NDC BETA LaserMike LaserSpeed Pro 8500-4, Инструкция по эксплуатации

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4-26 LaserSpeed Pro 8500-4 Instruction Handbook: Interfacing with the LS8500-4
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Measured Velocity
A
n
a
lo
g
O
u
tp
u
t
/
V
o
lt
s
Analog Output vs Measured Velocity with V
ZS
= 30 and V
FS
= 100
The computer RS-422 pinout can vary with the RS-422 card used. The signal descriptions listed above
should be matched to the signal descriptions listed in the documentation provided with the RS-422 adapter.
4.2.2.3 Analog Output Voltage/Ground (Pins 6-7)
Analog Output Specifications
Voltage Range 0-2V
Resolution 12-bit
(Step Size) 0.5mV
Load
Filtering
Ground
Analog speed data can be obtained in a 0
–2 V format.
An optional selectable voltage/current output module
which will convert the 0
–2 V signal supplied by the
gauge to all of the common voltage/current levels is
available. The analog output indicates speed but not
direction.
There are two configuration settings that affect the
operation of the analog output. The Analog Zero
Scale Velocity sets the speed where the analog out-
put reaches 0V. The Analog Full Scale Velocity sets
the speed where the analog output reaches 2V. At
speeds between these two settings, the analog output
increases linearly as the speed increases from the
Analog Zero Scale Velocity to the Analog Full Scale Ve-
locity.
Example : If the Analog Zero Scale Velocity was set to 30 m/min, and the Analog Full Scale Velocity were set
to 100 m/min, the analog output would behave as shown in the following figure.