DVI Extended input
The control panel has a DVI Extended input (X101). It is used to transmit the graphics signal from the industrial PC to the control panel.
The graphics signal is transferred directly via a DVI cable over a distance of 50 m max. Such a cable length leads to strong distortion of the graphics signal on arrival at the control panel. A signal processor is used in the control panel to fully restore the DVI signal. The industrial PC requires a conventional DVI output.
Pin | Connection | Pin | Connection | Pin | Connection |
|---|---|---|---|---|---|
1 | TMDS Data 2 - | 9 | TMDS Data 1 - | 17 | TMDS Data 0 - |
2 | TMDS Data 2 + | 10 | TMDS Data 1 + | 18 | TMDS Data 0 + |
3 | TMDS Data 2/4 Shield | 11 | TMDS Data 1/3 Shield | 19 | TMDS Data 0/5 Shield |
4 | TMDS Data 4 - | 12 | TMDS Data 3 - | 20 | TMDS Data 5 - |
5 | TMDS Data 4 + | 13 | TMDS Data 3 + | 21 | TMDS Data 5 + |
6 | DDC Clock | 14 | + 5 V Power | 22 | TMDS Clock Shield |
7 | DDC Data | 15 | Ground (+ 5 V, Analog H/V Sync) | 23 | TMDS Clock + |
8 | Analog Vertical Sync | 16 | Hot Plug Detect | 24 | TMDA Clock - |
Setting the data transfer rate
If the distance between the PC and the control panel is large, the data transfer rate for the DDC file must be limited. The DDC file is transferred from the control panel to the PC to tell the PC the properties of the display such as timing and resolution.
The VideoBIOS in the graphics card, or in case of on-board graphics the VideoBIOS in the motherboard, contains the definition of the data transfer rate for the DDC file. This value must be 50 kHz or less. If this value is too high, the image is either not displayed or only displayed after Windows starts.
Windows graphic drivers also contain a value for the data transfer rate of the DDC file. If no image is displayed under Windows, a graphic driver must be used that contains a value of 50 kHz or less for the DDC file transfer.