Curtiss-Wright Controls Inc GSMK4 Manual De Usuario
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GeoScope
TM
User’s Manual
© 2013 3d-Radar AS
Page 10
Revision 2.0 Date: 02/07/2013
2.4
Distance Measurement Instrument (DMI)
The DMI consists of an optical encoder that measures the distance of
movement and generates trigger pulses to the GeoScope. The DMI outputs
quadrature TTL pulses to allow detection of forward or reverse travel
direction. The DMI should be recalibrated at least each time you change its
mounting.
The DMI input connector (Lemo EGG.2B.312.CLL) has the following pin
configuration:
movement and generates trigger pulses to the GeoScope. The DMI outputs
quadrature TTL pulses to allow detection of forward or reverse travel
direction. The DMI should be recalibrated at least each time you change its
mounting.
The DMI input connector (Lemo EGG.2B.312.CLL) has the following pin
configuration:
The relationship between DMI Tick count and the quadrature pulses is shown
in Figure 10. One tick is counted for each rising or falling edge of pulse trains
A and B.
Figure 10 - DMI pulses.
The supplied DMI encoder has 1000 pulses/rev.
Parameter
Recommended settings
Position data
$GPGGA (1Hz output rate)
Velocity data
$GPVTG (1Hz output rate)
Baud rate
115,200
Data bits
8
Parity
None
Stop bit
1
Pin
Signal
1
+5V DC to DMI-1, max 50mA
2
DMI-1: Quadrature A (TTL)
3
DMI-1: Quadrature B (TTL)
4
Reserved
5
Reserved
6
GND
7
GND
8
DMI-2: Quadrature A (TTL)
9
DMI-2: Quadrature B (TTL)
10
Reserved
11
Reserved
12
+5V DC to DMI-2, max 50mA
1
B
Tick
A
2 3 4 5 6 7 8 9 10 11 12