1. How to Identify Interfaces inside a Projector Rick Landau, Dell, and the Projector & Display Management WG 2007/08/13

2. 2 Why Do We Need to Identify Interfaces? Which input is currently being displayed? – One of the most common help desk questions – Need to read from the projector which connector is active – Sometimes need to change the active connector remotely

3. 3 Need "CurrentInput" Properties For Video, many connector choices For Audio, too Properties (probably in General group) – VideoCurrentInputSource – AudioCurrentInputSource How do these properties point at a connector? They can specify – A connector number – A connector type

4. 4 CurrentInput by Connector Number Have an ordered list (table) of connectors, numbered for convenience Each connector identified as a type Enum list of connector types: –VGA –DVI –HDMI –Display port –Component video –Composite video –Ethernet –Phono input audio CurrentInput contains the number of the connector's row in the table

5. 5 CurrentInput by Connector Number (cont'd) – Advantages? A table allows us to add other properties for each interface, for instance an enabled/disabled bit Allows multiple connectors of the same type, e.g., VGA1 and VGA2

6. 6 Table of Interface Connectors IndexTypeEnabled 111 221 350 471 Enum list of connector types 1VGA 2DVI 3DisplayPort 4HDMI 5Component video 6Composite video 7RCA phono plug audio 8Ethernet 9WiFi VideoCurrentInputSource AudioCurrentInputSource 1 4

7. 7 CurrentInput by Connector Type Enum list of connector types – (same list) CurrentInput property contains the type of connector that is currently being used – Still a number in the enum list so it's unambiguous Drawback: does not easily allow for multiple inputs of the same type, e.g., VGA1 and VGA2.

8. 8 CurrentInput Property Containing Type Enum list of connector types 1VGA 2DVI 3DisplayPort 4HDMI 5Component video 6Composite video 7RCA phono plug audio 8Ethernet 9WiFi VideoCurrentInputSource AudioCurrentInputSource 1 7

9. 9 Questions?