INFICON BCG450-SD ATM to Ultra-High Vacuum Triple Gauge (DeviceNet) - Manual (Page 33)

tira40e1 (2005-04) BCG450SDv1.cp
33
Appendix
Integer int –32767
… 32768
Unsigned integer uint 0
… 65535
Float float according IEEE 754
Manufacturer product code 13 = BCG450-SD
AA BB CC DD
h (4-Byte, floating format) Legend: XX
h
Hexadecimal number
(Radix = 16)
XX
d
Decimal number (Radix = 10)
XX
b
Binary number (Radix = 2)
DD
h
CC
h
BB
h
AA
h
S E E E E E E E
b
E M M M M M M M
b
M M M M M M M M
b
M M M M M M M M
b
S EEEE EEEE
b
MMM MMMM MMMM MMMM MMMM MMMM
b
Ш Ш Ш
1+
MMM MMMM MMMM MMMM MMMM MMMMb
2
23
⎛
⎝
⎜
⎜
⎞
⎠
⎟
⎟
= 1+
NNNNN
d
d
8388608
⎛
⎝
⎜
⎞
⎠
⎟
Ø
Sign = Exponent = Mantissa =
-1 S XYZ
d
RSTUV
d
Sign × 2
(Exponent-127)
× Mantissa
Sign 8-Bit exponent 23-Bit mantissa
A: Range of Values
B: Specific Codes
C: Conversion of a Floating
Number According to
IEEE 754
General
Number received
1. Reverse the sequence of
the HEX words
2. Separate into bytes
3. Calculate
Converted number