Copyright 2006 - 2007 Keynes Controls Ltd
12V DC
12V DC
Gnd
Gnd
SLAVE
SLAVE
SDI-12 data signal is connected common to all units
The following pages details how to connect the Datataker DT80 logger to the VibWire-108 family of vibrating wire sensor interfaces using SDI-12 serial network and analogue input ports available within the logger. This information sheet is based upon the User having prior knowledge of the configuration of the DT80 and for programming data acquisition operations using the SDI-12 command set.
Even though this document is aimed at users of the DT80 data logger unit any other Datataker product supporting SDI-12 operation will work and be configured in exactly the same way.
Even though this document is aimed at users of the DT80 data logger unit any other Datataker product supporting SDI-
SDI-12 Serial Network Operation
Each VibWire-108 must have a unique identifier set in order that the logger unit can correctly identify the information from a specific interface.
The DT80 operates as the SDI-12 Master and issues commands to the units across SDI-12 network. Care must also be taken to ensure a good system earth in order to ensure that the lightening protection will operate.
Figure 1 shows the VibWire-108 daisy chained onto a single SDI-12 network. The DT80 must read data from each instrument in turn along the chain in order to get information from all sensors.
Fig 1
Download the VibWire-108 User manual at http://keynes-controls.com/vibwire/usermanualv103.pdf
Download this document at http://keynes-controls.com/vibwire/Datatakerv102.pdf
Download this document at http://keynes-
Operations
The VibWire-108 can be supplied with SDI-12 and an analogue output port making it ideally suited for integration to the DT80 logger.
The complete process of reading a signal from a Vibrating wire sensor to storage within the DT80 is a purely a digital operation when using the SDI-12 network. Up to 40 instruments making 320 vibrating wire sensors and analogue inputs can be can be connected to the DT80 across this interface.
The standard SDI-12 commands shown within DT80 manual are compatible to reading data and configuring the VibWire-108 across the network. Refere to the DT80 manual for programming examples.
The VibWire-108 family of products support models having analogue output representation of the sensor input signals and these can be connected to any analogue data acquisition system including the DT80.
The User keys on the instrument enable the operator to locally configure the instrument and make any in the field changes to operations including the assigning the real-time display and changing the ID number.