Logic Families
The NI 654x Acquisition and Generation Logic Families can be independently set to one of four values: 1.8 V Logic, 2.5 V Logic, 3.3 V Logic, and 5.0 V Logic. The actual voltage levels defined by these logic families are defined in the NI 654x specifications.
Setting the Generation Logic Family determines the generation voltage levels (Generation Voltage High and Low) for the device. The NI 654x generates these voltages for a 1 (Generation Voltage High) or a 0 (Generation Voltage Low). The following diagram clarifies the physical meaning of generation voltage level specifications.
Setting the Acquisition Logic Family determines the acquisition voltage levels (Acquisition Voltage High and Low) for the device. An acquired voltage below Acquisition Voltage Low is read as a 0, a voltage acquired above Acquisition Voltage High is read as a 1.
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Note Any acquired voltage between Acquisition Voltage Low and Acquisition Voltage High cannot be guaranteed to be read as a 1 or a 0. In the following figure, these samples are shown as an X, indicating that the acquired value is unknown. |
The following diagram illustrates the physical meaning of the acquisition voltage level specifications.
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