The EMX-DVI automatically compensates for the signal degradation caused by long
video cable runs of up to 50 ft (15 m) on its input and can drive long DVI Cables on
its output to 40 ft (12 m) by boosting and echo-canceling the DVI video output. Its
ability to equalize cable losses makes it ideal to be placed at the far (display) end of
long DVI cables.
By default, the unit is setup to buffer single link DVI (or HDMI) signals. Use the recessed LINK pushbutton to change the mode to support Dual link TMDS signals.
There is an indicator on the top of the unit for the selected mode.
In most instances, when configured for Single Link extension, the unit can operate from the power available through the DVI source signal and no external power supply connection is required.
The unit ships with a universal power supply in case the power from the DVI input source is insufficient. The power supply is plugged in at the USB connector. When the USB port is connected to a PC (cable supplied), the unit is powered by the PC through the USB connection.
The DDC channel (that handles EDID and HDCP data) can either be bypassed through the EMX-DVI (so the source communicates directly with the connected display), or it can be emulated whereby the EDID is supplied from internal memory.
The product is shipped with a fixed internal EDID table for emulate mode, but this table can be overwritten by either learning the EDID from a connected sink (display), or uploaded via the USB port using the free software from Hall Research. The user
can revert to the original internal table if required, by performing factory reset using the software.
Advantages of having a mode that emulates the EDID are:
- Video problems may be caused by errors in the EDID data transmission from the display to the PC (long cables, or extension and switching
equipment), supplying EDID from the EMX-DVI can resolve those problems. - You can control the EDID table that is being emulated. For example you can “learn” a certain LCD’s EDID, or even upload your own edited EDID.
- In Emulate mode the PC detects a connected display even if there is no physical display connected, or if the display is off and not asserting its Hot Plug Detect signal. In emulate mode the HPD is asserted and the PC is allowed to fully boot in critical applications regardless of what is connected at its DVI (or VGA) output.
- Some sources such as MacBook™ laptops by default output video with HDCP (when they detect connection to a sink that supports HDCP), but when connected through the EMX-DVI in emulate mode, MacBooks™ will output video without HDCP (if the source video has DRM, such as a DVD movie, then no video will be shown). This can be an advantage in cases where you are connecting a MacBook™ through some splitters or switches that support HDCP to a video conferencing system that cannot support HDCP. All that is needed is the EMX-DVI in emulate mode connected at the video output of the Mac.
The EMX-DVI provides a driver free USB port for connection to a PC. The package includes a universal power supply, a USB cable for connection to a PC, and a CD containing the User’s Manual and Windows™ PC. This software allows reading, saving, manipulating, and writing EDID tables to and from the device. The EMX-DVI modes (Bypass vs. Emulate or Single-Link vs. Dual-Link) are also controllable via the USB port.
The DVI connectors used on the unit are DVI-I (they have all the pin sockets even for analog RGB). The device provides DVI-I bypass for analog RGBHV (or VGA) signals (i.e. analog pins on the DVI-I input are connected to the output), so it can manage EDID for VGA sources and displays using inexpensive VGA to DVI cables or adapters.
Using free Hall Research Windows™ software, you will be able to read and save EDID data from any display. Edit the EDIDs using 3rd party free software available in the Additional Download
