TDMS Read (G Dataflow)

Maximum number of data elements to read for each channel.

Default: -1 — Causes this node to read all available elements.

Number of data elements into the .tdms file at which this node begins to read.

Default: 0

A reference to a .tdms file. Use the TDMS Open node to obtain the reference.

Channel group on which to perform the operation.

Reading Behavior When group name in Is Not Wired

If you do not wire data to group name in, this node reads data from the current group in the file. The current group is either the first group in the file when you run this node for the first time or the nth group at the nth loop iteration when you run this node continuously for multiple loop iterations. The order that this node reads groups is the same order that the TDMS List Contents node returns groups. If this node attempts to run after reaching the last group, you receive an end of file error.

Note  

The TDMS List Contents node and the TDMS Get Properties node reset the current group to the first group in the file. Resetting the current group to the first group in the file impacts the group read by the next TDMS Read node when you do not wire group name in.

Channel or channels to read data from.

channel name(s) in accepts a string or a 1D array of strings. The data type varies according to the data you wire to data type.

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error	error in contains an error
If no error occurred before the node runs, the node begins execution normally. If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.	If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

The type of data you want the node to return.

This input accepts the following data types:

• Analog waveform or a 1D array of analog waveforms
• Digital waveform
• Digital table
• 1D or 2D array of:
  • Signed or unsigned integers
  • Timestamps
  • Booleans
  • Alphanumeric strings that do not contain null characters
  • Floating-point numbers, including the following specific data types:
    • Single-precision and double-precision floating-point numbers
    • Complex single-precision and double-precision floating-point numbers
    • Extended-precision floating-point numbers

A Boolean specifying whether the node returns data channels in the same order as they exist in the .tdms file.

Default: False

A reference to the .tdms file.

Channel group on which you performed the operation.

If you do not specify a group name, this output returns Untitled.

Channel or channels on which you performed the operation.

If you do not specify a channel name, this output returns Untitled.

Data that the node read from the .tdms file.

If data has scaling information, the node automatically scales the data.

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error	error in contains an error
If no error occurred before the node runs, the node begins execution normally. If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.	If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

A Boolean that indicates whether the node has reached the end of the file.