2.8.1 - Typical Digital I/O Connections [U6 Datasheet] Subsections 2.8.1.1 - Input: Driven Signals [U6 Datasheet] 2.8.1.2 - Input: Open-Collector Signals [U6 Datasheet] 2.8.1.3 - Input: Mechanical Switch Closure [U6 Datasheet] 2.8.1.4 - Output: Controlling Relays [U6 Datasheet]
