The control codes felt essential for data transmission were the start of message (SOM), end of address (EOA), end of message (EOM), end of transmission (EOT), "who are you?"
ðə kəntɹˈoʊl kˈoʊdz fˈɛlt ᵻsˈɛnʃəl fɔːɹ dˈeɪɾə tɹænsmˈɪʃən wɜː ðə stˈɑːɹt ʌv mˈɛsɪdʒ ˌɛsˌoʊˈɛm, ˈɛnd ʌv ɐdɹˈɛs ˌiːˌoʊˈeɪ, ˈɛnd ʌv mˈɛsɪdʒ ˌiːˌoʊˈɛm, ˈɛnd ʌv tɹænsmˈɪʃən ˌiːˌoʊtˈiː, "hˈuː ɑːɹ juː?"