Number of Bidirectional Digital Channels: 0. Digital I/O Isolation: 250 Vrms Ch-Earth Ground Isolation. Current Flow Direction: Sinking Input. Front Connection Type: Spring Terminal. Conformal Coated: No. Enclosed: Yes. Number of Digital Output Only Channels: 0. Number of Digital Input Only Channels: 8. Digital I/O Logic Levels: 12V, 24V. Maximum Update Rate: 1 us.