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Initial States

At power-on, the I/O lines are in the following state:

Differential Inputs

LineInverter = False

LineFilterStrength = Low

TTL Inputs/outputs

LineMode = Input (The line is not driven)

LineInverter = False

LineFilterStrength = Low

Isolated Inputs

LineInverter = False

LineFilterStrength = Low

Isolated Outputs

LineInverter = False

LineFilterStrength = Low

The opto-coupler is OFF.