user manual

Rev. A2, 11/08 IRU-2xx4/3xx4
11
Automation Products Group, Inc.
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BLANKING
Blanking allows the sensor to ignore all echoes returned before this distance.
There is a minimum distance to which this can be set which is 152 millimeters.
This distance (or time) allows the ceramic in the transducer to stop vibrating after
it has transmitted a series of pules.
To read the current setting for the blanking in the sensor:
Send Receive
AAh Start Byte 66h Start Byte
01h, Sensor Number 01h Sensor Number
05h Command 05h Command
00h Data (not used) ##h Blanking (High Byte)
00h Data (not used) ##h Blanking (Low Byte)
55h End Byte ##h NA
99h Stop Byte
To send a new Blanking distance use the command structure:
Send
AAh Start Byte
01h, Sensor Number
06h Command
00h Data (High Byte)
00h Data (Low Byte)
55h End Byte
Example: Suppose the sensor is mounted in a position that were a partial
structure is located 600 mm from the sensor head. The desired detection range
is from 650 mm to 2100 mm . Setting the blanking at 620mm would allow the
sensor to ignore the structure and monitor the desired detection area.