Low-level packet I/O functions

API function	Description	RSLinx Classic	Interchange
DTL_PCCC_DIRECT	Sends a low-level PCCC message.	Not supported	Supported
DTL_PCCC_DIRECT_W	Sends a low-level PCCC packet and returns a callback.	Not supported	Supported
DTL_PCCC_DIRECT_CB	Sends a low-level PCCC packet and waits.	Not supported	Supported
DTL_PCCC_MSG	Sends a low-level PCCC message.	Supported	Supported
DTL_PCCC_MSG_W	Sends a low-level PCCC packet and waits.	Supported	Supported
DTL_PCCC_MSG_CB	Sends a low-level PCCC packet and returns a callback.	Supported	Supported

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