Quantum Data 802BT, User Manual

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416 Appendix A Command Reference
LSPP
Line Sync Pulse Polarity
Class Format parameter setting - Synchronization
Description Establishes the logic sense of the digital line sync output. Setting polarity to 1 causes the
leading edge of line sync to be a low-to-high transition. Setting polarity to 0 causes the
leading edge of line sync to be a high-to-low transition. The LSPP? query returns the
current polarity of LSPP.
Command syntax LSPP polarity
polarity
0 = active-low (negative going pulse)
1 = active-high (positive going pulse)
Query syntax FSPP?
Query response 0 or 1
Other required
commands
In order to get a pulse, line sync must first be enabled with the LSPG 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
LSPG 1 // Enable Line Sync
LSPP 1 // Set for positive going pulse
LSPW 20 // Make the pulse 20 pixels wide
LSPG 300 // Pulse to occur 300 lines after
// the last line of active video
FMTU // Update hardware to new settings