Motorola USB08 Betriebsanleitung PDF herunterladen (Seite 92)

Break Signal

The RS232 standard also specifies a signal called a Break, which is the sending of continuous Space

(logic 0) values (no Start or Stop bits). I believe the name dates from the days when many news

teleprinters used to be connected in series, and the break signal could be used to alert all machines that

an important announcement was pending. As noted above, it does not mean a physical break in the

connecting cable.

The Break signal must be of a duration longer than the time it takes to send a complete byte plus the

Start and Stop (and Parity, if any) bits. The minimum signal which will be considered a break at 9600

baud in 8-N-1 format is shown below:

Not all UARTs will reliably detect a break signal of the minimum length. This applies particularly to

USB-to-Serial adaptors.

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Motorola USB08 Betriebsanleitung Seite 92