DIO__GetDevicePDB (ul_pbar_dio)

 *  Synopsis:
 *    #include <ul_pbar_dio:dio.h>
 *
 *    int DIO__GetDevicePDB( const CDIOptr devicePtr, PDB_RS *devicePDB )
 *
 *  Function intent:
 *    DIO__GetDevicePDB() returns the DIO device reading/setting PDB data
 *    for the device pointed to by devicePtr.
 *  Function parameters:
 *    CDIOptr	devicePtr	The unique DIO device I/O control pointer
 *                              returned by DIO__InitializeModule().
 *    PDB_RS	*devicePDB	destination PDB_RS structure
 *  Function return value:
 *    DIO_OK		success
 *    CBS_INVARG	devicePtr was NULL or invalid
 *    DIO_BADARG	invalid property index passed
 *    DIO_MEMFAIL	memory allocation failure
 *    negative value	other ACNET format error
 *    positive value	number of devices in error