IC693NIU004CA模块

IC693NIU004CA模块一般情况下不需要增加终端电阻，只有在485通信距离超过300米的情况下，要在485通讯的开始端和结束端增加终端电阻。尤其是485总线上设备数量较少时。当设备数量较多时（如超过22台）。一般不需增加终端电阻，因为终端电阻会降低485总线的负载能力，球机终端120Ω匹配电阻的连接方式如下：球机终端120Ω匹配电阻可通过在球机底盘上的拨码开关拨码来连接。球机出厂时，120Ω匹配电阻默认为未接入，可通过把拨码开关的第10位拨到ON，把120Ω匹配电阻接入线路。反之，如果不接入120Ω匹配电阻，则把第10位拨到OFF即可。

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