SR50A Sonic Ranging Sensor
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TABLE OF CONTENTS
1
Specifications .................................................................................................................... 4
2
Introduction ....................................................................................................................... 6
3
Operation .......................................................................................................................... 7
3.1
Quality Numbers ........................................................................................................ 7
3.2
Temperature Compensation for SR50A version ........................................................ 8
3.3
Temperature Compensation for SR50AT version ...................................................... 9
3.4
SDI-12 Operation ..................................................................................................... 10
3.4.1
SDI-12 Wiring .................................................................................................. 10
3.4.2
SDI-12 Addresses ............................................................................................. 11
3.4.3
SDI-12 Commands............................................................................................ 11
3.5
RS-232 Operation ..................................................................................................... 14
3.5.1
RS-232 Wiring .................................................................................................. 14
3.6
RS-485 Operation ..................................................................................................... 15
3.6.1
RS-485 Wiring .................................................................................................. 15
3.7
RS-232 and RS-485 Settings .................................................................................... 16
3.7.1
BAUD Rate Setting........................................................................................... 18
3.7.2
Address ............................................................................................................. 19
3.7.3
Operational Mode Setting ................................................................................. 19
3.7.3.1
Measure in Poll Mode................................................................................ 19
3.7.3.2
Auto Measure Auto Output Mode ............................................................. 20
3.7.3.3
Auto Measure Polled Output Mode ........................................................... 20
3.7.4
Distance to Target or Depth .............................................................................. 20
3.7.5
Distance to Ground ........................................................................................... 21
3.7.6
Measurement Interval Units .............................................................................. 21
3.7.7
Measurement Interval Value ............................................................................. 21
3.7.8
Output Unit ....................................................................................................... 22
3.7.9
Quality Output .................................................................................................. 22
3.7.10
Temperature Output .......................................................................................... 22
3.7.11
Diagnostics Output............................................................................................ 22
3.8
Serial Commands ..................................................................................................... 22
3.8.1
Setup command ................................................................................................. 22
3.8.2
Poll command ................................................................................................... 23
3.8.3
Information command ....................................................................................... 23
3.8.4
Temperature Input command ............................................................................ 23
3.9
RS-232/RS-485 Data Output Format ....................................................................... 24
3.9.1
Measurement Output ......................................................................................... 24
3.9.2
Information Message Output ............................................................................ 26
4
Sensor Mounting and Installation ................................................................................... 28
4.1
Beam Angle .............................................................................................................. 28
4.2
Mounting Height ...................................................................................................... 28
4.2.1
Reference point ................................................................................................. 29
4.3
Mounting Options .................................................................................................... 29