How far can you run RS485?
RS485能跑多远？
4000 feet or about 1200 meters is the maximum cable length in RS-485 communications. A general guideline, however, is that the product of line length (in meters) and the data rate (in bits per second) should not be more than 108.
4000 英尺或大约 1200 米是 RS-485 通信中的最大电缆长度。 但是，一般准则是线路长度（以米为单位）和数据速率（以每秒位数为单位）的乘积不应超过 108。