Dear Sir I had studied IEC 61850 standard and some relevant paper for relay communication purpose. As I came to know that we have to follow ISO/IEC 8802 -3 frame format for GOOSE. The last frame for this is APDU and this APDU is according to ASN.1 /BER encoding rules and having 13 labels as gocbRef, timeAlloedtoLive, datSet,goID,t,stNum,sqNum,test,confRev,ndsCom,numDatSetEntres,allData,se curity( IEC 61850). Sir I got confused what is numerical value of gocbRef as in papers and IEC61850 standard it is given in LLN0$gocb , what is numerical value of datSet i.e. data set and allData. What are different numerical values for these for different relays as overcurrent,distance etc. Sir can I check this complete frame with Wireshark software. Sir I am working on FPGA based relays in my research project and we are doing serial communication. Can we send this complete frame(after setting numerical values as I don't know ) in serial and convert it to ethernet and check the same on Wireshark. Sir kindly suggest me the numerical values for above mentioned and can I check the frame using above mentioned method.