National Instrument NI9401, 8 Bidirectional Channels, 100 ns C Series Digital ModuleCondition:* Used, Removed From Service In Working Condition. Unable to test. As pictured. Additional Notes:* Number of Bidirectional Digital Channels: 8* Current Flow Direction: Sinking Input, Sinking Output, Sourcing Input, Sourcing Output* Enclosed: Yes* Digital I/O Logic Levels: 5 Volt TTL* Digital I/O Isolation: 60 Volt DC Ch-Earth Ground Isolation* Front Connection Type: D-SUB* Number of Digital Input Channels: 0* Number of Digital Output Only Channels: 0* Maximum Update Rate: 100 ns* Supported Hardware Platform: C SeriesNational Instrument NI9401