Fixed transmissive and reflective sensors (Standard)Multi-position transmissive and full width reflective sensor (Optional)COMMUNICATION METHODSRS-232 auto-sensing serial interface, DB-9USB V1.1, bi-directionalCentronics ParallelEthernet - 10100 internal (optional) offered in combination with USB and Serial interface (replaces Parallel port)Wireless - 802.11bg or Bluetooth 2.0 (optional) with LCD display offered in combination with USB and Serial interaces (replaces Parallel port)