dio_set_for_read(_c)

	status.i4.v = dio_set_for_read(on_off.i4.r)

	status.i4.v = dio_set_for_read_c(on_off.i4.v)

	This function will set or clear the "set for read" privilege bit for
	the calling task.  This function is provided for those segments of
	applications that do GSSET or DPSET calls to obtain readings.  New
	consoles may be locked from setting access (i.e. readonly).  Those
	programs that wish their reading functions that require a setting
	setup to work may wish to encapsulate those sections of code with a 
	dio_set_for_read with an "on" followed by an "off".

	on_off		setting command
			(DIO_SETTINGS_OFF -> disable settings,
			 DIO_SETTINGS_ON -> enable settings)

	This function returns status values as follows:

	OK			success
	otherwise		request failed

	This function requires the following include files:

	diolib_h, acnet_errors_h

	Related functions:

	set4rd, dio_set_raw(_c), dio_set_dev(_c)

	C/C++ usage:

	int	status;
	int	on_off = DIO_SETTINGS_ON;

	status = dio_set_for_read_c(on_off);