二、采用CAN-485G远程驱动器达到5公里通信距离：
通过在每台PLC的通信口安装CAN-485G远程驱动器，如下图所示，无中继器时可实现最大通信距离为5公里（9600bps时），这可能是目前无中继器时铜线传输的最大距离，CAN-485G是隔离的透明传输驱动器，该产品并未使用CAN协议而采用了透明传输方式，因此使用CAN-485G后并不需对原有软件作任何修改！CAN信号与RS485信号相比有诸多优点，读者可参看网站的相关文章。
说明：
通信线的截面积比RS485通信线大，应选1mm2的双绞线，由于CAN-485G和CAN-232G（接电脑的RS232口）设计有二对总线端子，按图所示接线也就不存在分支线问题了。
CAN-485G和CAN-232G内部已设计有终端电阻，需将总线的始端和末端上的终端电阻设置开关K拨到“R”（接入120欧终端电阻），而其它站点应拨到“OFF”（不接终端电阻）。

联系人：刘锦玲 销售经理
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