Ethernet Fieldbus Gateways Although countless industrial devices and systems use Modbus for communication, the Ethernet and serial versions of the protocol are not designed to communicate with each other. Moxa offers a selection of Modbus gateways that provide seamless coordination between devices designed for Modbus communication on different media. Fieldbus Boards Moxa's CAN interface boards include Universal PCI, PCI Express, and PC/104-Plus solutions. Moxa has more than 20 years of experience in board design, and provides high quality interface boards with ESD/surge protection and driver support. For dealer/reseller/quantity pricing please call our staff at 800-222-0172 or log in to the Preferred Partner Pricing Program by clicking here.