Honeywell VC4 User Manual page 137

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
0000 0010 (02)
1000 0010 (82)
0000 0000 (00)
VC4™
Interpretation
137
3.17 PPB
3.17 PPM
317 PPB
User Manual