ReadMultiSamplePortByte(int)
- Updated2026-02-03
- 1 minute(s) read
Reads one or more 8-bit unsigned integer samples from one or more DIChannel objects in a task.
Syntax
Namespace: NationalInstruments.DAQmx
public byte[,] ReadMultiSamplePortByte(int samplesPerChannel)
Remarks
Use this method for devices with up to eight lines per port.
NI-DAQmx read and write methods time out after the amount of time specified by the Timeout property on the task you are reading from or writing to.
Refer to NI-DAQmx Readers and Writers for more information about memory limitations in NI-DAQmx read methods.
Parameters
| Name | Type | Description |
|---|---|---|
| samplesPerChannel | int | The number of samples to read. If you set samplesPerChannel to -1 for a continuous acquisition, the read retrieves all samples available in the buffer at the time of the read. If you set samplesPerChannel to -1 for a finite acquisition, the read behavior is set by the ReadAllAvailableSamples property of the DaqStream you are reading from. |
Returns
A 2D array of 8-bit unsigned integer samples from the task. Each element in the first dimension of the array corresponds to a channel in the task. Each element in the second dimension of the array corresponds to a sample from each channel. The order of the channels in the array corresponds to the order in which you add the channels to the task or to the order of the channels you specify in ChannelsToRead.
Exceptions
| Type | Description |
|---|---|
| NationalInstruments.DAQmx.DaqException | The NI-DAQmx driver returned an error. |
| OutOfMemoryException | There is not enough memory to carry out this operation. |