Campbell-scientific SR50A Distance Sensor Bedienungsanleitung PDF herunterladen (Seite 31)

SR50A Sonic Ranging Sensor

• Power can now be applied to the SR50A by connecting the connector and

applying power to the sensor. The Green LED should remain on when

powered up properly.

• Setup Hyperterminal or the communications program that you are using as

follows:

o BAUD rate: 38400

o Data Bits: 8

o Parity: None

o Stop Bits: 1

o Flow control: XON/XOFF

o 25ms line delay (under ASCII setup)

• From the Hyperterminal menu select Transfer -> Send Text File.

• Select the new download text file and the transfer should begin.

• Initially the LED should remain constantly on. When data transfer begins

the LED will flash rapidly with each line that is reprogrammed.

• Upon completion the LED will remain steadily on again. If there are any

errors the LED will flash to indicate that an error occurred.

• If the LED does flash attempt the reprogram process again.

• After the reprogramming is successful, disconnect the sensor from the

power supply.

• Move the jumper back from the Program position to the Run position.

• Re-assemble the sensor.

• Verify operation of the sensor by obtaining a measurement.

9. Data Interpretation

Although not common the SR50A can occasionally output invalid reading

indicators if it was unable to obtain a measurement. For distance to target

values a 0.0 reading is usually output. For snow depth outputs a -999 is output

as an error indicator value. An invalid temperature reading is also indicated by

a -999 reading. For snow depth applications these can be easily filtered out

when analysing the data.

Consideration should be taken in a control type application to deal with invalid

readings. For example if the sensor is used to initiate a water level alarm then

multiple readings should be used to ensure that a single invalid reading does

not trigger the alarm condition.

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Campbell-scientific SR50A Distance Sensor Bedienungsanleitung Seite 31