Networking the T41U5XBB

Ethernet is a great feature of the T41U5XBB. It is very easy to set up and use. You will need:

  • A T41U5XBB breakout board with the Ethernet Option installed.

  • A Teensy 4.1 with the Ethernet chip - TEENYS41 and NOT the TEENYS41_NE.

  • An Ethernet enabled grblHAL build. All of the recent prebuilt binaries from us are set up to run Ethernet. If you do not have Ethernet enabled, this page will get you going.

  • An Ethernet cable. Pick a length that works for your set up.

  • An Ethernet switch or hub.

  • A PC connected to your network.

  • ioSender installed on your PC.

Steps to getting set up to run on Ethernet.

  • Set up the T41U5XBB and get it running with USB. Make sure that ioSender can connect via USB. Close ioSender.

  • Connect the T41U5XBB's Ethernet Jack to the Ethernet switch via the Ethernet cable.

  • Plug the USB cable into T41U5XBB and run ioSender on your PC. Note that the LED on the Ethernet Jack should be flashing. That indicates it is connected. You may need to power cycle the T41U5XBB.

  • In ioSender, open the Console tab. You should see something similar to this. Note the line circled in red. That shows the IP address of the T41U5XBB.


  • Write down the IP address. You will see a sequence of numbers of the form [IP:xxx.xxx.xxx.xxx] where the xxx's are the IP address. Note that the IP Address shown in the screenshot is very likely not your IP address.

  • Shut down ioSender and then unplug the USB cable from the T41U5XBB.

  • Restart ioSender (without the USB cable plugged in but the Ethernet cable should be plugged in). It will take up to 10 seconds to show up and you will see the following:

  • Click on the Network tab. Click on Web Socket and fill in the IP address you saved earlier. It should look like this. Note that the IP address shown is probably not the same as yours. Do not click on OK.

  • Plug the USB cable back into the T41U5XBB. Now, click OK.

  • ioSender should now start up and when you click on the Console tab, you should see something like this. Note the [NETCON: Websocket] line. That indicates you are running over the Ethernet. From now on, ioSender will connect via Ethernet when you start it up.


You can choose to power the T41U5XBB via the USB connection from your PC or via a wall wart USB charger. If you have a source of 5V power available, you can connect it to 5V terminal on the T41U5XBB.


If you need to revert to USB, unplug both Ethernet and USB from the T41U5XBB, replug in USB and start ioSender. It will put up the connection dialog. Click on the Serial tab and select the com port for your T41U5XBB.


And that is all there is to it.

About Me


I'm a CNC enthusiast. I run a small company, Brookwood Design, that makes a 32-bit Grbl breakout board for grblHAL and love to help people get the most out of their CNC machines.


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