Connecting the DT80 to SDI-12 Devices
The DT80's tri-stateable digital I/O channels ( 5D-8D on DT80, 4D on DT81) can be used to control up to four SDI-12 buses. Up to ten VibWire-108-SDI-12 interface units can be connected to each bus.
As shown in Figure 3, an SDI-12 bus is connected to the DT80 as follows:
The SDI-12 DATA line connects to one of the digital I/O terminals 5D – 8D (4D for DT81)
The SDI-12 GROUND line connects to the D GND terminal
The SDI-12 POWER line is typically connected to the DT80's external power input terminal (+), or alternatively a separate 12V DC supply can be used.
When connecting a VibWire-108 to the DT80 for the first time, it's best to connect only to a single interface, ie. you should temporarily disconnect any other sensors on the same SDI-12 bus. This ensures there will be no address conflicts.
Testing and Configuring a VibWire-108-SDI-12 Device
By default the ID number of a factory ready VibWire-108 and unless otherwise stated with the documentation is ID = 0.
All the VibWire-108-SDI-12 interfaces act as full SDI-12 slave units and so support at least ten different addresses. The interface ID number can be changed manually using the User Keys mounted on the instrument or remotely using SDI-12 commands issued from the logger unit.
If only a single VibWire-108-SDI12 is to be connected to any of the SDI-12 ports on the DT80 at any one time then the factory set ID number need not be changed.
Setting the ID number using the User Keys
To activate the real-time frequency display
1. Starting at
The “Basic” menu item is the first menu item available after the instrument is powered on and can also be accessed by
pressing the “Menu In” key at any time in the instrument operations.
2. Select “Up” and “Down” button until ID menu item is illuminated the
Other Menu options that appear as the “Up” and “Down” keys are pressed are DISP PEROD TRa etc..
menu item is displayed.
3. Select the “Menu In” key and the instrument ID number will be displayed. 0 being the default ID
Use the “Up” and “Down” keys to alter the Id number from 0 to 9.
Once the new ID number is set press the “Menu Out” key to confirm the option
The new ID number can now be used to access information from the VibWire-108 interface.
