说明：  CAN总线与消防设备接口：由于大多数消防设备都采用RS232标准的串口通讯，因此，我们可以充分利用51系列单 设备传来的数字信号接收进来，放入一个缓冲区中，按CAN数据传输协议打包成CAN数据包后，再 之也可。
(CAN bus interface with the fire-fighting equipment: fire-fighting equipment as the majority have adopted the standard RS232 serial communication, so we can make full use of 51 series from a single device to receive incoming digital signal into a buffer, according to CAN data Transfer Protocol CAN packaged into data packets, then it can be.)