Number of Bidirectional Digital Channels: 8. Digital I/O Isolation: 60 VDC Ch-Earth Ground Isolation. Current Flow Direction: Sinking Input, Sinking Output, Sourcing Input, Sourcing Output. Front Connection Type: D-Sub. Conformal Coated: No. Enclosed: Yes. Number of Digital Output Only Channels: 0. Number of Digital Input Only Channels: 0. Digital I/O Logic Levels: 5V TTL. Maximum Update Rate: 100 ns.