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ISO1450: RS422 Half Dublex Receive Problem

Part Number: ISO1450

Tool/software:

Hello,

We are using ISO1450 for Half-Dublex communication with RS422.

In our application ISO1450 only receives RS422 signal from rs232 to rs422 converter. The converter is connected to the sensor. But there was a problem to receive. The issue is when we try to connect converter to the ISO1450, voltage level on the B pin side is drops. 

The oscilloscope images are:

Without ISO1450 connection:

With ISO1450 connection.

I need to mention that we enable both Receive Enable and Drive Enable pins.