Appendix A: Control Protocol
IMAGESTAR HD USER GUIDE
Page 86
I460GB issue 4
SetOscan
Function
Sets the overscan or underscan factor required by the display devices.
Format
SetOscan=
<
horizontal overscan
>
,
<
vertical overscan
>
,0,0,0,0\r
Arguments
<
horizontal overscan
> and <
vertical overscan
> are specified as either a positive
number representing the amount of overscan or a negative number representing
the amount of underscan.
Typically the required overscan/underscan will be quoted as a percentage,
e.g
. 8.5%. To obtain the value for this argument, multiply the percentage value
by 1024 then divide by 100.
Using the example of 8.5% will give 8.5×1024÷100 = 87.04.
Round the answer up or down to the nearest whole number,
i.e.
87.
Example
SetOscan=87,87,0,0,0,0\r
Configures the outputs for 8.5% overscan horizontally and vertically. Values
derived from 8.5×1024÷100 = 87.04 (rounded to 87).
SetOscan=–90, –120,0,0,0,0\r
Configures the outputs for –8.8% underscan horizontally and –11.7% underscan
vertically. Values derived from –8.8×1024÷100 = –90.112 (rounded to –90) and
–11.7×1024÷100 = –119.808 (rounded to –120)
