Campbell Scientific SR50A Distance Sensor - Manual (Page 3)

SR50A Table of Contents
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1. Specifications ..............................................................1
2. Introduction..................................................................2
3. Operation......................................................................2
3.1 Quality Numbers.......................................................................................3
3.2 Temperature Compensation......................................................................3
3.3 SDI-12 Operation .....................................................................................4
3.3.1 SDI-12 Wiring ................................................................................4
3.3.2 SDI-12 Addresses ...........................................................................4
3.3.3 SDI-12 Commands..........................................................................4
3.4 RS-232 Operation .....................................................................................6
3.4.1 RS-232 Wiring................................................................................6
3.5 RS-485 Operation .....................................................................................7
3.5.1 RS-485 Wiring................................................................................7
3.6 RS-232 and RS-485 Settings ....................................................................8
3.6.1 BAUD Rate Setting.......................................................................10
3.6.2 Address .........................................................................................10
3.6.3 Operational Mode Setting .............................................................10
3.6.3.1 Measure in Poll Mode .........................................................10
3.6.3.2 Auto Measure Auto Output Mode.......................................11
3.6.3.3 Auto Measure Polled Output Mode.....................................11
3.6.4 Distance to Target or Depth..........................................................11
3.6.5 Distance to Ground .......................................................................11
3.6.6 Measurement Interval Units..........................................................12
3.6.7 Measurement Interval Value.........................................................12
3.6.8 Output Unit ...................................................................................12
3.6.9 Quality Output ..............................................................................12
3.6.10 Temperature Output ....................................................................12
3.6.11 Diagnostics Output......................................................................12
3.7 Serial Commands....................................................................................13
3.7.1 Setup Command............................................................................13
3.7.2 Poll Command ..............................................................................13
3.7.3 Information Command..................................................................13
3.7.4 Temperature Input command ........................................................13
3.8 RS-232/RS-485 Data Output Format......................................................14
3.8.1 Measurement Output.....................................................................14
3.8.2 Information Message Output ........................................................15
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