DIO__GetDI (ul_pbar_dio)

 *  Synopsis:
 *    #include <ul_pbar_dio:dio.h>
 *
 *    long int DIO__GetDI( const char *deviceName )
 *
 *  Function intent:
 *    DIO__GetDI() returns the ACNET DI for the given ACNET device name.
 *  Function parameters:
 *    const char *deviceName	pointer to device name string
 *  Function return value:
 *    0L			could not get device index
 *    otherwise			device index for deviceName