大家好，我在使用ADM2486进行TTL转RS485时，用到了如图所示电路，但是发现电路不工作，485输出没有任何信号，请问可能的原因是什么？ RE和RTS我使用的一个高发低收的触发信号，Vdd1的+3.3V使用的dsp28335板子过来的+3.3V；Vdd2是使用的经过DC-DC隔离之后的+5V电压。这个电路将PV直接与+3.3V连接是否正确？万望不吝赐教，谢谢。
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