CRC16校验源码。CRC域是两个字节，包含一16位的二进制，它由传输设备计算后加入到消息中。接收设备重新计算收到消息的CRC，并与接收到的CRC域中的值比较，如果两值不同，则有误-CRC16 checksum source. CRC field is two bytes, contains a 16-bit binary, it is calculated that by the transmission equipment added to the message. Receiving eq