Wireless Modem

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Revision as of 14:02, 9 April 2013 by Zaptross (Talk | contribs) (added note to top that modems can send via specific channels)

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This page is for the Modem blocks. For the modem API, see Modem (API)
Grid workbench.png   Modem
WirelessModem.png
Item ID 4094
Damage Value 1
Peripheral? Yes- Modem (API)

Modems are blocks which can be used to wirelessly transfer data between computers and turtles, using the Rednet API or the Modem API. To place a modem on a side of a computer, right-click to place the modem while sneaking.

It is also possible to turn the modem on and off by typing "rednet.open ( side )" to open and "rednet.close ( side )" to close.

Modems can send messages to other modems located up to 64 meters away, or 16 meters during a thunderstorm. As of 1.4 Modem range is increased with higher altitudes. If there is no thunderstorm, the range will always be higher than 64, and at max altitude you would have a range of 384 meters.

In 1.4 and 1.41 there is a miscalculation that causes the range to only be 381 meters at max altitude.

As of the 1.5 update for ComputerCraft, Wireless Modems can send messages on specific channels.

Recipe

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Modem



Example (Modem API)

  • Place 2 computers and add modems to them by clicking the right mouse button while sneaking.
  • Access them, and start Lua.
  • Once Lua has started, wrap your modem using peripheral.wrap() (something like "modem = peripheral.wrap("<side of modem>")
  • Type "modem.open (<A modem port number, anything from 1 to 65535>)" on one computer.
  • Check if there exists a connection: a dim, red light should be found on the modem.
  • Now, type "modem.transmit (<Same number as above>, <Also the same number>, 'Your message')" on the other computer. This should send your message to all computers connected.
  • Opening the first computer should show the message written on the second computer.


Modem as a Peripheral

To use a Modem as a peripheral, you need to either call a method directly using peripheral.call(), or, wrap the modem using the Peripheral API. Wrapped modems provide all functions listed in the Modem API.

For this example, we have a Modem connected to the top of our Computer, we are going to open channel 5:

-- Immediately invoke a method without wrapping
peripheral.call("top", "open",5)
-- You can also "wrap" the peripheral side to a variable:
local modem = peripheral.wrap("top")
modem.open(5)