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ADS1247使用三线制PT100,怎样判定PT100是否接入

Other Parts Discussed in Thread: ADS1247

ADS1247使用三线制PT100的时候,我发现一个问题,就是不接PT100的话,仍然有温度显示,这个温度可能是固定不变的,也可能是随机跳动的,但是却在我的测温范围内,我怎么才能判定是否接入PT100了呢  最好是从硬件上