DX-2200
– Dual-view 2x1 SDI Video Switcher
Page 17 of 87
The actual delay will depend on the timing of the connection of the input signals
and the phase relationship between the inputs if they are not locked to each other.
Depending on operation conditions, the video delay may remain constant, or may
vary over time. The DX-2200 does not require the two video inputs to be
synchronized, and the output video can either be locked in frequency to input 1, or
use an internally video clock. When different video clocks are used, small
differences between the clocks will cause the video delay to change. If the output
clock is slower than the input clock, video will accumulate in the frame buffers until
a frame is dropped to prevent buffer overflow. When the output clock is faster than
the input clock, the length of video in the buffers will decrease until a frame must
be repeated to prevent buffer underflow. If all video clocks are derived from the
same source and are identical in frequency, the delay through the DX-2200 will
remain constant.
SERIAL & MANUAL Control
The DX-2200 Switcher has two methods of control: SERIAL Control using the
RS232 port, and MANUAL Control using the DIP switch and Toggle switch.
SERIAL Control allows control full of the capabilities of the DX-2200, and
MANUAL Control provides a subset of functions.
SERIAL Control is always active. In the factory default configuration the Toggle
Switch and DIP switch are active.
The functions of the DIP switch and Toggle switch can be reconfigured by SERIAL
Control commands to customize the Switcher so that the controls provide the set
of functions required for a specific user application. The modified configuration can
be saved on board in the flash configuration memory
SERIAL Mode of Operation
When SERIAL control is used, the DX-2200 Switcher is controlled via commands
sent to the DB9 Serial Control Port.
The serial port of the computer connected to the DX-2200 should be configured for
115,200 baud, 1 stop bit, and no flow control.
Microtronix sells an optional USB to DB9 RS-232 Serial Port Adapter Kit,
(PN: 811-USB-RS232-Kit) which can be used to connect the USB port of a PC or
laptop to the Serial Port of the DX-2200. (See Appendix C.)
S
ERIAL
P
ORT
C
ONTROL
C
OMMANDS
In the SERIAL mode commands sent to the Serial Control Port control the
operation of the DX-2200. Commands consist of ASCII alpha-numeric codes and
are not case sensitive. All serial commands are terminated with a carriage return
(CR), a line feed (LF), or a semicolon. The use of a semicolon terminator allows
more than 1 command per line to improve readability of script files.
Commands may be sent directly to the DX-2200 one character at a time using a
terminal program running on a connected computer, or they may be developed in
a text editor such as Notepad and then uploaded to the DX-2200 by the terminal
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