Use cases

• Programmatically identify all of the network IPInternet Protocol describes the fundamental mechanisms for transferring information in the form of data packets addresses associated with the RT target or PC host
• Especially useful when multiple network adapters are available, e.g., USBLANUSB-based local area network (LAN) established between the Academic RIO and the PC host computer. , Ethernet (wired), and Wi-Fi (wireless)

Features

• Easy to code
• Use as a stand-alone VI or incorporate the code directly into your block diagram
• Report IP addresses in either dot-decimal notation or as human-readable machine names
• Code runs on either the RT target or PC host without modification

Keep in mind

• Each reported IP address is only reachable by other hosts on the same network. For example, 172.22.11.0 designates the USBLANUSB-based local area network (LAN) established between the Academic RIO and the PC host computer. network created by connecting the Academic RIO Device to the PC with the USB cable. The RT and PC are the only hosts on this network (addresses 172.22.11.2 and 172.22.11.1, respectively).

LabVIEW block diagram elements

Locate these elements with "Quick Drop" (press Ctrl+Space and start typing the name); click on an icon to see more sample code that uses that element:

Example code

• Connect your Academic RIO Device to your PC using USBLAN, Ethernet, or Wi-Fi. NOTE: Not all Academic RIO Devices have Ethernet and Wi-Fi connectivity options.
• Download and unpack the rt_show-available-ip-addresses.zip (for use with NI myRIO 1900) or the NIELVISIII-rt_show-available-ip-addresses.zip (for use with NI ELVIS III) archive, and then double-click the ".lvproj" file to open the project. NOTE: This project was written for a NI myRIO 1900 or NI ELVIS III connected by USBLAN at IP address 172.22.11.2. If you are using a different IP address or another Academic RIO Device (Example: NI myRIO 1950 or NI RIO Control Module) do the following:
  • If using the NI myRIO 1950 or NI RIO Control Module start with the NI myRIO 1900 Archive.
  • Different IP address: Right-click on the "NI myRIO 1900" Device, choose "Properties", and then enter the new IP address
  • Different device:
    • Right-click on the top of the project hierarchy, select "New Targets and Devices", keep the "Existing target or device" option, and then find and select your particular device
    • Select all of the components under the "NI myRIO 1900" device: click the first one and then shift+click the last one
    • Drag the selected components to the new device
    • Right-click the "NI myRIO 1900" device and select "Remove from project"
• Run “RT Main” and “PC Main” and observe the following:
  • Each VI executes the same subVI “show available IP addresses.vi” once every half second and displays its results
  • Click the “dot-decimal notation?” control to switch between the machine name and the IP address
  • If you are using the USB cable to establish the network link between the Academic RIO Device and the PC, you should observe that the PC is host #1 (172.22.11.1) and the RT is host #2 (172.22.11.2) on the USBLAN network 172.22.11.0
  • “PC Main” will likely show other networks such as your wireless connection
  • “RT Main” will also show address 127.0.0.1 (“localhost”) – this address is for loopback testing and is internal to the RT target (in fact, every network host has its own loopback address)
• Enable the Academic RIO Device wireless connection while “RT Main” is running; a third IP address appears

Expected results

Developer walk-through

Outline

• Review overall structure:
  • RT Main (same as PC Main)
    • Run “show available IP addresses” VI every half second
    • Display available IP addresses in either dot-decimal notation or as a user-friendly string in the form “machine.domain”
  • “show available IP addresses” VI
    • “String To IP” with “Multiple Output” option enabled returns all active network addresses
    • “IP To String” converts these numerical values to strings
• Locate the functions subpalette
  • Data Communication | Protocols | TCP

Related content

Tags:

• networking
• IP address
• dot-decimal notation

Targets:

• RT
• PC

LabVIEW VIs and block diagram elements:

• String To IP
• IP To String