dio_get_extended_pdb_c

	status.i4.v = dio_get_extended_pdb_c(device_indices.i4a.r,
					     properties.i2a.r, pdbs.sa.r,
					     errors.i2a.r [,num_devices.i4.v])

	This routine returns extended PDBs for specified devices
	and properties.
	
	device_indices	device index or array of device indices
	properties	property index or array of property indices
			(PRREAD -> reading property,
			 PRSET -> setting property)
			(If the first value is less than zero, all devices
			 use a property index which is equal to the absolute
			 value of this argument.)
	pdbs		array of "num_devices" PDB structures returned in
			the caller's data space
			(structures of type PDB_RS_EXT)
			(If a value of NULL is passed for this argument, no
			 PDBs will be returned to the caller, but they will
			 be cached in the program's memory for later use.)
	errors		returned ACNET status value or array of returned
			status values (A status of DBM_NOREC indicates that
			the requested PDB does not exist even though the
			requested property does exist.  If the property
			itself doesn't exist, a status of DBM_NOPROP is
			returned.)
	[num_devices]	number of devices in the list (default is 1)

	This function returns status values as follows:

	OK			success
	DIO_BADARG		invalid property index or combination of
				property indices was passed
	DIO_MEMFAIL		memory allocation failure
	negative value		other ACNET format error
	positive value		number of devices in error

	This function requires the following include files:

	dbprops_h, cns_data_structs_h, diolib_h, acnet_errors_h

	Related functions:

	dio_manage_extended_pdbs_c, dio_get_pdb, dio_delete_pdb,
	dio_insert_pdb_lst, dio_delete_pdb_lst, dio_pdb_to_scaling_info_c,
	dio_pdb_sts, dio_pdb_ctl, dio_scaling, dio_get_historic_scaling_c,
	dio_data_type_info_c, error_in_list(_c)

	C/C++ usage:

	short	errors[NUM_DEVICES];
	short	properties = -PRSET;
	int	status;
	static const int	device_indices[NUM_DEVICES] = {14430, 14431};
	int	num_devices = NUM_DEVICES;
	PDB_RS_EXT	pdbs[NUM_DEVICES];

	status = dio_get_extended_pdb_c(device_indices,&properties,
					pdbs,errors,num_devices);