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In 3D mode the SYNC/3D MODE LED state depends on the presence of a valid 3D synchronization signal coming from the projector. If a valid
3D sync is detected, the LED is ON. If the signal is not present or is invalid, the LED is OFF.
Note: When “frame sync” mode control source is selected, absence of a valid 3D synchronization signal automatically sets the mode to 2D.
See the
Mode Control Sources
section of this manual for more information.
While in 3D mode, the unit continuously scans for conditions to transition to 2D mode. The conditions depend on which mode detection
method is selected - refer to section
Mode Control Sources
.
Mode Control Sources
The modulator has three ways of determining whether it should operate in 2D or 3D mode:
(A) Detecting a valid 3D synchronization signal coming from the projector -> “Frame Sync mode control source”
(B) Listening for a 3D or 2D command macro on the LAN -> “Network mode control source”
(C) Triggering on a dedicated GPIO line of the GPIO connector -> “GPIO mode control source”
Which one of the three mode control sources is active can be set using the modulator’s PC-based configuration utility (see the
Modulator
Configuration Using the PC Based Configuration Utility
section) or by sending a dedicated string macro command over the network
from a projector or digital cinema server (see the “modctrls” command in section
Network Mode Control Source
). By default the “Frame
Sync” mode control source is selected.
Frame Sync Mode Control Source
The default way of determining whether the modulator must begin operating in 3D mode is to monitor the 3D synchronization signal line
coming from the projector for the presence of a valid synchronization signal. This signal comes into the modulator through its GPIO connec-
tor. If a valid signal is detected, the modulator transitions to 3D mode and stays there for as long as the signal is present.
The 3D synchronization signal is a square wave. Whether a signal is valid or not is determined by measuring its frequency. By default all
signals with a frequency between 35 Hz and 150 Hz are considered valid. However, these limits can be modified through the modulator’s
PC-based configuration utility. For more information see section
Using the Configuration Utility
.
GPIO Mode Control Source
If the modulator is set for GPIO Mode control source, the modulator then supports control over one GPIO line which is typically connected to
one of the projector’s or digital cinema server’s GPIO lines.
By default an externally applied open loop / open circuit between pins 3 and 8 sets 2D mode. Close circuit on those same pins sets 3D
mode. Polarity can be inverted by using the PC-based configuration utility or by sending a dedicated command macro from the projector
or the digital cinema server.
An optically isolated open-collector or open drain GPIO control line needs to be connected between pins 8 and 3 to avoid
damage to the modulator and/or projector - see the schematic below. Projectors and servers are typically equipped with
such outputs so only a suitable passive cable is required.
Alternatively CMOS levels with a 3.3 V supply can be used with pin 8 connected
to GND. However optically isolated lines are preferred.
1
Projector or Digital Cinema Server GPIO
D-SUB 9 Male
XPAND Passive 3D Polarization Modulator
4
2
3
GND
GND
GND
10k
1k
GND
GND
+3V3
+3V3
1
2
3
4
5
6
7
8
9
0
Summary of Contents for Passive 3D PolarizationModulator Gen2
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