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Looks like NI expects you to interface with 4304 only using their breakout board - TB4304 is automatically added when I try to purchase 4304.
And as per the user manual, the RSVD pins on the connector enable the Driver to communicate with the accessory to auto-detect and configure certain stuff.
So, it is less likely you might get a PN for the connector to create your custom cabling or accessory.
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