|Pin# (8pin/DIN)||X-Rite Function||Mac Function|
|4||Signal Ground||Serial Ground|
|Shell||Shield Ground||Shield Ground|
The power is drawn from the other tail(s) of the interface. The center pin is to receive +12v DC power. The outer ring, power ground. The power supply must be capable of delivering 10 to 16 volts clean DC power with a nominal current rating of 100 milliamps. In addition the supply must be capable of supplying a maximum current of 1.3 amps (for 3 seconds while taking readings).