allows a considerable improvement of the error detection probability. USASCII characters are also transmitted using ''odd parity'' for additional checking.

Pad characters are required following a line turn-around—NAK, EOT, ENQ, ACK0, ACK1. If the transmission ends with EOT or ETX the pad follows the BCC. This pad is either all '1' bits or alternating '0' and '1' bits. The next transmission begins with a pad character which can be either of the above or a SYN.

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