Camera system
messtechnik
EMC Test and Measuring Systems
mk
Extended Manual
informations about the connected monitor. This way the video source recognizes whether it is connected to an
analog (VGA) or digital (HDMI/DVI) interface and which resolutions and frame rates can be displayed.
This data is
stored in an EPROM and is read over an I2C interface. HDMI, DVI and VGA cables provide a I2C line for this
purpose.
The AV input card has one EPROM each for VGA EDID and HDMI/DVI EDID. Since the input board has no separate
connector for VGA (VGA can only be connected using a VGA→DVI adapter), it has to be switched between the two
EPROMs (see figure 2-5). If VGA (DVI) is selected, data will be read from the VGA (DVI) EPROM.
Figure 2-5: Reading EDID from the EPROM of a AV input card
The data will be read only once after connecting a VGA (DVI) source. The following has to be considered:
If a DVI source is plugged in and the AV input card is set to VGA, the DVI source will read the EDID for VGA.
This
way it recognizes an „analog monitor“ and therefore does not send DVI video signals. If the AV input card is
switched to DVI, the DVI source still won't send a signal, because it does not re-read the EDID.
This can be resolved
by unplugging the connector. After plugging the connector back in again, the EDID for DVI will be read. If you use a
PC as video source, you can also trigger the re-read of the EDID manually. See the manual of your operating
system on how to detect monitors. You should see a monitor called MK VIDEO DVI.
2.2.3 Relay Card
The relay card is used to optically output AV signals to feed them into an optical input of another receiver (see
chapter 2.2.1).
This is only available for receivers of type matrix.
op
tic
a
l
I/O
n+
2
0
op
tic
a
l
I/O
Figure 2-6: Connectors of the relay card (option with two outputs)
Depending on the selected option the relay card can contain one (for the 4HU and 8HU matrix) or two (only for
the 4HE matrix) connectors.
The first optical output is always identified via the physical slot (channel) on the receiver. The second optical
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