reads the complete contents of the buffer on a device.
reads n elements from the buffer.
reads elements from the buffer until the device-specific criterion crit is met.
reads elements associated with the parameter param.
reads elements associated with the parami.
- A device can be specified either by a DeviceObject or by a string representing a device class.
- DeviceReadBuffer is a blocking function; when called, it communicates with the device and does not return until it has the data it needs.
- Not all devices have buffers. For those that do not, DeviceReadBuffer generates a message.