Extron Electronics VN-Matrix 250 User Guide - Manual (Page 88)

14. Enter the active horizontal resolution in the HSize field and the active vertical resolution
in the VSize field (see figure 68, 9 ).
15. Copy the values in the digFirstPixel and digFirstLine fields of the Device Status
panel to the FirstPixel and FirstLine fields (see figure 68, ¢ ).
16. Click the Update button (see figure 67 , 1 on the page 80). The User Source Format
settings are copied into the User.Source.Config file of the VN‑Matrix device designated
as the controller.
17. Press Save Source (see figure 68, £ ) to save the User.Source.Config file of the
VN‑Matrix device designated as the controller.
With the
mode drop‑down list still set to auto, the VN‑Matrix device should now select
the new user mode in the currentMode field.
18. Display a moiré pattern and check for clocking errors in the same user format area.
Clocking errors appear as vertical banding on the displayed image. If clocking errors
exist, select the User mode from the
Name drop‑down list and adjust the value in the
PixelsPerLine field. Each time you enter a new value in the field, you must click
Update , click the Save Source button, and reboot the VN‑Matrix controller and
encoder. Repeat this process until the clocking error is gone.
After you create a custom input mode, if the decoder does not find a suitable output mode,
you need to create a custom output mode (see
Custom Output Modes , on page 83).
NOTE: A stable video signal on the loop output of the encoder does not necessarily
indicate that the signal is being properly recognized. An encoder generates the
loop output signal by passing sync directly from the input connector to the output
connectors (a pass‑through), so it is not dependent on any previously stored modes
to create a loop output.
TIP: Before creating the custom mode, be aware that the encoder may report
inaccurate values for active horizontal pixels (digHSize) and active vertical lines
(digVSize).
The encoder analyzes the content displayed by the source PC to determine these
values. As a result, if your source is displaying a 100 pixel by 100 pixel white box
against a black background, the encoder may report a digHSize value of 100, and a
digVSize value of 100 as well.
Given this fact, it is a good practice to ensure that your PC is displaying a full image,
preferably full white or a moiré pattern, before creating a custom input mode.
VNM 250 • Configuration with the VNM 250 GUI 82