2、传输距离远(最远10Km),传输速率快(1MHz bps);
3、节点数量最多可达110个。
4、采用短帧结构,每一帧的有效字节数为8个;
5、实时性高,非破坏总线仲裁技术,优先级高的节点无延时;
6、出错的CAN节点会自动关闭并切断和总线的联系,不影响总线的通讯;
7、报文为短帧结构并有硬件CRC校验,受干扰概率小,数据出错率极低;
8、通讯介质可用普通的双绞线,同轴电缆或光纤等;
9、可以点对点,一点对多点及全局广播几种传送方式接收数据。
RS485接口标准特点:
(1) RS-485的电气特性:逻辑“1”以两线间的电压差为+(2-6)V表示;逻辑“0”以两线间的电压差为-(2-6)V表示。接口信号电平比RS-232-C降低了,就不易损坏接口电路的芯片,且该电平与TTL电平兼容,可方便与TTL 电路连接。
(2) RS-485的数据传输速率为10Mbps
(3) RS-485接口是采用平衡驱动器和差分接收器的组合,抗共模干能力增强,即抗噪声干扰性好。
(4) 因RS-485接口具有良好的抗噪声干扰性,长的传输距离和多站能力等上述优点就使其成为的串行接口。
区别:
1、速度与距离
2、错误检测机制
3、价格与培训成本
4、总线利用率
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