Hello everybody,
I have a Power board control DC motor Treadmil. I can not read the data from controller board to power board.
Power board using IC NUVOTON N76E003 (8051 core). it have 4 pin( VCC, GND, 2 line data TX and RX).
As image below, data always pulse transfer and receive also. It difficult to get data.
So Do you know the way read it? Please share me.
Thank so much!

 

Photo diode transfer and receive data from control board ~

 

The commonly used opto on quite a few of these boards use a type of 817 opto-isolator ic .
You would need to take a reading of the data as it is being sent, a 'scope would be the ideal way.
Max.

 

It would be great if you can confirm the following:
i) (on the power board) that the Rx and Tx opto signals are connected to one of the 2 UART ports on the N76E003, that is, pins 2&3 or 8&18.
ii) (on the scope trace fulse.png ) that high level means logic '1' at the N76E003.

If my assumptions are correct then the trace looks somewhat like an asynchronous format, perhaps one of modes 1, 2 or 3 (N76E003 datasheet table 13-1). A Serial Protocol Analyzer is a good tool for capturing and interpreting these sorts of signals.

 

Unfortunately i have not had any personal experience with that particular model.
Max.

 

It would be great if you can confirm the following:
i) (on the power board) that the Rx and Tx opto signals are connected to one of the 2 UART ports on the N76E003, that is, pins 2&3 or 8&18.
ii) (on the scope trace fulse.png ) that high level means logic '1' at the N76E003.

If my assumptions are correct then the trace looks somewhat like an asynchronous format, perhaps one of modes 1, 2 or 3 (N76E003 datasheet table 13-1). A Serial Protocol Analyzer is a good tool for capturing and interpreting these sorts of signals.

Thank for your opinion. N76 IC use pin 16 17 connect to control board. it does not UART interface, so difficult to determine it

 

Control Board use IC MA82G5BXXAD32 and pin 23 and 24 used to communication data.
Power board use IC Nuvoton n76e003 and pin 16 and 17 used to communication data.

 

Thanks for the detailed information about the micro controller connections. I do not know the protocol for these signals.

 

It would be great if you can confirm the following:
i) (on the power board) that the Rx and Tx opto signals are connected to one of the 2 UART ports on the N76E003, that is, pins 2&3 or 8&18.
ii) (on the scope trace fulse.png ) that high level means logic '1' at the N76E003.

If my assumptions are correct then the trace looks somewhat like an asynchronous format, perhaps one of modes 1, 2 or 3 (N76E003 datasheet table 13-1). A Serial Protocol Analyzer is a good tool for capturing and interpreting these sorts of signals.

thank so much