Data identifier (fixed ).
00: serial number (fixed ).
80: Sum, 68 + 10 + 44 + 33 + 22 + 11 + 00 + 33 + 78 + 01 + 03 + 1F + 90 + 00 = 80.
16; Terminator.

Reply data:
FE 68 10 44 33 22 11 00 33 78 81 16 1F 90 00 77 66 55 2C 00 77 66 55 2C 31 01 22 11 05 15 20 21 84 08 16
Description:
FE: protocol header (group 1-4 ).
68: frame start character.
10: instrument type.
44 33 22 11 00: the descending order is 0011223344 (in BCD format), indicating the table number.
33 78: the descending order is 7833 (in BCD format), indicating the manufacturer code.
81: the actual control code is + 80. We can simply think that only 81 is correct. If not 81 is abnormal, no Parsing is performed.
16: the length of the data field, in decimal format 22, indicating that there are 22 valid data in the end.
1F 90: Data identifier (fixed ).
00: serial number (fixed ).
00 77 66 55: the reverse order is 556677.00 (in BCD format), indicating the cumulative usage.
2C: cubic meter. For other units, see Appendix 1.
00 77 66 55: the reverse order is 556677.00 (in BCD format), indicating the usage this month. 2C: cubic meter. For other units, see Appendix 1. 31 01 22 11 05 15 22:01:31-05-11, indicating the real-time.
21 84: Status, two bytes, 1st bytes defined as follows, 2nd bytes customized by the manufacturer. 68: Sum, 68 + 10 + 44 + 33 + 22 + 11 + 00 + 33 + 78 + 81 + 16 + 1F + 90 + 00 + 77 + 66 + 55 + 2C + 00 + 77 + 66 + 55 2C + 31 + 01 + 22 + 11 + 05 + 15 + 20 + 21 + 84 = 08. 16; Terminator.
 
Attachment: Organization Code

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