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3504 Serial Communication via RS232

Hi, I tried to use USB to RS232 to serial communicate with 3504 with HD, HE and HF ports. I checked the connections, which HD -> Pin 5, HE -> Pin 3, HF -> Pin 2, is correct, and I even tried HE -> Pin2 and HF -> Pin 3. But I am still not able to found my devices through Itool scan. The adapter I am using is working one. Right now, I only can communicate with my device through IR clip.
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