MICROTRONIX DX-2200 User Manual Download

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DX-2200

– SD/HD-SDI Text & Graphics Inserter – User Manual

Page 22 of 103

Table 7: Baud Rate SERIAL Command Codes

Command Code

Mode of Operation

MBnnnnnnn

Set the baud rate to nnnnnnnn where nnnnnnnn is a number
between 9600 and 1000000 baud.

4.8.1.7 Picture-in-Picture Position, Size, and Zoom SERIAL Commands

These commands apply only to the Text Inserter with PiP mode of operation (Mode 2, see the Mode Control
Serial Commands).

The position and size of the Picture-in-Picture (PiP) display is selected through character commands sent
via the RS-232 port per Table 6 below.

There are two different methods of controlling the PiP size and position. The first method selects one of four
predefined positions and one of 16 predefined sizes using the commands PSnn, PAxxxx, PByyyy, followed
by P3, P4, P5, P6, P7, or P8 to set the positions and apply the settings.

For example: PiP in the bottom right corner using control method 1:

PS04

' Set PiP size to be 4/16ths of the video width

PA20

' Offset PiP 20 pixels horizontally from edge of the video

PB20

' Offset PiP 20 pixels vertically from the edge of the video

' Apply settings and place PiP in bottom right corner

If the PS, PA, or PB commands are omitted in the above example, the previous setting, or the default will
apply. The default size for the PiP window is 6/16

of the video width (equivalent to the command PS06).

The default horizontal and vertical offset is 1 pixel + 1% of the screen width. If the P2 command is omitted
there will be no visible change to the PiP because it is this command that applies the parameters set the
other commands in the example.

The second method of setting PiP size and position does not use predefined sizes or positions, instead the
width, height, and the x and y position of the top left corner are set in terms of number of pixels by using the
commands PWxxxx, PHyyyy, PXxxxx, PYyyyy, followed by either PU or PR to apply the settings.

For example: PiP configured using method 2:

PX100

' Set Top Left corner of PiP to x=100 pixels from the left

PY400

' Set Top Left corner of PiP to y=400 pixels from the top

PW711

' PiP window width = 711 pixels

PH400

' PiP window height = 400 pixels

' Apply the PiP Settings

This control method allows the aspect ratio of the PiP window to be changed, possibly resulting in stretched
or compressed video in the PiP window. If the PR command is used instead of the PU command, the height
parameter set for the PiP window by the PH command is ignored, and a value is calculated from the width to
provide a 16:9 aspect ratio for the PiP window.

In all cases, the PiP window must fit within the video. It is not possible to place the PiP window partly or fully
off screen. The DX-2200 will automatically adjust the gap, position and size parameters as needed to force
the PiP window to fit on screen. The minimum PiP width and height is 32 pixels. The DX-2200 will
automatically adjust the size to prevent the PiP windows being smaller than this size.

The PiP supports a limited zoom / cropping function that allows a selected region of the PiP video source to
be overlaid on the main channel instead of the entire frame. Two modes for selecting a region of the frame
are provided. The first method is controlled by a zoom factor specified in percent and a center location for
the zoom. The second method selects the top and left edge of the region, and the width and height. These