I am trying to understand which protocols can be decoded by the Logic Analyzer on the Virtual Bench.
The Digital I/O allows you to choose between I2C, SPI, and Parallel. That last one is related to General-purpose I/O (GPIO).
To get more information about the usage of the Digital I/O, you can check this section of the NI Virtual Bench Help.
Announcing free firmware update - version 1.1 adds SPI and I2C protocol analysis
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