MATLAB XPC TARGET 4 - DEVICE DRIVERS Dokumentacja Pobierz pdf (Strona 88)

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3 GPIB I/O Support

3-22

GPIB_Message(1).RecData = ’%f%d’;

GPIB_Message(1).OutputPorts = [1 -1];

The code %d reads the length of data and the -1 discards the length. Using the

modified xPC Target

rd command, you would write

GPIB_message(1).Command = ’rd #20 16’;

GPIB_message(1).RecData = ’%f’;

GPIB_message(1).OutputPorts = [1];

Automatic Addition of Escape Characters - The message interpreter

automatically places the correct escape characters at the end of the message

fields

.Command, .SendData, and .Ack. However, if you add the escape

characters, then the message interpreter does not add additional characters.

The escape characters that are:

\\, \a, \b, \f, \r,\t, \v, \’, \’’, and \n.

For example, you can write

GPIB_Message.Command = ’wrt 16\n’;

GPIB_Message.SendData = ’:conf:volt:dc\r’;

GPIB_Message.Ack = ’10\n\r’;

or you can write the following, and the appropriate escape characters are

added.

GPIB_Message.Command = ’wrt 16’;

GPIB_Message.SendData = ’:conf:volt:dc’;

GPIB_Message.Ack = ’10’;

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