How to Set Up a Wireless Network with an Ender Modem

Placing the Modems

Craft a Wireless Modem and place it on the side of a Computer, Advanced Computer, or Turtle. Right-click the modem to open its interface and note the channel number. Place a second Wireless Modem on another Computer or Turtle. Set both modems to the same channel so they share a network.

For cross-dimensional or long-range links, use an Ender Modem instead. Craft it and attach it the same way. Ender Modems communicate across dimensions without needing line of sight, which makes them useful for linking a base Computer to a remote Turtle.

Linking Computers

On each Computer, open the Lua shell and call rednet.open("top") (replace top with the side the modem is attached to). Then send a message from one machine with rednet.send(id, "hello") and receive it on the other with rednet.receive(). Both machines must have their modems opened on the same side name.

If you need a wired link instead, craft Networking Cable and a Wired Modem. Run the cable between two Wired Modems attached to Computers. Wired networks do not need channels and are immune to interference, but the cable must connect the two modems directly.

Testing the Link

Run a short script on the receiving Computer that loops rednet.receive() and prints the sender ID and message. Send a test string from the other machine. If nothing arrives, confirm both modems are on the same channel, both rednet.open calls succeeded, and no other program is holding the modem.