Michell Instruments Condumax II User Manual page 85

Condumax II User's Manual
APPENDIX F
Format I
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w
Hi Lo
 
The values for Hi & Lo are in BCD, therefore 10H = 10, 58H = 58 and 09H = 9 etc... Bits
15 to 12 in the Wdp batch number (001D) are allowed to have a value between A to F,
otherwise they are invalid.
Values for Cycle Time and Max Cool Time are in units of 5 minutes.
Format J
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Hi Lo
 
Values in HEX i.e. 17th March = 1103H
Format L - Floating Point Representation
The moisture content in natural gas of the water dew point is represented in IEEE-754
single precision fl oating point format, in order to cater for the wide range in the value of
ppm(v). This format is 'Big Ended' which means that the high byte is at a lower address
in memory than the Lo byte, and is represented as such in the register memory map.
The IEEE-754 format is shown below.
Bit 31 Bits 30 to 23 Bits 22 to 0
Sign bit mantissa
Exponent Field
0 = + Decimal representation of binary
has a +127 bias value
1 = - Where 1.0 <= value < 2.0
Michell Instruments 77