The NI ‑ 9425 uses industrial logic levels and signals so it can be connected directly to a wide variety of industrial switch modules, converters, and other devices. Each digital input channel is compatible with 24 V logic levels. The NI ‑ 9425 has isolation between the input and output banks and resistance isolation from channel to ground. The NI ‑ 9425 cannot be used for counter operations in a CompactDAQ chassis.
 Product features:
-  Number of pure digital input channels: 32
-  Number of pure digital output channels: 0
-  Number of bidirectional digital channels: 0
-  Logic level of the digital I / O: 12 V 24 V.
-  Maximum update rate: 7 µs
-  Current flow direction: Current sinking input
-  Isolation of the digital I / O: 250 Veff Isolation of the channel from ground
-  Connection type front: spring terminal
-  Protective coating: no
-  With housing: yes
-  Supported hardware platform: CompactDAQ, CompactRIO