... card ADT-8940 Function: Pulse output: Mode of pulse output: 4-channel pulse outputs, pulse/direction, pulse/pulse, maximum output frequency: ... or up/down pulse input of 4 axes A/B phase; Digital switch input: 40-channel optical coupling isolation input, every ... voltage: 5-24VIsolation voltage 2500VDC Digital switch output: 16-channel open-collector outputNPN open-collector, 5-24VDC, maximum current: ...