9 Rev. 2.4 (3/05)
Honeywell Analytics CM4 Protocol Manual
Generic Data Formats
Date Format 2 bytes
Year: (7 bits)
Month: (4 bits)
Day: (5 bits)
Year is based from 1980. 1989 would be
89 - 80 = 9.
Time Format 2 bytes
Hours: (5 bits)
Minutes: (6 bits)
Seconds/2: (5 bits)
Date/Time Date: 1F 56 Oct. 22. 1995
Examples: Date: 1F 75 Nov. 21, 1995
Time: 13 C0 02:30:00
Time: 74 23 14:33:06
Time: 4C 09 09:32:18
Concentration U0XXXYYY
Data Format
Code U = 0 concentration of PPB
1 concentration of PPM
0 = future use
XXX = future use
YYY = used for PPB/PPM (bit 7), and indicates
where the decimal place is located:
000 = no decimal places
001 = 1 decimal place
010 = 2 decimal places
011 = 3 decimal places
For example, (HEX) 82 (1000 0010)
represents PPM with 2 decimal places.
For a concentration value of 317:
Format Code Interpretation
0000 0010 (02) 3.17 PPB
1000 0010 (82) 3.17 PPM
0000 0000 (00) 317 PPB
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