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Callback Function Matlab Serial Number



configureCallback(device,"terminator",callbackFcn) sets the callback function callbackFcn to trigger whenever a terminator is available to be read from the specified serial port. The syntax sets the BytesAvailableFcnMode property of device to "terminator" and the BytesAvailableFcn property to callbackFcn.




callback function matlab serial number


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configureCallback(device,"byte",count,callbackFcn) sets the callback function callbackFcn to trigger whenever a new count number of bytes are available to be read. The syntax sets the BytesAvailableFcnMode property of device to "byte", the BytesAvailableFcnCount property to count, and the BytesAvailableFcn property to callbackFcn.


Terminator character for reading and writing ASCII-terminated data, returned as "LF", "CR", or "CR/LF", or a number from 0 to 255, inclusive. If the read and write terminators are different, Terminator is returned as a 1x2 cell array of these values. Set this property with the configureTerminator function.


Bytes available callback trigger mode, returned as "off", "byte", or "terminator". This setting determines if the callback is off, triggered by the number of bytes specified by BytesAvailableFcnCount, or triggered by the terminator specified by Terminator. Set this property with the configureCallback function.


Number of bytes of data to trigger the callback specified by BytesAvailableFcn, returned as a double. This value is used only when the BytesAvailableFcnMode property is "byte". Set these properties with the configureCallback function.


Callback function triggered by a bytes available event, returned as a function handle. A bytes available event is generated by receiving a certain number of bytes or a terminator. This property is empty until you assign a function handle. Set this property with the configureCallback function.


You configure BytesAvailableFcn to executea callback function when a bytes-available event occurs. A bytes-availableevent occurs when the number of bytes specified by the BytesAvailableFcnCount propertyis available in the input buffer, or after a terminator is read, asdetermined by the BytesAvailableFcnMode property.


Some properties can be set during object creation with the serial function. See the serial reference page for information about those properties, which include Port, BaudRate, ByteOrder, DataBits, Parity, StopBits, and Terminator.


Communication properties are used to set data bit transfer settings. Read and write properties are used to configure factors involved in the reading and writing of data, such as setting a timeout for completing the operation. Use callback properties to execute callback functions from events. Use control pin properties to configure the state of control pins and data flow control. Use recording properties to set up and control recording information to disk.


Label to associate with a serial port object, specified as a character vector or string. Tag uniquely identifies a serial port object. Tag is particularly useful when constructing programs that would otherwise need to define the serial port object as a global variable, or pass the object as an argument between callback routines.


Data you want to associate with a serial port object, specified as a MATLAB array. Configure UserData to store data that you want to associate with a serial port object. The object does not use this data directly, but you can access it using the get function or the dot notation.


Objects that are not visible are still valid. If you have access to the object (for example, from within the file that creates it), you can set and get its properties and pass it to any function that operates on serial port objects.


In addition to the data bits, the serial data format consists of a start bit, one or two stop bits, and possibly a parity bit. You specify the number of stop bits with the StopBits property, and the type of parity checking with the Parity property.


In addition to the parity bit, the serial data format consists of a start bit, between five and eight data bits, and one or two stop bits. You specify the number of data bits with the DataBits property, and the number of stop bits with the StopBits property.


In addition to the stop bits, the serial data format consists of a start bit, between five and eight data bits, and possibly a parity bit. You specify the number of data bits with the DataBits property, and the type of parity checking with the Parity property.


Number of bytes available in the input buffer, specified as a double. This read-only property indicates the number of bytes currently available to be read from the input buffer. The property value is continuously updated as the input buffer is filled, and is set to 0 after the fopen function is issued.


You can configure InputBufferSize only when the serial port object is disconnected from the device. You can configure it before calling the fopen function. You disconnect an object with the fclose function. A disconnected object has a Status property value of closed.


