1 Review 
 SF104-9623 is an isolated CAN bus communications board can be easily applied with PC104 + bus slot of computer. PC operating system can use the popular Windows family, Unix and other operating system environment. CAN is a digital bus communication standard, the use of bus arbitration for network management, real-time high, can ensure the system's response to events, and communication reliability, CAN reliability requirements of high prices is mainly used in the system. 
 (2) performance and technical parameters 
 2.1 Technical parameters 
 ? CAN channels: two 
 ? CAN network communication speed up to 1Mbit / s 
 ? Isolation voltage: 1000Vdc 
 2.2 The use of environmental requirements 
 ? Operating temperature: -10 ℃ ~ 40 ℃; Relative Humidity: 40% to 80%; Storage temperature: -55 ℃ ~ +85 ℃; 
 2.3 Power Consumption +5 V/300mA 
 2.4 Dimensions 
 ? Dimensions (without bezel): L × H = 120mm X 92mm 
 3 Works 
 SF-9623 Isolated CAN bus communications board 104 + and CAN bus interface part of the communication part. 104 + bus interface part of the implementation of the communication board and the PC data interface, control logic within the circuit design by the CPLD logic implementation, the bus width of 8 bits. CAN communication part of the implementation of the CAN physical layer and data link layer protocol, mainly by the CAN network interface controller SJA1000T (Philips) to achieve the network transceiver uses 82C250 (Philips), connect the interface via DB-9 to achieve.