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LubriMist
®
Model JD
Oil Mist Generating System
Installation and Operating Manual
Page 93 of 152
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.
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