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Analog Outputs
Analog signals are output from a 12 bit digital to analog converter with a series resistor to protect
the analog buffer amplifier. The output range for all of the analog output channels is ±10 Volts
with respect to the common signal ground. The outputs include:
Data
Bank
Elevation
Heading
Roll Rate (X Axis)
Pitch Rate (Y Axis)
Yaw Rate (Z Axis)
X Acceleration
Y Acceleration
Z Acceleration
Forward Acceleration
Lateral Acceleration
Vertical Acceleration
Note that the analog switches are disabled after certain serial commands are sent to the unit. This
prevents software/hardware switch conflicts.
Analog Inputs
In an effort to make this system more versatile, the DMS allows the user to input analog data that
can then be added to the serial data output. This allows the system to act as a data acquisition unit
for other vehicle information such as engine RPM, engine temperature, fuel remaining,
altitude/depth or any other important data. The four analog user inputs as well as the velocity input
have one megohm input impedance, 16 bit A/D conversion resolution, ±10 volt input range and
have a bandwidth of DC to 25 Hertz.
Speed Inputs
A vehicle speed input is used to assist in the correction of errors. It is also included in the
parameter set that is available for serial output. Although its use is not always required, it is highly
recommended that this signal be supplied to the DMS. The unit can receive speed information in
two formats, an analog or digital signal. The internal GPS receiving unit provides the digital
signal.
The optional analog speed input signal is a voltage that is scaled to 40 KPH per volt. Forward
motion should produce a positive signal with respect to signal ground. Many other velocity scale
factors can be handled through simple changes in the scale factor stored in the EEPROM in the
microprocessor. This can be done with a PC and the assistance of the factory.
Watson Industries, Inc.
Pin
Range
±180° / ±10V
14
±90° / ±5V
15
0-360° / ±10V
16
±100°/s / ±10V
23
±100°/s / ±10V
24
±100°/s / ±10V
25
±10G / ±10V
17
±10G / ±10V
18
±10G / ±10V
19
±10G / ±10V
20
±10G / ±10V
21
±10G / ±10V
22
DMS-EGP02 Rev A 03/28/2008
10
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