National Instruments IMAQ PCI-1409 User Manual

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Chapter 2 Configuration and InstallationIMAQ PCI/PXI-1409 User Manual 2-6 ni.comVIDEO0 Input ModeVIDEO0 has two different input sources via a BNC connector or a 68-pinVHDCI port and two different input modes—referenced single-ended(RSE) and differential (DIFF) input. When you use the BNC input forVIDEO0, set the input mode to RSE (W1 populated). When you usethe 68-pin VHDCI port for VIDEO0, set the input mode for either RSEor DIFF.When in RSE mode, the video input uses one analog input line, whichconnects to the video multiplexer circuitry. The negative input to the videomultiplexer is tied internally to analog ground. When in DIFF mode, thevideo input uses two analog input signals. One signal connects to thepositive input of the video multiplexer circuitry while the other inputsignal connects to the negative input of the video multiplexer circuitry.Jumper W1 controls the input mode selection, as shown in Figure 2-3.Unpopulating W1 configures VIDEO0 for DIFF mode. Populating W1configures VIDEO0 for RSE mode.Figure 2-3. Configuring VIDEO0 with Jumper W1Video channels 1, 2, and 3 are always in differential mode. To take an RSEmeasurement on these channels, tie the negative terminal of the connectorto ground (Pins 26 or 60 on the 68-pin VHDCI connector). See Chapter 4,Signal Connections, for more information on pin assignments.a. RSE Mode (Default) b. DIFF Mode