Table Of Contents

User Command Reference

Last Modified: May 17, 2017

The NI 5771 allows you to configure the clock, ADC, sampling, and other settings with the User Command, User Data 0, and User Data 1 signals.

User Setting User Command User Data 0 Value User Data 1 Value User Return Value
Clock Settings 0 0 = Internal Sample clock

1 = Internal Sample clock locked to an external Reference clock through the CLK IN connector

2 = External Sample clock through the CLK IN connector (disables the CLK OUT connector)

3 = Internal Sample clock locked to an external Reference clock through Sync Clock

N/A N/A
ADC Self-Calibration 1 N/A N/A N/A
ADC Full Scale Range 2 Gain Setting = 0x0000 to 0x01FF

0x0000 = 560 mV, Minimum

0x0100 = 700 mV, Nominal

0x01FF = 840 mV, Maximum

0 = AI 0

1 = AI 1

N/A
ADC Offset 3 Positive Offset = 0x0000 to 0x00FF

Negative Offset = 0x0100 to 0x01FF

(0.176 mV per LSB)

0 = AI 0

1 = AI 1

N/A
TIS Mode 4 0 = TIS mode disabled

1 = TIS mode enabled

0 = AI 0

1 = AI 1

N/A
Frequency Adjust DAC Value 5 DAC value = 0x0000 to 0xFFFF N/A N/A
Read User EEPROM 6 EEPROM address to read data. N/A Read data
Write User EEPROM 7 EEPROM address to write data. Write data N/A
Exported Sample Clock 8 0 = CLK OUT disabled

1 = CLK OUT enabled

Note: If you set this signal to a nonzero value and your device is already configured to use the external Sample clock through the CLK IN connector, the User Command Status signal returns a nonzero value indicating that the command was unsuccessful.

N/A N/A
Reinitialize 0xFF N/A N/A N/A

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