Table Of Contents

Internal Channels for X Series Multiplexed Sampling Devices

Last Modified: November 16, 2017

On an X Series device, you can either acquire a signal present on the I/O connector, or you can acquire a signal that is being generated from the internal calibration multiplexer. The channels available on this multiplexer are typically used for calibration purposes, but you can also sample them as you would a physical signal present on the I/O connector. To read from one of these internal channels on a X Series multiplexed sampling device, you must use the internal channel as the device's physical channel (for example, Dev1/_aignd_vs_aignd) when creating the virtual channel.

The following table describes all internal channels for X Series multiplexed sampling devices.

Internal Channel Name Description
_aignd_vs_aignd A single-ended terminal with the positive and negative terminals both connected to the ground reference for analog input.
_ao0_vs_aognd A differential terminal with the positive terminal connected to physical channel ao0 and the negative terminal connected to the ground reference for analog output.
_ao1_vs_aognd A differential terminal with the positive terminal connected to physical channel ao1 and the negative terminal connected to the ground reference for analog output.
_ao2_vs_aognd A differential terminal with the positive terminal connected to physical channel ao2 and the negative terminal connected to the ground reference for analog output.
_ao3_vs_aognd A differential terminal with the positive terminal connected to physical channel ao3 and the negative terminal connected to the ground reference for analog output.
_calref_vs_aignd A single-ended terminal with the positive terminal connected to the internal calibration reference voltage and the negative terminal connected to the ground reference for analog input.
_aignd_vs_aisense A differential terminal with the positive terminal connected to the ground reference for analog input and the negative terminal connected to physical channel AI SENSE.
_aignd_vs_aisense2 A differential terminal with the positive terminal connected to the ground reference for analog input and the negative terminal connected to physical channel AI SENSE2.
_aignd_vs_aisense3 A differential terminal with the positive terminal connected to the ground reference for analog input and the negative terminal connected to physical channel AI SENSE3.
_aignd_vs_aisense4 A differential terminal with the positive terminal connected to the ground reference for analog input and the negative terminal connected to physical channel AI SENSE4.
_calSrcHi_vs_aignd A single-ended terminal with the positive terminal connected to the calibration PWM and the negative terminal connected to the ground reference for analog input.
_calref_vs_calSrcHi A differential terminal with the positive terminal connected to the internal calibration reference voltage and the negative terminal connected to the calibration PWM.
_calSrcHi_vs_calSrcHi A differential terminal with the positive and negative terminals connected to the calibration PWM.
_aignd_vs_calSrcHi A differential terminal with the positive terminal connected to the ground reference for analog input and the negative terminal connected to the calibration PWM.
_calSrcMid_vs_aignd A single-ended terminal with the positive terminal connected to the calibration PWM and the negative terminal connected to the ground reference for analog input. _calSrcMid is the divided down version of _calSrcHi.
_calSrcLo_vs_aignd A single-ended terminal with the positive terminal connected to the calibration PWM and the negative terminal connected to the ground reference for analog input. _calSrcLo is the divided down version of _calSrcHi.
_ai0_vs_calSrcHi A differential terminal with the positive terminal connected to physical channel ai0 and the negative terminal connected to the calibration PWM.
_ai8_vs_calSrcHi A differential terminal with the positive terminal connected to physical channel ai8 and the negative terminal connected to the calibration PWM.
_boardTempSensor_vs_aignd A single-ended terminal with the positive terminal connected to the onboard temperature sensor and the negative terminal connected to the ground reference for analog input.

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