Base controller stations are available in 24VDC, 24VAC/DC and 115VAC versions. The on-board I/O consists of digital inputs and outputs. The nanoLine accommodates up to three I/O expansion modules, bringing the total possible I/O count to 24 digital inputs and 16 digital outputs. Optional communication modules for Ethernet, RS-232, RS-485 and USB facilitate data exchange with Modbus TCP or Modbus RTU.Phoenix Contact Inc.www.phoenixcontact.com800.322.3225