status.i4.v = dio_digital_control_c(device_index.i4.v,
					    string.i1a.r, length.i4.v)

	This routine sends a digital control command to a device.

	device_index	device index
	num_elements	number of array elements to control
	start_element	first element to control (starts at 0)
	string		digital control string
	length		length of string (If a value of zero is passed,
			the length of the string will be calculated.)

	This function returns ACNET status values as follows:

	OK			success
	DIO_MEMFAIL		memory allocation failure
	DIO_BADARG		invalid digital control string
	DIO_SETDIS		DIO settings are disabled
	DPM_xxx			datapool access error

	This function requires the following include files:

	diolib_h, acnet_errors_h

	Related functions:

	dio_digital_control_list_c, dio_digital_control_text_to_value_c,
	dio_digital_control_text_to_value_list_c, dio_digital_control_info_c,
	dio_raw_to_control_text_c, dio_digital_control_menu_c,

	C/C++ usage:

	static const char	string[] = "Reset";
	int	status;
	int	num_elements = 1;
	int	start_element = 0;
	int	device_index = 140013;
	int	length = 0;

	status = dio_digital_control_c(device_index,num_elements,start_element,