The Digital Adapter is required to connect digital ScienceWorkshop sensors to PASPORT interfaces. Each Digital Adapter has two digital ports that can accommodate two single-channel, or one dual-channel digital sensor at once. Each port on the Digital Adapter automatically detects a connection and initiates a selection of pre-configured or user-defined options. Several Digital Adapters can be used simultaneously when required.
https://www.pasco.com/products/sensors/science-workshop/ps-2159#specs-panel
