A primary device for connecting to a secondary device is provided, including at least three electrical contacts, a voltage source, and a controller, wherein each electrical contact has an associated high switch connected between the contact and the voltage source, and an associated low switch disposed between the contact and electrical ground, and wherein the controller is connected to each of the switches and is configured to sequentially close pairs of switches to connect the voltage source to the device during an orientation operation, each pair of switches comprising a high switch associated with one of the contacts and a low switch associated with another of the contacts, and is further configured to record a voltage difference between the contacts associated with a plurality of pairs of the switches, and to determine an orientation of the secondary device relative to the primary device based on the recorded voltage difference.