The Class 2 bus can be wired in one of two ways, Star configuration and Loop configuration. Both have their advantages and disadvantages.

The Star configuration connects each controller using a single wire from each computer. The wires are spliced together at a single location using a Splice Pack (also called a Star Connector). A splice pack is a connector-like component that uses a removable bus bar that connects all of the controllers together. The advantage of the Star configuration lies in its relative ease of diagnosis. The splice pack provides a convenient location in which to diagnose electrical problems associated with the Class 2 bus. The disadvantage is that there is no built-in redundancy to the system. If an open occurs on one of these wires, the controller will no longer be able to communicate on the bus.

The Loop configuration uses two wires connected to each controller. One of the wires will connect to the next controller on the loop while the second wire connects to the previous one. This creates a loop of controllers all holding hands, as it were. Each wire carries identical information, so there is no specific "input" or "output" wire. The advantage is that with two wires, there is redundancy built into the system. If an open occurs on one wire, the message can still be sent via the second one. The disadvantage is in the relative difficulty of diagnosis. Because there is no central location where the bus comes together, you must isolate sections of the bus to do electrical checks.