LabVIEW 2018 Real-Time Module Help
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Keep the following considerations in mind when using an NI Linux Real-Time target. You also can visit ni.com/info and enter the Info Code Linux to learn more about the NI Linux Real-Time operating system.
- The FTP server is disabled by default, and you cannot use it in safe mode. NI recommends using WebDAV as the file transfer mechanism for improved security.
- Virtual memory is supported, which implies the following:
- A process crash restarts the process without restarting the target.
- Monitoring the largest contiguous memory block does not provide useful or necessary information on NI Linux Real-Time targets.
- System Exec VI is supported.
- Time zone changes do not require a target restart.
File System and Directory Structure
- The file system is case-sensitive.
- Directory paths display in Linux format. For example, paths use forward slashes and do not contain drive letters. If you open a VI created for Phar Lap ETS or VxWorks targets in an NI Linux Real-Time target context, the Windows-like paths automatically convert to Linux-like paths.
- NI Linux Real-Time targets enforce file and folder access permissions. Refer to the KnowledgeBase for information about these permissions.
- The RTOS deletes the content in the temporary folder /tmp on target restart. The temporary folder allocates space from RAM up to a maximum size of 64 MB.
- The c:\ni-rt directory does not exist on NI Linux Real-Time targets. Refer to the KnowledgeBase for information about the directory mapping on NI Linux Real-Time targets.
- Direct modification of the ni-rt.ini configuration file is highly discouraged. Modification of this file may result in incorrect system behavior.
||Note Some NI troubleshooting procedures require manual edits to this file. Take care to precisely follow troubleshooting documentation in these scenarios.
- WebDAV is enabled by default.
- SSL is enabled by default.
- NI Web-based Configuration & Monitoring is available in safe mode.
- It is only possible to configure a target reachable via IP address (DHCP, link-local, or static). mDNS is used for target discovery.
- You cannot use the Console Out using NI Web-based Configuration & Monitoring on NI Linux Real-Time targets. Instead, connect your NI Linux Real-Time targets to a computer using a serial port to view the output of the Console Out. Refer to the KnowledgeBase for detailed information about how to use the Console Out.
- You can log in to a target using NI Web-based Configuration & Monitoring, SSH, or a serial connection. Refer to your hardware documentation to learn about enabling SSH on your RT target.
||Note NI recommends you set a password to log in using SSH or a serial connection.
- To reset a forgotten administrator password, you must physically access the target and reset all settings to the factory default. Contact NI for assistance with this process.
- Your target creates an admin user that is equivalent to the root user in Linux systems.
||Caution Do not create users in NI Web-based Configuration & Monitoring with the same name as system accounts. For example, do not create a user named root or ssh. Doing so overwrites the system account.
- SSH supports public keys as an alternate form of authentication.
- Visit ni.com/info and enter the Info Code RTSecurity to keep informed about security as it relates to NI products.
The LabVIEW Real-Time Module does not support certain LabVIEW features for VIs that run on RT targets. For instance, if you attempt to deploy and run a VI that has unsupported functionality on an RT target, the VI might still execute. However, the unsupported functions do not work and return standard LabVIEW error codes. The LabVIEW Real-Time Module does not support the following features on RT targets that run the NI Linux Real-Time RTOS:
- ActiveX VIs
- NI TestStand VIs (ActiveX-based)
- .NET VIs
- Report Generation VIs
- Windows Registry Access VIs
- Report Express VI (Uses the unsupported Report Generation VIs)
- Graphics & Sound VIs
- Database Connectivity VIs
- Menu functions
- Cursor VIs
- IrDA functions
- File System Web Service LabVIEW API
- Analysis Workspace to Reduce Jitter in Mathematics and Signal Processing VIs
- Call Library Function Nodes that access an operating system API other than NI Linux Real-Time
- Open/Create/Replace File function interactively using a file dialog box
- Clear indicators when called option of the Execution Properties page
- Auto Configure option of the Create Histogram Express VI
Certain Advanced TDMS functions
Certain MathScript functions
- Profile Buffer Allocations window
- Output Page of the LabVIEW MathScript Probe window—You can use the rt_debugoutput function to send debug strings to the standard output device instead.
- Largest Available Memory Block Property Node—This property node does not provide useful information for NI Linux Real-Time targets and returns an error if used. Use the Free Physical Memory property node instead.
- Latch Until Released and Switch Until Released Boolean mechanical actions—Refer to the KnowledgeBase for information about why these Boolean mechanical actions do not work on RT targets.