5 May 2015

RTTY ASCII



For ASCII mode standard baud rates from 110 to 300 Baud are available but non-standard baud rates may be selected. The ASCII code, which is internationally adapted as the CCITT ITA-5 alphabet, is used in all kinds of data transfer of information between computers or computer based equipment. Only the 7 bit values 0–127 are internationally defined and standardized. 


For asynchronous transmissions, the code consists of a start bit, 7 or 8 data bits, one parity bit (optional) and 1 or 2 stop bits. Frame lenght is 50 msec, then baudrate = (50/10)=5 and 1000/5 = 200.


Note the different structure of the frame in case of a RTTY Baudot (below):



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