serial.device/SDCMD_BREAK

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 NAME
 Break -- send a break signal over the serial line
 FUNCTION
 This command sends a break signal (serial line held low for an
 extended period) out the serial port. For the built-in port,
 This is accomplished by setting the UARTBRK bit of regisrer ADKCON.
 After a duration (user specifiable via setparams, default 250000
 microseconds) the bit is reset and the signal discontinued.
 If the QUEUEDBRK bit of io_SerFlags is set in the io_Request
 block, the request is placed at the back of the write-request
 queue and executed in turn. If the QUEUEDBRK bit is not set,
 the break is started immediately, control returns to the
 caller, and the timer discontinues the signal after the
 duration is completed. Be aware that calling BREAK may
	affect other commands such as ABORT, FLUSH, STOP, START, etc...
 IO REQUEST
 io_Message mn_ReplyPort initialized
 io_Device set by OpenDevice
 io_Unit set by OpenDevice
 io_Command SDCMD_BREAK
 io_Flags set/reset IO_QUICK per above description
 RESULTS
 Error -- if the Break succeded, then Error will be null.
 If the Break failed, then the Error will be non-zero.

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