Quantum Data 881, User Manual

Page: 756 / 1144

378 Appendix A Command Reference
HSPP
Horizontal Sync Pulse Polarity
Class Format parameter setting - Synchronization
Description Establishes the logic sense of the digital horizontal sync outputs. Setting polarity to 1
causes the leading edge of horizontal sync to be a low-to-high transition. Setting polarity to
0 causes the leading edge of horizontal sync to be a high-to-low transition. The HSPP?
query returns the current polarity of HSPP.
Command syntax HSPP polarity
polarity
0 = active-low (negative going pulse)
1 = active-high (positive going pulse)
Query syntax HSPP?
Query response 0 or 1
Other required
commands
To use digital horizontal sync, it must be gated on with the HSPG command and digital
separate H and V sync must be selected with the SSST command. The FMTU command
instructs the generator to use the new settings. The ALLU command updates the
hardware to the new settings and redraws the test image.
Example
HSPP 0 // Set active low H sync in buffer
HSPG 1 // Enable H sync output in buffer
SSST 1 // Select H&V sync type in buffer
FMTU // Update hardware to current buffer contents