Electron Tube
Electron tubes may be placed inside factory controllers, in which they function as boolean logic operators for redstone connections. When placed, they are referred to as "logical tubes".
Figure 1. Logical tubes in each of the 4 modes, powered on and off
Figure 2. A logical OR operator taking inputs from factory gauges and outputs to a redstone link
Each logical tube may be connected with 0 or more redstone inputs, and outputs a redstone signal according the rules of a logical operator, determined by its mode.
The available modes are:
- OR
-
Output on when any connected input is on. Otherwise output off. When unconnected, output off.
- AND
-
Output on when all connected inputs are on. Otherwise output off. When unconnected, output on.
- NOR
-
Inverse of OR.
- NAND
-
Inverse of AND.