PNI CompassPoint Prime - Manual (Page 53)

Prime User Manual r08 Page 47
Note: If “Flush Filters” is selected the rate at which the output is updated will be inversely
proportional to the number of taps. For example, if 8 taps and flush filters are selected, the
output will be updated at ~3.5 Hz, while it will be updated at ~1 Hz if 32 taps is selected.
SensorAcqTime:
The SensorAcqTime sets the time between samples taken by the module, in seconds.
The default is 0.0 seconds, which means that the module will reacquire data
immediately after the last acquisition. This is an internal setting that is NOT tied to
the time with which the module transmits data to the host system. Generally
speaking, the SensorAcqTime is either set to 0, in which case the TCM is constantly
sampling, or set to equal the IntervalRespTime value. The advantage of running with
a SensorAcqTime of 0 is that the module can run with a relatively high FIR filter tap
value, thus providing stable and timely data. But using a greater SensorAcqTime can
reduce power consumption.
IntervalRespTime:
The IntervalRespTime is relevant when Push Mode is selected, and is the time delay,
in seconds, between completion of the Prime sending one set of sampled data and the
start of sending the next sample set. The default is 0.0 seconds, which means the
TCM will begin sending new data as soon as the previous data set has been sent.
Note that the inverse of the IntervalRespTime is somewhat greater than the sample
rate, since the IntervalRespTime does not include actual acquisition time. Also, if
IntervalRespTime is less than SensorAcqTime, then repeated data will be sent which
normally is undesirable.
7.3.25 kGetAcqParams (frame ID 25
d
)
This frame queries the Prime for its acquisition parameters. The frame has no payload.
7.3.26 kAcqParamsDone (frame ID 26
d
)
This frame is the response to kSetAcqParams frame. The frame has no payload.
7.3.27 kAcqParamsResp (frame ID 27
d
)
This frame is the response to kGetAcqParams frame. The payload should be the same as
for the kSetAcqParams frame.