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Table of Contents
Summary of Contents for Greenspan SDI-12
- Page 1 SDI-12 Converter 4 - 20mA and RS232 Versions User Manual Version 1.03...
- Page 2 Technical Support When You Need It The correct choice of sensor should be supported by professional advice to ensure long term success in the field. Greenspan Technical Services is dedicated to customer support and provides assistance in the selection, installation, deployment and commissioning of sensors with a full range of consulting services.
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Page 3: Table Of Contents
INTRODUCTION Overview................…….… THE HARDWARE Converter Design................. SDI-100 (4-20mA)............………... SDI-200 (RS232, Smart))............. SDI-300 (RS232, Sonde)............…. Power Requirement.............………….. COMMUNICATIONS PROTOCOL SDI-12 Control Sequence............……. INSTALLATION Electrical Bus Connection............Wiring Connection to SDI-100..........…. Connection to SDI-200..............Connection to SDI-300..............General Installation............……... TROUBLESHOOTING..............………. 9 SPECIFICATIONS SDI-100/200/300 Specification............. -
Page 4: Introduction
Note that cable lengths from sensor to converter unit have been tested up to 300 metres and are not subject to the SDI-12 limit of 60 metres. The converter is packaged in a durable, robust, weatherproof housing and, depending on the model, is either hardwired or uses cable connectors for sensor connection and serial cable in/out. -
Page 5: Converter Design
The sensors used with this converter include microprocessor and logging capability, therefore data retrieval and control functions may be activated from the remote SDI-12 logger. It is not necessary to open this unit as all connections are external. UM-010-0012-SDI-12... -
Page 6: Sdi-300 (Rs232, Sonde)
The maximum load on the bus must be less than 500mA. Transient protection (against induced electromagnetic effects e.g., lightning) on both the SDI-12 serial lines and the +12V line is provided on all units. Supply polarity protection is provided by a polyfuse device and is auto resetting. -
Page 7: Communications Protocol
A typical recorder/sensor measurement sequence proceeds as follows: The data logger wakes all sensors on the SDI-12 bus with a break. Step 1. The logger transmits a command to a specific, addressed sensor, Step 2. -
Page 8: Installation
Sensor Figure 1, The SDI-12 Bus The maximum load that may be applied to the SDI-12 bus is 200K ohms when the transmitter is off and between 1K and 2K ohm when the transmitter is on. The ground line must be connected to the circuit ground and the earth ground at the data logger. -
Page 9: Wiring Connection To Sdi-100
The millipore filter attached to the vent tube for shipping can be used on the SDI-100 if desiccant packs are not required. Spare desiccant packs, (PVS100) are available from Greenspan for attachment to Luer fitting. Please refer to figure 3. - Page 10 Insert remaining cables through SDI In port and SDI Out port (for multiple connections any 4-6 mm OD, 3 core cable is suitable). Refer to Figure 2 for connection to terminal block. Tighten cable clamps on all three cable ports, replace top cover and tighten screws. UM-010-0012-SDI-12 GREENSPAN TECHNOLOGY...
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Page 11: Connection To Sdi-200
Ensure that cable lengths between units are no more than 60 metres (200ft). One advantage of Greenspan external SDI-12 Converter units is that sensor cable lengths can be much greater than the SDI-12 limit for installation in deep bore holes and remote locations. -
Page 12: Troubleshooting
PC and SDI-12 data logger. The cause of the problem will be with the PC/Data Logger and software setup OR in the first section of SDI-12 cable from the Data Logger to the first device on the network. -
Page 13: Specifications
1200 baud 1200 baud ---------------------------------------------------------------------------------------------------------- Address Range 00 to 09 00 to 09 ----------------------------------------------------------------------------------------------------------- Input 4-20mA RS232 ----------------------------------------------------------------------------------------------------------- Output SDI-12 SDI-12 ----------------------------------------------------------------------------------------------------------- Supply Voltage 9-15VDC 9-15VDC Reverse polarity protected and surge protected to 2kV ----------------------------------------------------------------------------------------------------------- Standby Current 10mA 10mA Comms Current... -
Page 14: Appendix
APPENDIX Specific instruction for setting up and testing of SDI-12 networks varies from logger to logger. However, an example for Campbell type logger CR-10 is included for reference. Model SDI-200/300 Setup • Install Campbell Logger software Tcom.exe. • Connect Smart Sensor/Sonde as appropriate to sensor input connector on SDI Converter. -
Page 15: Supported Converter Commands
SUPPORTED CONVERTER COMMANDS This table lists the commands supported by the Greenspan SDI-100 and SDI- 200/300 Converter units: Command Function Notes Address Query Fully Implemented Acknowledge Active Fully Implemented Send Identification Fully Implemented aAb! Change Address Fully Implemented aD0! Send Data...
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