Thanks. It can be seen here, it's just 8 bits, highest three are there called NR, so they were 011, lowest 4 were 0001 which means RR receive ready. https://ww

Thanks. It can be seen here, it's just 8 bits, highest three are there called NR, so they were 011, lowest 4 were 0001 which means RR receive ready. https://www.tapr.org/pub_ax25.html https://www.tapr.org/pub_ax25.html Fig. 7 -- S frame control fields