is used to by the VU to send the signed RCDTData (i.e., the remote communication Data) to the DSRC-VU. The data will be sent every 60 seconds. The DataTransactionId parameter identifies the specific transmission of data. The LinkIdentifier is also used to ensure that the appropriate link is correct.
is sent by the DSRC-VU to provide the feedback to the VU on the reception of the data from a 
command identified by the DataTransactionId parameter. The Answer parameter is 1 (Success) or =0 (Failure). If a VU receives more than three answers equal to 0 or if the VU does not receive a RCDT Data Acknowledgment for a specific previously sent RCDT- Send Data with a specific DataTransactionId, the VU will generate and record an event.
is sent by the VU to DSRC-VU to terminate a link for a specific LinkIdentifier.