5 V/TTL, 32 bidirectional channels, 7 µs C-Series digital module – The NI-9403 is a configurable digital I/O interface that enables dynamic shifting of input or output. Each channel has a transient isolation between the I/O channel and the backplane. With reconfigurable I/O (RIO) technology (CompactRIO only), the NI-9403 can be programmed using the LabVIEW FPGA module for applications such as custom high-speed counters/timers, digital communication protocols, and pulse generation. In the CompactDAQ chassis, the NI-9403 is only available as a static (software timed) digital I/O module. These modules cannot be used to route timing or trigger signals.