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sn75hvd10使用光耦作为接收器出现光耦端电压跌到阈值之下

Other Parts Discussed in Thread: SN75HVD10

sn75hvd10使用光耦作为接收器出现光耦端电压跌到光耦可识别的阈值之下,

1. 该发送器只使用了发送功能,即DE信号是一直有效的

2. 光耦测消耗电流15mA

3. 线缆长度15m

求大神解答,万分感谢.!