描述
FX系列PLC提供了4种通讯方式：N网络通讯、无协议串口通讯、平行网络通讯、程序口通讯。如果传输的数据量少，大多数PLC与计算机之间通信均可采用串行通信，通信接口均为PLC与工业控制计算机上的RS232接口。由于RS232采用非平衡方式传输数据，传输距离近，对于大功率、长距离，且单机监测信息量多，控制要求复杂的PLC通讯，直接采用RS232方式不能满足传输距离要求。因此，可采用RS485方式。因为RS485采用平衡差动式进行数据传输，适合于远距离传输，并具有较强抗干扰能力
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