CM4 Four-Point Continuous Monitor
CM4 Technical Manual
E-6
E.2.2 Generic Data Formats
Date Format
Size: 2 bytes
Year: (7 bits)
Month: (4 bits)
Day: (5 bits)
Year is based from 1980.
2005 would be 2005 - 1980 = 25.
Time Format
Size: 2 bytes
Hours: (5 bits)
Minutes: (6 bits)
Seconds/2: (5 bits)
Date/Time Examples
Date: 1F 56 Oct. 22. 2005
Date: 1F 75 Nov. 21, 2005
Time: 13 C0 02:30:00
Time: 74 23 14:33:06
Time: 4C 09 09:32:18
Concentration Data Format Code
U0XXXYYY
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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