The C1701 Relay Kit provides the ability to use a Campbell Scientific Datalogger to switch power to sensors and controls with high current requirements (up to 7 amps). The C1701 has four connections that are wired to provide isolated switching of a load using a datalogger control port.
The control port and datalogger ground are input to the relay and the load circuit is the relay output To activate the load circuit, the control port to which the relay is connected should be set to high (5V) using an appropriate datalogger program control instruction. To turn the load circuit off, toggle the control port low (0V) using a similar instruction.