A library to use an Arduino as a master to control and communicate via modbus with the pressure and water level sensors produced by In-stru.
This library depends on the EnviroDIY/SensorModbusMaster library or the forker version https://github.com/neilh10/InsituModbus The In-situ EnviroDIY/ModularSensor library functions for depend on this library.
This library implements a small subset of functions from those described in the In-Situ Modbus Communication Protocol Version 5.10l. These are:
getSerialNumbergetValues, for presssure and temperature
The In-Situ instrument must be changed to 9600 baud from the default 19200
The function code
0x03 Read Holding Registers 2.3.1.4 all registers are Holding Registers
0x11 (17) Report Device(Slave) Id 2.3.1.8
The device register maps are in sections
Exception Codes - Appendix A
Device Ids - Appendix B ~ LT500=1
Sensor Ids - Appendix C ~
1 "Temperature"
2 "5 PSI"
Parameter Ids - Appendix D
Unit Ids - Appendix E 0 None 1-3 Temperature 1 Celsious
33-38 Length 35 - m 37 - inches 38 - feet
Holding Registers (1 based, in packets 0-37, 37-44,45-52,53-61) 1-38 Sensor Common Registers 38-45 Parameter 1 Registers 46-53 Parameter 2 Registers 54-62 Parameter 3 Registers See Sect 6 Probe Common Registers (9000) Std across In-Situ
This library also calculates water depth via the following function:
calcWaterDepthM, based on water pressure and temperature-dependency on water density, following equation 6 from JonesHarris1992-NIST-DensityWater.pdf.
Software sketches and code are released under the BSD 3-Clause License -- See LICENSE.md file for details.
Documentation is licensed as Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA) copyright.
EnviroDIY™ is presented by the Stroud Water Research Center, with contributions from a community of enthusiasts sharing do-it-yourself ideas for environmental science and monitoring.
Neil Hancock is the primary developer of this library.
This library is based on
Anthony Aufdenakmpe's KellerModbus
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