Finding characters per sec using asynchronous mode

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How many characters per sec(7bits+parity) can be transmitted over 2400bps line in asynchronous mode.

I calculated it to be 300 but the book says it is 240....how?

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Bud Ward On BEST ANSWER

Asynchronous mode uses start and stop bits. Start_bit + 7 Data_bits + Parity_bit + Stop_bit = 10 bits / character. (2400 bits / second) / (10 bits / character) = 240 characters / second.