8255 Chip
With input/output circuit of i8255 PPI (or equivalent), the 8255 chip is mounted on the double direction digital input/output devices that can be used by switching the number of input/output points.
Edge Detection
In DAQ-LV-WIN, detecting the change of the input signal using the function of the digital input/output device is called edge detection.
The function used is an interrupt or trigger function.
Sampling
Generally, it refers to repeated input (data acquisition) with a relatively short cycle.
There is also a method using a software timer etc, but DAQ-LV-WIN expresses a hardware method of using the device function as sampling.
By setting the sampling clock and trigger condition in advance and executing it, you can continue to collect data at specified timing without interruption by using a buffer memory etc. that stores sampling data.
Diagnostic program
You can actually run the device and check if the device driver is correctly installed.
Also, a text file that saves diagnostic results is called a diagnostic report.
Devices
Our PCI and PCI Express bus boards and USB modules are collectively called devices.
Device Driver
It is software for controlling peripherals (devices) of computers.
In order to use DAQ-LV-WIN, it is necessary to install a device driver corresponding to the device to be used.
The device driver is included in the attached media of the product, but we recommend using the latest version on the website.
Device Manager
It is a management tool that can be used for device management of computers in Windows OS.
In addition to checking the installation status of the device, you can check and change the device name, run diagnostic programs on our device.
Device Name
This is the name assigned for our product to identify the device.
Even when multiple devices are used, it is possible to specify a specific device from the VI by this device name.
Synchronization Control Connector
Some of our devices have a connector on the board. By connecting the other control board with the synchronous control cable attached to the product, you can share control signals and perform synchronous operation.
In DAQ-LV-WIN, the signal used in this connector is expressed as "synchronization control signal".
Trigger
It refers to conditions and signals for controlling start and stop of continuous input and output.
In DAQ-LV-WIN, set the trigger to control start with "Trigger setting" VI and control stop with "Stop setting" VI.
Binary Value
For example, in the case of an analog device with 12 Bit resolution, as the operation of hardware, a value is obtained by dividing the voltage range of the setting range by 4096 (12 Bit), and this value called a binary value.
Example: In case of ± 10 V range
The binary value 0 corresponds to -10V, the binary value 2047 corresponds
to about 0V, the binary value 4095 corresponds to +10V,
The voltage difference of 1 binary value is about 0.004883V (4.883mV)
Example: For 0 to 5 V range
The binary value 0 corresponds to 0V, the binary value 2047 corresponds
to about 2.5V, the binary value 4095 corresponds to +5V,
The voltage difference of 1 binary value is about 0.001221V (1.221mV)
Although the voltage value is intuitively
easier to understand, since the binary value is a value handled as it
is in hardware,
It does not include calculation errors that occur during voltage conversion.
It can be thought of as a more accurate value accordingly.
Also, as in the example above, it is a feature
that the voltage value indicated by the binary value changes depending
on the range setting.
The way of thinking is the same for current.
Fail-safe Function
It is a function of some remote type devices, and it is possible to change the output status of any output terminal when the communication link is down or there is no access for a certain period of time.
Use utility software (CONTEC Device Utility) for setting.
The output terminals used for the fail-safe function can be used in the same way as other output terminals under normal conditions, but the output with the write VI cannot be performed during the fail-safe activation.
Reset using the fail-safe function VI of the advanced function to return to the normal state.