Specify whether an asynchronous read operation is continuous or manual, specified as 'manual' or 'continuous'. If ReadAsyncMode is continuous, the serial port object continuously queries the device to determine if data is available to be read. If data is available, it is automatically read and stored in the input buffer. If issued, the readasync function is ignored.


Total number of values read from the device, specified as a double. This is a read-only property, and the value is updated after each successful read operation and set to 0 after the fopen function is issued. If the terminator is read from the device, then this value is reflected by ValuesReceived.


Number of bytes currently in the output buffer, specified as a double. This read-only property indicates the number of bytes currently in the output buffer waiting to be written to the device. The property value is continuously updated as the output buffer is filled and emptied, and is set to 0 after the fopen function is issued.


You can configure OutputBufferSize only when the serial port object is disconnected from the device. You can configure it before calling the fopen function. You disconnect an object with the fclose function. A disconnected object has a Status property value of closed.


Total number of values written to the device, specified as a double. This is a read-only property, and the value is updated after each successful write operation and set to 0 after the fopen function is issued. If you are writing the terminator, ValuesSent reflects this value.


Callback function to run when break-interrupt event occurs, specified as a function handle. A break-interrupt event is generated by the serial port when the received data is in an off (space) state longer than the transmission time for one byte.


Callback function to run when bytes-available event occurs, specified as a function handle. A bytes-available event occurs when the number of bytes specified by the BytesAvailableFcnCount property is available in the input buffer, or after a terminator is read, as determined by the BytesAvailableFcnMode property.


Type of bytes-available function to generate a bytes-available event, specified as 'terminator' or 'byte'. If BytesAvailableFcnMode is 'terminator', a bytes-available event occurs when the terminator specified by the Terminator property is reached. If BytesAvailableFcnMode is 'byte', a bytes-available event occurs when the number of bytes specified by the BytesAvailableFcnCount property is available.


Callback function to run when a pin status event occurs, specified as a function handle. A pin status event occurs when the Carrier Detect (CD), Clear to Send (CTS), Data Set Ready (DSR), or Ring Indicator (RI) pin changes state. A serial port pin changes state when it is asserted or unasserted. Information about the state of these pins is recorded in the PinStatus property.


Callback function to run when a timer event occurs, specified as a function handle. A timer event occurs when the time specified by the TimerPeriod property passes. Time is measured relative to when the serial port object is connected to the device with fopen.


Period of time between timer events, specified as a number in seconds. It is the time that must pass before the callback function specified for TimerFcn is called. Time is measured relative to when the serial port object is connected to the device with fopen.


Status of recording serial data and event information, returned as on or off. This read-only property indicates whether recording is on or off, which is controlled by the record function. If RecordStatus is off, then data and event information are not saved to a record file. If RecordStatus is on, then data and event information are saved to the record file specified by RecordName.


lh = addlistener(session,'DataAvailable',callbackfct); creates a listener for the DataAvailable event. When data is available to process, the callback executes. The callback can be any MATLAB function with the (src,event) signature.


lh = addlistener(session,'DataAvailable',@(src,event)expr) creates a listener for the DataAvailable event and fires an anonymous callback function. The anonymous function requires the specified input arguments and executes the operation specified in the expression expr. Anonymous functions provide a quick means of creating simple functions without storing your function in a separate file. For more information see Anonymous Functions.


The callback has two required parameters: src and event. src is the session object for the listener and event is a daq.DataAvailableInfo object containing the data associated and timing information. Properties of daq.DataAvailableInfo are:DataAn m-by-n matrix of doubles where m is the number of scans acquired, and n is the number of input channels in the session.


Event Types and Callback PropertiesThe serial port event types and callback properties are described below.Table 8-9: Event Types and Callback Properties Event TypeAssociated PropertiesBreak interruptBreakInterruptFcnBytes availableBytesAvailableFcnBytesAvailableFcnCountBytesAvailableFcnModeErrorErrorFcnOutput emptyOutputEmptyFcnPin statusPinStatusFcnTimerTimerFcnTimerPeriod 350c69d7ab


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