User Manual Part 2

IS-900 User Guide Page 143 of 159
Verifying Synchronization
To verify GENLOCK is working with the IS-900, check the GENLOCK indicator in the
lower-right corner of the LCD on the front panel of the processor. When GENLOCK is
on and stable, the indicator displays “G”, otherwise the indicator displays an “X”
indicating GENLOCK is enabled but the processor is not synchronized. If “G” or “X” is
not displayed, then GENLOCK is off.
Using CrystalEyes™
To configure an IS-900 for use with CrystalEyes™, set the sync signal type to TTL and
send the command MG2,120 or MG2,60 to the tracker (assuming the video refresh rate
is 60 Hz or 120 Hz per eye). Connect the external sync signal used for the
CrystalEyes™ IR emitter to the SYNC IN on the back panel of the IS-900 Processor.
Adjusting Phase Point
A data record is output once per sync period when the tracker is in continuous mode.
The phase point is the time within the sync period at which a data record is transmitted
and is adjustable for internal and external GENLOCK. The phase point is specified as a
percentage of the sync period. 0% (the default) instructs the tracker to output a data
record as soon as possible after the sync period begins. 100% delays the output of a
record as much as possible before the next sync period begins. To adjust phase point
via command:
MGP[+/-]<> Increase/decrease to next/preceding phase point
MGP[p]<> Set phase point to percentage specified by p (0 to 100)
The current phase point is reported if the command is issued without parameters (or
invalid ones). The tracker will accept the first form of the command only after GENLOCK
is established. With the second form of the command, the tracker will match the
specified phase point as best it can, but typically with far less resolution than 1/100
th
of
the sync period.
To set the phase point via the LCD menu, select System Config→Genlock→Phase→Set
and change the value with the arrow buttons, then press the enter button. To increase
or decrease to the next or previous phase point, select System
Config→Genlock→Phase→Increase or →Decrease.
Adjust the phase to the latest point in the cycle (for minimum latency) such that the
system still behaves smoothly during head rotation (no render cycles last beyond the
deadline for the next scan out).