|External Interfaces Reference|
Determine if serial port objects are valid
||A serial port object or array of serial port objects.
||A logical array.
out = isvalid(obj)
returns the logical array
out, which contains a
0 where the elements of
obj are invalid serial port objects and a
1 where the elements of
obj are valid serial port objects.
obj becomes invalid after it is removed from memory with the
delete function. Because you cannot connect an invalid serial port object to the device, you should remove it from the workspace with the
Suppose you create the following two serial port objects.
s2 becomes invalid after it is deleted.
isvalid verifies that
s1 is valid and
s2 is invalid.
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