MATLAB: How to receive multiple inputs from the RS232 Asynchronous Receive block in xPC Target 2.7.1 (R14SP1)

asynchronousframeoutputportsreceivers232Simulink Real-Time

I want to send more than one output from the RS232 Asynchronous Receive block. I have my "RS232_Receive(1).RecData" so that it is set to receive three variables as follows:

RS232_Receive(1).RecData = '%f,%f,%f\r';

My RS232_Receive(1).OutputPorts variable is currently set to:

RS232_Receive(1).OutputPorts = [1]

Once I receive an input frame I want to separate out the three floating point numbers received. And I want to treat them as three separate variables and view the values of these variables on the xPC target scope. However I am just able to see the last floating point value on the xPC scope. How do I view all of these values on the scope?

Best Answer

This enhancement has been incorporated in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:

Documentation on the RS232 Asynchronous Receive block in xPC Target is missing information on how to receive multiple inputs.

To receive multiple inputs from RS232 Asynchronous Receive block , set RS232_Receive(1).OutputPorts so that it reads:

RS232_Receive(1).OutputPorts = [1 2 3]

This allows for three output ports as specified by [1 2 3]. This feeds the ports as follows:

1. Feeds first %f data from the RecData to output port 1

2. Feeds second %f data from the RecData to output port 2

3. Feeds third %f data from the RecData to output port 3

At this point, you can combine the signals from the 3 output ports together to send to a scope using a Mux block.

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MATLAB: How to verify that the Serial Transmit block sends correct data to the serial port when using Embedded Target for Motorola MPC555 2.0.2 (R14SP2)

You can use Infineon's "MiniMon" utility to monitor the serial port of your board. This software download is available at the following URL:

http://www.infineon.com/minimon

You can also monitor the serial port using Hyperterminal using a baud rate of 9600, no parity, 1 stop bit, appropriate data bits, and no flow control. However, please note that Hyperterminal interprets the data as ASCII symbols.

MATLAB: Is there a documentation error on pages 1-22 and 1-35 of the xPC Target 2.0 (R13) I/O Reference Guide

This error has been forwarded to our documentation staff to be reviewed for a future release of xPC Target I/O Reference Guide.

On page 1-22, the documentation should read as follows:

 RS232_Receive(1).OutputPorts = [1 2];
 ......
 RS232_Receive(1).EOM = 1;

Because two floating-point numbers will be received, the number of the OutputPorts should be same as the number of received data.

On page 1-35, the documentation should read:

 EOM      Number of characters you use to indicate the end of a message.

For example, if each line of your data ends with '\r\n', you should set the EOM to 2 in the message structure as follows:

RS232_Receive(1).EOM = 2;

Best Answer

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MATLAB: How to verify that the Serial Transmit block sends correct data to the serial port when using Embedded Target for Motorola MPC555 2.0.2 (R14SP2)

MATLAB: Is there a documentation error on pages 1-22 and 1-35 of the xPC Target 2.0 (R13) I/O Reference Guide

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