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The Item Router can accept inputs from Buildcraft Pipes, RedPower 2 Tubes, and Applied Energistics ME Networks; however, the Item Router will only output to the air, an adjacent inventory, or a Buildcraft Pipe. Item Routers can also pull things off a Conveyor Belt placed on top of them if that item has a valid route in the router. Due to the ability of the Item Router to output items to the air, the top of the router is a valid input but not output to avoid items bouncing in and out forever.
The item router works as a whitelist. Items will be taken from the input (the top face), and redirected to any of the other five faces, indicated by the color of the corners. In this example, the item router will send each colour of wool out the corresponding face. Items which do not appear anywhere in the table are considered "unmapped", and the system responds to them with the following set of rules.
- If the Reject Unmapped option is toggled to "YES", unmapped items are ignored, and do not enter the system.
- If the option is toggled to "NO":
- If there are any routes (colors) with no items mapped to them, they become the default output for any unmapped items, in top-to-bottom priority (black > blue > green > yellow > red).
- If all routes have at least one item mapped, then unmapped items are rejected as if "Reject Unmapped" were toggled to "YES" (per rule 1).
In the example below, yellow wool would be ignored at the input face. If Reject Unmapped were toggled to "NO", then yellow wool would exit the black face. If an item were then mapped to the black face, yellow wool would exit the yellow face, as it is the highest priority route with no items mapped.