Digital Inputs And Counter/Timer Inputs - Data Translation DT3010 Series Getting Started Manual

Digital Inputs and Counter/Timer Inputs

TTL-type inputs must have current limiting so that circuitry is not
damaged when power is removed. On all Data Translation PCI
boards, current limiting is used to prevent damage in this fault
condition.
On high-speed clock inputs, a ground that is located in the connector
next to the clock must be connected as a twisted pair with the
high-speed clock input.
Using Your Own Screw Terminal Panel
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