SDI-12 data signal is connected
common to all units
common to all units
12V DC
Gnd
SLAVE - 2
Connecting the VibWire-108 to Campbell CR200 Loggers
The Campbell CR200 range of loggers can be configured to read sensor information from the VibWire-108 -SDI12 simply by using the digital SDI-12 serial communications port. The number of vibrating wire sensors to be scanned is configured within he VibWire-108 leaving the CR200 to only control the power supply and make the sample readings. All sensor inputs are gas discharge protected making the VibWire-108 and ideal partner to operate with the CR200 in the field. Simply install the sensors, power up and start recording values.
Sensor Scanning & Power Supply Options
The Campbell CR200 can be configured to use the SWBatt switched power supply option to power on the VibWire-108 as shown for SLAVE-1 below. Before this can be activated the VibWire-108 must be correctly configured to transmit data using the SDI-12 serial port. Activating the SDI-12 port on the VibWire-108 is the only configuration parameter needed to enable the instrument to operate with the CR200. The switched battery operation enables the instrument to be driven directly from the logger and powered off between readings.
The Campbell CR200 range of loggers can be configured to read sensor information from the VibWire-
Sensor Scanning & Power Supply Options
The Campbell CR200 can be configured to use the SWBatt switched power supply option to power on the VibWire-
Pin-out Comms Port
SLAVE-1 instrument
is configured to run directly from the CR200 with the data logger providing power for the logger and the VibWire-108. .
SLAVE-2 is connected to the CR200 using only the SDI-12 serial port. An external 12V DC supply and Ground connection is all that is required to additional sensor channels .
Low Power Operations
Use the Switch Battery supply on the CR200 minimises the power required since the VibWire interface is only powered on when a reading is needed and then powered of in between readings.
Programming & Software
The CR200 communicates to the VibWire-108-SDI12 like any other slave device and so the software shown in the CR200 manual for SDI-12 operations is fully compatible to the instrument.
Additional instrument remotely
powered.
powered.
The Campbell CR800 Logger is manufactured by Campbell Scientific USA
see http://www.campbellsci.co.uk
The wiring diagram shows the SDI-12 port on the CR200 and the VibWire-108 connected together. The scan rate of the VibWire is controlled by simply powering on the device and waiting for the instrument to complete the sensor scan