Extron Electronics VN-Matrix 250 User Guide User Manual
Page 92
5.
Calculate the horizontal back porch value. This value is calculated with the formula:
total
pixels
per
line
–
(active
pixels
in
width
+
horizontal
left
border
+
horizontal
right
border
+
horizontal
front
porch
+
horizontal
sync
width)
Using the values from the example in step 4, above, this equates to:
1800 – (1280 + 0 + 0 + 80 + 128) = 312
6.
Enter this value into the
Horizontal
Back
Porch
field (see figure 69,
3
).
7.
Calculate the correct vertical values for the mode. Assume that the
Vertical
Top
Border
,
Vertical
Bottom
Border
,
Vertical
Front
Porch
, and
Vertical
Sync
Width
are already correct.
8.
Enter the values for
Active
Lines
and
Total
Lines
(see figure 69,
4
) that were
returned in the Telnet session (see step 4, on the previous page).
9.
Calculate the vertical back porch value. This value is calculated with the formula:
total
lines
–
(active
pixels
in
height
+
vertical
top
border
+
vertical
bottom
border
+
vertical
front
porch
+
vertical
sync
width)
In the step 4 example, this equates to:
1000 – (960 + 0 + 0 + 3 + 4) = 33
10.
Enter this value in the
Vertical
Back
Porch
field (see figure 69,
5
).
11.
Calculate the pixel clock frequency. This is calculated with the formula:
total
lines
x
total
pixels
x
frame
rate
Using the values from step 4, this equates to:
1000 x 1800 x 60 = 108000000
12.
Enter this value in the
Pixel
Clock
Frequency
field (see figure 69,
6
).
13.
Click
Update
(see figure 69,
7
), and then click
Save Formats
(see figure 69,
8
). The
new mode should now be an exact match for the connected source.
14.
To test the new mode select the
Display
tab for the decoder, and ensure that
Auto
is
selected in the Output Format selector.
15.
Switch the resolution on the source to a different resolution and then switch it back
again. The mode should display. If it does not, see the
page 117.
VNM 250 • Configuration with the VNM 250 GUI
86