Using the SCB-68 with Multifunction I/O Devices

You can take measurements with the SCB-68 and multifunction I/O (MIO) DAQ products, such as NI 60xx/61xx/62xx/63xx, in a number of ways. Switches S1 and S2 provide power to the signal conditioning area of the accessory. The SCB-68 has a temperature sensor for cold-junction compensation (CJC) to accommodate thermocouples; switches S3, S4, and S5 configure the temperature sensor for different analog input settings. The following table shows the different switch settings for MIO DAQ devices.

Table 2. MIO DAQ Device Switch Settings
Switch Setting Description
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MIO with disabled temperature sensor mode (default configuration) *—Move switches S1, S2, S3, S4, and S5 to the positions shown at left. In this mode:

  • The temperature sensor is not used.
  • AI 0 and AI 8 are available on screw terminals.
  • +5 V power provided to signal conditioning area of the accessory.

Refer to the following figure for a detailed diagram.

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MIO with single-ended temperature sensor mode *,†—Move switches S1, S2, S3, S4, and S5 to the positions shown at left. In this mode:

  • The temperature sensor can be read using AI 0 in referenced single-ended (RSE) mode.
  • AI 8 is available on a screw terminal.
  • +5 V power provided to signal conditioning area of the accessory.

Refer to the following figure for a detailed diagram.


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MIO with differential temperature sensor mode—Move switches S1, S2, S3, S4, and S5 to the positions shown at left. In this mode:

  • The temperature sensor can be read using AI 0 and AI 8 in differential mode.
  • +5 V power provided to signal conditioning area of the accessory.

Refer to the following figure for a detailed diagram.


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Direct feedthrough mode—Move switches S1, S2, S3, S4, and S5 to the positions shown at left. In this mode:

  • All 68 signals from the device connect directly to screw terminals.

Refer to Using the SCB-68 in Direct Feedthrough Mode for a detailed diagram.

* Not available on Connectors 1, 2, 3 of NI 6225/6255 or NI 6345/6355/6365/6375 devices.

† Not available on NI 61xx devices.
Figure 4. MIO Device Modes Switch Settings

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