Number of Bidirectional Digital Channels: 0. Digital I/O Isolation: 60 VDC Ch-Earth Ground Isolation. Current Flow Direction: Sinking Input. Front Connection Type: D-Sub. Conformal Coated: No. Enclosed: Yes. Number of Digital Output Only Channels: 0. Number of Digital Input Only Channels: 6. Digital I/O Logic Levels: 12V, 24V, 5V, 5V TTL, RS-422. Maximum Update Rate: 500 ns.