Products › Sensor Expansion Adapter For Xo Image 1 of 1 Sensor Expansion Adapter For Xo CA$0.00 Used for connecting multiple sensors to Xo. If using a single sensor, use the Single Sensor Adapter Cable instead. Port 1: Select Port 1 SDI-12 Analog Pulse Counter Port 2: Select Port 2 SDI-12 Analog Pulse Counter Port 3: Select Port 3 SDI-12 Analog Pulse Counter Quantity: Add To Cart Added! Used for connecting multiple sensors to Xo. If using a single sensor, use the Single Sensor Adapter Cable instead.