Checking which package is being sent at the moment

[Maximinus]

Greetings,

I have question about "Packet-based Digital Link" - is there a way to see which packet is being sent right now? And if yes how to do it (I assume I must modify the transmitter VI but I don't know how)? How can I calculate the Packet Error Rate for them?

Also, is there a way to find the error rate in the packet transmission? How can I add BER and CRC to this receiver? 

Thank you in advance!