NAME
    Stop -- pause all current I/O over the serial port

FUNCTION
    This command halts all current I/O on the serial port by
    sending an xOFF to the "other side", and submitting a "logical
    xOFF" to "our side", if/when appropriate to current activity.

IO REQUEST
    io_Message      mn_ReplyPort initialized
    io_Device       set by opendevice
    io_Unit         set by opendevice
    io_Command      CMD_STOP

RESULTS

SEE ALSO
    serial.device/cmd_start