Extron electronics VN-Matrix 250 Series, User Manual

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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
, on the
previous page).
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
( 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 (
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 (
6
).
13. Click
Update
(
7
).
14. Click
Save Formats
( 8 ). The new mode should now be an exact match for the
connected source.
15. To test the new mode select the
Display
tab for the decoder, and ensure that
Auto
is
selected in the Output Format selector.
16. 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
Troubleshooting Guide on
page 118.
VNM 250 • Configuration with the VNM 250 GUI 87