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Promet EExd User's Manual
Register Configuration I
15
14
13
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
Val 1 & 2 are in BCD, therefore 10H = 10, 58H = 58 and 09H = 9 etc. As a result A to
F are not valid values.
Values for Cycle Time and Max Cool Time are in units of 5 mins.
Register Configuration J
15
14
13
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
Values in HEX i.e. 17th March = 1103H
Register Configuration K
15
14
13
r
r
r
Sign bit = 1 for –ve values (signed int)
7FFF = 32767
8000 = -32768
Register Configuration L
The humidity values for sensors 1 & 2 are represented in IEEE-754 single precision
floating point format, in order to cater for the wide range in the value of ppm
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
Sign bit
0 = +
1 = -
Michell Instruments
12
11
10
9
Val 1
12
11
10
9
Day or Hours
– signed int
12
11
10
9
r
r
r
r
- Floating Point Representation
Bits 30 to 23
Exponent Field
Has a +127 bias value
8
7
6
5
4
8
7
6
5
4
Minutes or Month
8
7
6
5
4
r
r
r
r
Value
Bits 22 to 0
Decimal representation of binary
Where 1.0 ≤ value < 2.0
APPENDIX F
3
2
1
0
Val 2
3
2
1
0
3
2
1
0
r
r
r
r
r
. This
V
mantissa
65
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