Atlona Help Center

KB01191 - How to access the web interface of a JUNO-451


Subject: How to access the web interface of a JUNO-451


  • Confirm you have a DHCP enabled router
  • If no DHCP enabled router is available, please see steps below for how to access JUNO-451 via a static IP address
  • Confirm the port to which the JUNO-451 is being connected to on a router supports DHCP (try connecting another device such as a computer to this port and see if it gets an IP address issued)

Steps: The AT-JUNO-451 comes with DHCP enabled by default. This means the unit can be connected to a DHCP enabled router and have an IP address issued to it.

  1. To access the units web interface, you can:
  2. Press and hold the INPUT button on the front of the unit for 20 seconds, the power button will flash from BLUE (on state) to RED (stand by state) and back to BLUE two times to signify that STATIC IP is enabled and flash two times when STATIC is disabled and DHCP is turned back on.

Statis IP address:



  1. Alternatively, you can send a RS232 command to the JUNO-451 to get its current IP info. This command is “IPCFG” followed by a carriage return. (see below for more info)
  2. You can also perform a network scan on your network/access the routers web-gui and see what devices are attached to it. Some routers also have their own web interfaces that show the IP info of devices that are connected to it.
  3. To send a command to the JUNO via RS232, connect to the unit using a captive screw to DB9 cable coupled with a USB to DB9 cable. For an article on how to create such a cable, see here.
  4. After creating this cable, use your favorite serial program to communicate with the switch. Hterm is a great program for Windows and CoolTerm is a great program for MAC’s. Below are the steps to use HTerm:
  5. Open HTerm and start a connection by choosing the correct COMM port and baud rate (115200):

*Please note, port #’s may change*

  1. You should see the following message in the bottom right corner of the program:
  2. Next, send the IPCGF command to the unit in order to get a response with the IP info: Please note, the command will need to be sent with a carriage return thus make sure the “send on enter” section states “CR”
  3. After sending the IPCFG command, you will then see the units IP configuration and current IP address. If you don’t see any IP address or see all 0’s, this means your network was unable to issue the Atlona unit a DHCP address. This might be because the network is configured to work with static IP address’ or that there is an issue with said network. To test your network, connect another DHCP enabled device and see if that it issues an address. If it is, please try factory resetting the Atlona unit by sending it the following command via Hterm: “Mreset + <carriage return>”. After that, try step 3 again.

After sending the “IPCFG + <carriage return>” command, if you see an IP address get reported from the switch such as shown above, you can type this address into any PC that is on the same network as the JUNO-451 and access its web interface. Login credentials are:

Username = root  

Password = Atlona (case sensitive)

Alternatively, some routers have their own web interfaces you can access to see what devices are currently connected to that unit.

  1. If you want to scan your network or are able to see a list of devices currently connected to the router, you can use the MAC address’ for Atlona devices which starts with “B8”. Therefore, it’s a good sign that devices with that MAC address’ beginning with B8 on your network are Atlona devices and you can try acceding those IP address’ via your web browser.
  2. You can also use a free IP scanner such as those you can download from the Google Play Store and iTunes App store. Please note, for the network scan to work correctly, your phone/pc will need to be connected to the same network as the Atlona device.

Article ID: KB01191


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