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Control Register #75(0x4b) (control_reg [75]:)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Notes
Default Value
0x00
control_reg [0x4b]: Range Processing Criteria for two echoes. Max signal, Max/Min Range.
Bit 0 Select
Controls echo processing selection :"1" switches to alternative return; "0" Selects
Second Return
data associated with detection criteria
Bit 1 Select
"1" selects return data based on distance; "0" selects strongest return,
Range Criteria
regardless of distance
Bit 2 Select Max
"1" selects the longer distance; "0" selects the shorter distance
Range
The detection criteria is controlled by bit positions 1 and 2. If "Select Range Criteria" is 0 (zero), the system
will always select the strongest signal present. In this case, regardless of the number of returns, the
strongest return will be measured. If "Select Range Criteria" is one, then the longer or shorter valid return will
be selected without consideration of relative signal strength. "Select Max Range" selects the longer or
shorter return. "Select Second Return" selects the raw data associated with the rejected return pulse
allowing the reprocessing of the second data set to extract distance and signal strength.
To reprocess the data "Select Second Return" is set to 1 without changing the state of bits 1 and 2 of
register 75. This followed by sending a value of 1 to the command register [0] initiates a reprocessing of the
pulse return data. After reading the second pulse distance data, "Select Second Return" should be set back
to zero to return to the desired pulse detection criteria.
LIDARLite v1 "Silver Label" Manual , Updated: 08/13/15
Bit 2
Select Max Range Select Range Criteria Select Second Return
Bit 1
Bit 0
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