Starting SDI-12 Network Communications          

To activate the SDI-12 output port  on the VibWire-108-SDI12.      

1. Starting at              




     

         

2. Select “Menu In”  button

3. Use the Up & Down Keys to select the option “Seral”

“Analg C0d C1d C2d C3d C4d C5d C6d C7d” are the other options available

Once the “Seral” output is selected the “Menu Out” key has to be pressed to confirm this option.

4. The VW-108 will return to the display



 
 



 and now the SDI-12  port for  the instrument is now activated.

Examples Of  Using  SDI-12 Instructions

The following examples show how to undertake the various tasks needed to setup and make readings across the  SDI-12 networks.

The SDI-12 networks only supports up to 10 instruments with address range: 0 to 9 so a single Campbell instrument can read up to 80
vibrating wire sensors using the VibWire-108 interface.

Changing the ID Number (address)

The following example demonstrates how to change the instrument ID number from the default factory setting 0 to 5.

Use the command ‘aAb’    where a = Start ID  b = Final ID

master sends:  ‘0A5’   Instrument responds 5\r\n    Return New Line   (5 representing new ID number)


Start Measurements On Distributed Instruments Upon A Network

The following example shows how to start measurements on instruments with ID numbers 2, 7, and 9 respectively.  

For this example the instruments are instructed to start readings one at a time and the network is not freed up until each instrument responds that the readings are being undertaken.

The instruments will start their measurement operations but will not send data across the network until instructed to do so.

Use the command ‘aM!’    where a = Instrument ID Number  

master sends:  ‘2M!’   Instrument responds          ‘20608\r\n’      indicated readings available after 60 secs
                 
followed by      ‘2\r\n’              when the measurement is completed

          7M!                                               ‘70608\r\n’
         ‘7\r\n’

          9M!                                                ‘90608\r\n’
         ‘9\r\n’


Instrument Identifier

Each instrument deployed on the SDI-12 multi-drop network  must have a unique instrument identifier set in order to  identify

For the SDI-12 network this  identifier is 0-9.

specific instrument on the network.

 See below for details on setting the ID number.
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