MICROTRONIX DX-2200, User Manual

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DX-2200
– SD/HD-SDI Text & Graphics Inserter – User Manual
Page 52 of 103
Table 13: Graphic Layer 1 Low Level Overlay Commands
Command Code Mode of Operation
Graphic Layer 1 Low Level Overlay Commands
SB
Renders the graphic fields of the active layer to the spare buffer, but the buffers are
not swapped. The video output does not change.
SW
Swap the active and spare buffers on the active graphics layer, and then clear the new
spare buffer. No fields are rendered and the spare buffer is displayed with its existing
content.
SS
Swap the active and spare buffers on the active graphics layer without rendering and
fields or clearing of any buffers
SC For the active graphics layer, clear the spare buffer
SnU
SnnU
For the active graphics layer, render only the field number specified to the spare
buffer.
4.8.1.11 Frame Counter Overlay SERIAL Commands
The DX-2200-TI has a Frame Counter that displays the frame number on Graphic Layer 1 of the output
video. The count of the Frame Counter is based on the number of video frames output from the unit.
4.8.1.11.1 F
RAME
C
OUNTER
D
ISPLAY
M
ODE
The main function of the Frame Counter is to display an automatically incrementing count on the video. The
frame counter can display a count that increments on each video frame, formatted as either an integer, or as
HH:MM:SS:FF where FF is the frame number. It can also display the time from a clock that is independent of
the video, formatted as HH:MM:SS with 0 to 3 decimal places for seconds. The DX-2200 does not have a
battery backed up real time clock; therefore the time and frame counts are lost when the unit is powered
down or reset. If the frame count needs to be set to real time, or some other specific starting value, then an
external controller must send a Serial Command to the DX-2200 after power up to set the count. The time
can also be obtained from a GPS receiver attached to the DB9 serial port.
The Frame Counter has 9 modes of operation that are selectable using the SFMn command (See Table 14).
4.8.1.11.1.1 Frame Counter Mode 0
Frame Counter Mode 0 turns off the frame count display. When the automatic counter is off, it is possible to
send ASCII text and display it on the video by Serial Command. This mode supports writing short custom
strings at a high frame rate. If the external controller can send commands synchronized with video frames, it
is possible to draw at frame rate.
4.8.1.11.1.2 Frame Counter More 1
Frame Counter Mode 1 is a counter formatted as ‘HH:MM:SS:FF’, where FF is the frame number. For frame
rates of 29.97 and 59.94 Hz, the frame counter implements drop frame timecode by default so that the frame
counter displayed as time (Mode 1) tracks with real time. It is possible to disable drop frame timecode using
the SCF0 command. For all other video frame rates, the counter counts from 00 to the number of frames per
second minus one.