What is d-Tech?
d-Tech is a digital instrumentation platform developed by YieldPoint Inc. that embeds a microcomputer in every instrument so creating truly SMART geotechnical and structural instruments. The microcomputer performs tasks such as:
- Sensor excitation
- Sensor multiplexing
- A/D data conversion
- Temperature compensation
- Digital signal transmission (RS485).
- Provides a unique ID for every instrument.
d-Tech represents the modern approach to geotechnical instrumentation that enables clusters of instruments to be easily networked together using technologies such as Ethernet and wireless mesh. With simplicity comes lower cost especially with respect to implementation and maintenance. The advantages permeate to all aspects of data monitoring and management.
How we build geotechnical instruments
RS485 Output signal/Lead-wire
- The digital signals can be sent using RS485 over long distances, theoretically up to 1200m, but YieldPoint recommends less than 500m. Also, if severed, lead-wires can be twisted back together.
- Signals are transmitted on a balanced twisted pair of wires designated RS485-A and RS485-B.
Reading the d-Tech Instruments.
d-Reader is rugged hand held readout device with a back-lit LCD display.
YieldPoint's SensorViewer software can be used to read and store data on a Windows tablet. d-Tablet can also be used to download from d-Loggers.
d-Logger is a very simple data logger available in 1 instrument (d1Logger) or 4 instrument configurations (d4Logger). The data loggers require minimal configuration and can log data from any type of d-Tech instrument. Up to 10,000 readings can be stored in 32Mb of Flash memory. The data is downloaded to individual .txt files corresponding to each instrument ID e.g. 110321001.txt. If different instruments are plugged into the d-Logger during the same session the download process will write these to different files.
d-Mesh is a 900MHz wireless radio network based on Digi International's Xbee radio. The low cost radio nodes wirelessly enable a d4Logger.
The d-Tech Advantage
In summary d-Tech sensor architecture provides the following advantages over legacy analog geotechnical instrumentation systems:
- Improved Accuracy (i.e. Linearity, Temperature Compensation)
- Improved Reliability (e.g. non-contact technology, MEMS sensors)
- Output in Real World Units. All digital sensors have standard readout signal.
- Output signal includes unique SensorID+ SensorType
- Multiplex many channels on a single leadwire pair.
- Simplified low cost peripherals (e.g.data loggers)
- Simplified data transmission (Ethernet running TCP/IP,WiFi)
- Simpler data management