LubriMist
®
Model IVT
Oil Mist Generating System
Installation and Operating Manual
Page 134
of 256
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
S
V
14
V
13
V
12
V
11
V
10
V
9
V
8
V
7
V
6
V
5
V
4
V
3
V
2
V
1
V
0
V
0
= Least significant bit (LSB) of 15-bit integer value
V
14
= Most significant bit (MSB) of 15-bit integer value
S = Sign bit
These values are transmitted as “twos-complement” integer numbers. This is a standard method
used in computers to represent signed integers. The following table shows how common values
would be represented in twos-complement form.
Signed Decimal
Number
16-bit Twos-Complement Representation
Binary
Decimal
Hexadecimal
-32,768
1000000000000000
32768
8000
-32,767
1000000000000001
32769
8001
-1
1111111111111111
65535
FFFF
0
0000000000000000
0
0000
1
0000000000000001
1
0001
32,766
0111111111111110
32766
7FFE
32767
0111111111111111
32767
7FFF
Although this representation may appear strange at first, it is useful and numerically correct
because simple addition and subtraction yield correct results and it is the most commonly used
format for that reason.
The actual values transmitted for a given analog input or set point are an exact replica of what is
seen on the control panel in the selected units (English or metric)
with an implied decimal point
where applicable. For example, those values with two digit positions to the right of the decimal
point would be transmitted as a numeric value of one hundred times (100x) the reading seen on
the control panel. So the value 123.45 would be transmitted as 12,345 and the host software will
need to scale accordingly. Note that this only affects those data values representing metric units
of Bars such as supply air pressure, regulated air pressure and supply oil pressure and their
related high and low alarm set points. It does not apply to any values when using English units
since all are displayed with no digits to the right of the decimal point.
