Quantum Data 801GC, 801GF, 801GX manual Vspp, Vertical Sync Pulse Polarity, Vspw, 174

VSPP Vertical Sync Pulse Polarity

Classification: Format parameter setting

Command Syntax: VSPP <polarity>

Limits: <polarity>

0= active-low (negative going pulse)

1= active-high (positive going pulse)

Query Syntax:	VSPP?
Query Response:	<mode>
Description:	The VSPP command establishes the logic sense of the digital
	vertical sync outputs. Setting polarity to one (1) causes the leading
	edge of vertical sync to be a low-to-high transition. Setting
	polarity to zero (0) causes the leading edge of vertical sync to
	be a high-to-low transition. The VSPP? query returns the current
	polarity of VSPP.
Other Required Cmds:	In order to use digital vertical sync, it must be gated on with
	the VSPG command and digital separate H&V sync must be
	selected with the SSST command. The FMTU command instructs
	the generator to use the new setting. The ALLU command updates
	hardware to the new setting and redraws the test image.
Example:	V S P P 1 / / S e t a c t i v e h i V s y n c i n
	/ / b u f f e r
	V S P G 1 / / E n a b l e V s y n c o u t p u t i n
	/ / b u f f e r
	S S S T 1 / / S e l e c t H & V s y n c t y p e i n
	/ / b u f f e r
	F M T U / / U p d a t e h a r d w a r e t o c u r r e n t
	/ / b u f f e r c o n t e n t s

VSPW	Vertical Sync Pulse Width
Classification:	Format parameter setting
Command Syntax:	VSPW <lines>
Limits:	<lines>
Query Syntax:	VSPW?
Query Response:	<lines>
Description:	The VSPW command establishes the width of the vertical sync
	pulse in lines. If the type specified for the selected sync signal
	(see SSST, ASCT, DSCT, or DSST commands) is one of the CCIR
	types, then the actual sync pulse width output by the generator
	will be 1/2 line shorter than the whole number specified. The
	VSPW? query returns the current setting of VSPW.

Other Required Cmds: The FMTU command instructs the generator to use the new setting. The ALLU command updates hardware to the new setting and redraws the test image.

Example: V S P W	3	/ /	S e t V s y n c w i d t h t o 3 l i n e s
	/ /	i n	b u f f e r
F M T U	/ / U p d a t e h a r d w a r e t o c u r r e n t
	/ / b u f f e r c o n t e n t s

6-174 Chapter 6: Programming Model 801GC, 801GF & 801GX¥Rev. A