NI 9225 (FPGA Interface)
CompactRIO 3-Channel, 300 Vrms, 24-Bit Simultaneous Analog Input Module
FPGA I/O Node
You can use an FPGA I/O Node, configured for reading, with this device.
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Note You can simultaneously read from or write to multiple channels on the NI 9225. You can also synchronize an NI 9225 module with other NI 9225/9229/923x modules. |
Terminals in Software
Use the FPGA I/O Node to access the following terminals for this device.
| Terminal | Description |
|---|---|
| AIx | Analog input channel x, where x is the number of the channel. The NI 9225 has AI channels 0 to 2. Do not access AI channels on multiple modules in the same FPGA I/O Node if the modules are not synchronized or do not use the same data rate. |
| Onboard Clock | Gives access to the onboard clock in the LabVIEW block diagram. The Onboard Clock frequency is 12.8 MHz. Use the FPGA I/O Node in a single-cycle Timed Loop to access this channel. You must export the Onboard Clock of the NI 9225 to access this channel. |
| Start | Channel that controls when the NI 9225 starts acquiring data. If TRUE is written to the Start channel, the NI 9225 starts acquiring data. When the NI 9225 is acquiring data, you must write TRUE to the Stop channel before you can access properties for the module. If FALSE is written to the Start channel, no operation is performed.
Refer to the NI 9225 Getting Started VI in the labview\examples\CompactRIO\Module Specific\NI 9225\NI 9225 Getting Started directory for an example of using the Start and Stop channels.  Open example
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| Stop | Channel that controls when the NI 9225 stops acquiring data. If TRUE is written to the Stop channel, the NI 9225 stops acquiring data. When the NI 9225 is acquiring data, you must write TRUE to the Stop channel before you can access properties for the module. If FALSE is written to the Stop channel, no operation is performed.
Refer to the NI 9225 Getting Started VI in the labview\examples\CompactRIO\Module Specific\NI 9225\NI 9225 Getting Started directory for an example of using the Start and Stop channels. Open example
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Arbitration
This device supports only the Arbitrate if Multiple Requestors Only option for arbitration. You cannot configure arbitration settings for this device.
Methods
This device does not support any methods.
I/O Properties
Use the FPGA I/O Property Node to access the following properties for this device.
| Property | Description |
|---|---|
| LSB Weight | Returns the LSB weight in pV/LSB for the channel. Use this value to convert and calibrate NI 9225 data if you set the Calibration Mode to Raw in the C Series Module Properties dialog box. |
| Offset | Returns the calibration offset in uV for the channel. Use this value to convert and calibrate NI 9225 data if you set the Calibration Mode to Raw in the C Series Module Properties dialog box. |
Module Properties
Use the FPGA I/O Property Node to access the following properties for this device.
| Property | Description |
|---|---|
| Data Rate | Sets the rate at which the NI 9225 acquires data. |
| Module ID | Returns the module ID. |
| Serial Number | Returns the unique serial number of the module. |
| Vendor ID | Returns the National Instruments vendor ID, 0x1093. |
Single-Cycle Timed Loop
You can use the Onboard Clock channel in the single-cycle Timed Loop. You cannot use the other channels on the NI 9225 with the single-cycle Timed Loop. Refer to the Understanding Loop Timing for the NI 9225/9229/923x topic for information about loop timing for this module.
Hardware Documentation
Refer to the NI 9225 Operating Instructions and Specifications to learn about module specifications and how to use the module. Refer to the CompactRIO Related Documentation for further information about CompactRIO documentation.