CHANGE_PERIODS	(	Integer	NSOFT,
		Integer	SEQUENCES,
		Integer	OUTPUT_DELAY,
		String	FILE,
		Integer	FRAMES,
		Integer	OUTPUT,
		String	LABEL,
		Qualifier	HARD_INT,
		Qualifier	HARD_EXT,
		Qualifier	SOFT,
		Qualifier	PFILE,
		Qualifier	PERIOD1,
		Qualifier	PERIOD2,
		Qualifier	PERIOD3,
		Qualifier	PERIOD4,
		Qualifier	PERIOD5,
		Qualifier	PERIOD6,
		Qualifier	PERIOD7,
		Qualifier	PERIOD8,
		Qualifier	ALLPERIODS,
		Qualifier	DAQ,
		Qualifier	DWELL,
		Qualifier	UNUSED
	)

Change period setup as part of a scripted block change operation.

Block change operations are enclosed by CHANGE_START and CHANGE_FINISH commands

Parameters:

`[in]`	HARD_INT	Hardware periods where a period change is initiated by the DAE after a specified number of frames
`[in]`	HARD_EXT	Hardware periods where period changes are initialted by an external source
`[in]`	SOFT	Software periods where period is changed by user via a CHANGE PERIOD= command
`[in]`	PERIOD1	Apply parameters such as DAQ, FRAMES etc. to first hardware period
`[in]`	ALLPERIODS	Apply parameters such as DAQ, FRAMES etc. to all periods
`[in]`	NSOFT	set the number of software periods (SOFT only)
`[in]`	SEQUENCES	set number of hardware period sequences to do (HARD_INT only)
`[in]`	OUTPUT_DELAY	define the position within a frame (ms) at which a HARD_INT period change takes place
`[in]`	DAQ	The period selected by PERIOD1 or ALLPERIODS will be a Data Acquisitoon period
`[in]`	DWELL	The period selected by PERIOD1 or ALLPERIODS will be a Dwell (non Data Acquisition) period
`[in]`	UNUSED	The period selected by PERIOD1 or ALLPERIODS will not be used
`[in]`	FRAMES	Specify the number of good frames to count in PERIOD1 or ALLPERIODS (HARD_INT only)
`[in]`	OUTPUT	Specify the output signal for PERIOD1 or ALLPERIODS (HARD_INT and HARD_EXT only)
`[in]`	LABEL	Specify the display label for PERIOD1 or ALLPERIODS (HARD_INT and HARD_EXT only)
`[in]`	PFILE	Use file specified by FILE to read period information from (HARD_INT and HARD_EXT only). Deafult: use PERIOD1 etc. specified values. a periods file just contains line of the form "DAQ 100 1 per1" for "DAQ period, 100 frames, output 1, label per1"

Precondition:: A previous CHANGE_START command been issued