The NI 948x is a digital output relay module controlled with boolean commands. When a True value is written to a channel, the relay is closed and the terminal that is connected to the load allows current to flow or allows voltage to be applied to the load. When a False value is written to a channel, the switch opens, disconnecting the circuit so no current flows and no voltage is applied to the load. This article will go through programming a C Series Relay Output Module
with DAQ Assistant and the DAQmx LabVIEW API. Each example details closing the relay on channels 0-2 and opening the relay on channel 3.