Matrox MXO2 PCIe Host Adapter - Manual (Page 116)

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Chapter 8, Using Matrox MXO2 with Adobe Premiere Pro
3 Click Options to display the following dialog box:
4 From the Port list, select Matrox RS-422 if you’ve connected your device
to the RS-422 connector on your MXO2 hardware (not available on MXO2
Mini). For MXO2 Mini, select the COM port on your computer to which
you’ve connected your device.
5 From the Time Source list, select the time source to be used for controlling
your device:
$
LTC Longitudinal Time Code recorded on a track adjacent to the video
(this is the default time source). This type of time code can be read at all
tape speeds, except still.
$
VITC Vertical Interval Time Code that is recorded onto the vertical
blanking interval of the video. This type of time code can be read
whenever an image is displayed, but not usually during high-speed
operation.
$
LTC+VITC Select this if you want your device to decide which type of
time code to use in different operational modes (recommended only if
you’re sure that the two types of time code match on your tape).
$
Control Track Select this if you want to use only your tape’s control
track as the time source. Because using the control track is not as reliable