PNI SeaTRAX - Manual (Page 29)

PNI Sensor Corporation DOC#1018154 r02
SeaTRAX User Manual Page 24
6.3.4 Output
The SeaTRAX module can output heading, pitch, and roll in either degrees or mils. Click
either the <Degrees> or <Mils> button. The default is <Degrees>. (There are 6400 mils
in a circle, such that 1 degree = 17.7778 mils and 1 mil = 0.05625 degree.)
6.3.5 Enable 3D Model
SeaTRAX Studio’s Test tab includes a live-action 3-D rendering of a helicopter. Some
computer systems may not have the graphics capability to render the 3D Model, for this
reason it may be necessary to turn off this feature.
6.3.6 Filter Setting (Taps)
The SeaTRAX incorporates a finite impulse response (FIR) filter to effectively provide a
more stable heading reading. The number of taps (or samples) represents the amount of
filtering to be performed. The user should select either 0, 4, 8, 16, or 32 taps, with zero
taps representing no filtering. Note that selecting a larger number of taps can
significantly slow the time for the initial sample reading and, if “Flush Filters” is
selected, the rate at which data is output. The default setting is 32.
6.3.7 Acquisition Settings
Mode
When operating in Continuous Acquisition Mode, the SeaTRAX continuously
outputs data to the host system. The rate is set by the Sample Delay. When operating
in Poll Mode, SeaTRAX Studio simulates a host system and polls the SeaTRAX for a
single measurement; but SeaTRAX Studio makes this request at a fixed rate which is
set by the Polling Delay. In both cases data is continuously output, but in Continuous
Mode the SeaTRAX controls the data rate while in Poll Mode the SeaTRAX Studio
program controls the data rate. Poll Mode is the default.
Poll Delay
The Poll Delay is relevant when Poll Mode is selected. It represents the time delay,
in seconds, between the completion of SeaTRAX Studio receiving one set of sampled
data and requesting the next sample set. If the delay is set to 0, then SeaTRAX
Studio requests new data as soon as the previous request is fulfilled. Note that the
inverse of the Poll Delay is greater than the sample rate, since the Poll Delay does not
include the actual measurement acquisition time. The default is 0.