I have an AST-CAN485 Dev Board. I am trying to read RS485 data bytes from a steering angle sensor.
When I scope the signal from the steering angle sensor without any other RS485 transceivers connected I get a clean signal.
But when I connect the AST-CAN485 Dev Board with termination resistors and program the RS485 receive example in the Arduino IDE, the signal get attenuated.
The baudrate is 38400 kbps when I measure with a scope.
Also, I have a DTECH USB-to-RS485 converter and I am able to read data from the steering angle sensor when I connect to it. The signal gets slightly attenuated when I connect to the converter.
Sorry about all the screenshots in one pic. I can only post one media file.
Lastly, even when I connect lines A and B of the steering angle sensor to the AST-CAN485-DEV Board with no power to the dev board, the signal still shows a large attenuation.
Any help getting this working is greatly appreciated.