Quantum Data 802BT - Manual (Page 210)

200 Chapter 12 Using Special Sync Output
PSHD 100 // set pulse horizontal position at 100 pixels from leading
edge of horiztonal sync pulse, in range from 0 <= PSHD <( HTOT - PSPW - 1)
PSVD 50 // set the pulse vertical position at 50 lines from leadinig
edge of vertical blanking, in range from 0<=PSVD<(VTOT-1)
ALLU // apply the settings
To set the lines on which the probe pulse occurs:
1. Send the appropriate command:
2. Send the ALLU command to apply the setting.
Set the probe pulse to occur Command
Once per frame PSPM 0
Once every active line PSPM 1
Once every line PSPM 3