The ONSITE-CB-SM is a high-performance CAN-bus communication converter with 2 CAN interfaces and 1 fiber optic interface. The converter supports interconnection and interoperability between 100M fiber optic network and CAN-bus with communication rate from 5kbps to 1Mbps, which further extends the application range of CAN-bus and fiber optic, and the ONSITE-CB-SM converter provides a web configuration interface so that users can flexibly set the operation parameters of the ONSITE-CB-SM converter. The ONSITE-CB-SM is designed with high industrial standards; the communication interface is isolated from the system and has certain anti-interference and anti-surge capability, which is widely used in industrial control and data communication system.