Contec DIO-48DX-USB, Руководство пользователя

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5. Function
DIO-48DX-USB
33
Data I/O
I/O signals are TTL levels and positive logic.
Input
When input data is low level, [0] is input to the corresponding bit.
When input data is high level, [1] is input to the corresponding bit.
Output
When [0] is output to the corresponding bit, low level is output to the external part.
When [1] is output to the corresponding bit, high level is output to the external part.