1. Data Signals and Collection

2. Data Types 2 types of output 2 types of output – Analogue Usually raw signal Usually raw signal Raw Voltage Raw Voltage – Digital Usually a calibrated signal Usually a calibrated signal RS-232 or RS-485 RS-232 or RS-485 Either way eventually it all needs to be digital for processing Either way eventually it all needs to be digital for processing

3. What is my digital output Communication types Communication types Serial Serial Ethernet Ethernet Data format Data format –Binary? –Hexadecimal? –ASCII? (decimal) For most cases this is the format you want to end up with For most cases this is the format you want to end up with –If not ASCII how and I going to get it to ASCII Converter program Converter program –All companies proved a converter program for their sensors data –Usually extract/convert data using datalogger program

4. Datalogger A datalogger is simply a device that record the data from a single or multiple sensors. A datalogger is simply a device that record the data from a single or multiple sensors. –Can be within the sensor or a separate device –Some sensors act as datalogging “hubs” Record auxiliary sensors on top of their own sensors Record auxiliary sensors on top of their own sensors –Example – SBE 19 Different dataloggers take different signals Different dataloggers take different signals

5. Datalogger Examples SBE CTD’s only takes Analogue signal SBE CTD’s only takes Analogue signal – Exception is SBE 19 plus V2 has one Digital input Wetlabs DH4 Wetlabs DH4 – Can be configured to costumer needs – Up to 8 Digital ports – Up to 4 analogue ports Other companies have dataloggers you can interface with Other companies have dataloggers you can interface with – These are the two we have at USM

6. Questions for deciding what signal/sensor you need What What –What data do you really need Calibrated Concentration Calibrated Concentrationor Change in signal Change in signal –Calibration not needed

7. Change only?

8. Calibrated Concentration What concentration range What concentration range –Sensors are calibrated for different ranges 0-50ug/L or 0-500ug/L 0-50ug/L or 0-500ug/L What type of Feature Identification What type of Feature Identification –Microscale –Macroscale

9. Data Rates Frequency Frequency –Hertz (Hz) Cycles per second Cycles per second What can the sensor do? What can the sensor do? What can the datalogger do? What can the datalogger do? http://en.wikipedia.org/wiki/Hertz

10. Black is Contros CO2 sensor with a response time ~ 1min

11. http://www.amloceanographic.com/Portals/0/Ref_Pics/Graphs/actual%20vs%20measured.jpg

12. Sample Rate vs Response time Sample Rate Sample Rate –The number of samples, or readings, persecond of an analogue signal Response time Response time –Time a system takes to respond to a given input Time between software sending a message and instrument sending a reply Time between software sending a message and instrument sending a reply Not always the same for some sensors Not always the same for some sensors

13. What if your sample rate is not what you need? Find a different sensor Find a different sensor –Not always easy with newer specialized sensors Not many companies making them Not many companies making them Talk to the company about modifying the sensor Talk to the company about modifying the sensor –Ask for an analogue out and make your own datalogger

14. How does the sensor send the data As soon as the sensor is powered on As soon as the sensor is powered onor Need to interrogate the sensor for a signal return Need to interrogate the sensor for a signal return –If so what signal do you need to send it –Can your datalogger send signals or just listen Commands are usually binary or hexadecimal Commands are usually binary or hexadecimal

15. ECO BB9 - Wetlabs Will our sensor work? Read the Specifications for the instruments and data logger Read the Specifications for the instruments and data logger

17. Will our Sensor work? Just because the specification do not show the output you need doesn’t mean the sensor is incapable of that output. Just because the specification do not show the output you need doesn’t mean the sensor is incapable of that output. – Talk to the company

18. Sensor pin outs

19. Wiring cables

20. DB9 Connector – Serial Comms Pin 2 – RX Pin 2 – RX Pin 3 – TX Pin 3 – TX Pin 5 - GND Pin 5 - GND

21. Ordering plugs What can you order What can you order – Pigtails – Whole cables – Dummy plugs Don’t forget the locking collar!! Don’t forget the locking collar!! – Pigtails and Dummy plugs Every company makes the other company cables Every company makes the other company cables

22. How to order the correct cable? www.impulse-net.com www.impulse-net.com