DS-7604NI-E1/4P U-boot problem

[Eric Osman]

Hi all,

I tryed to update my chinese recorder and it went wrong....
Now i want to try to U-boot, so i start Putty and make a connection this all go's well but whenn the recorder boots i get these strange text ( chinese? ) And i also cant start u-boot by pressing Crtl+U...

Here a printscreen:


Does anyone have the same problem / know's how to fix?

 

[alastairstevenson]

I'd say you are using an RS232 interface, not a Serial TTL interface. The signal levels are quite different and are not compatible.
Or - less likely - the baud rate etc is not 115,200/N81

 

[Eric Osman]

I'd say you are using an RS232 interface, not a Serial TTL interface. The signal levels are quite different and are not compatible.
Or - less likely - the baud rate etc is not 115,200/N81

Could you please sent a printscreen how the settings should be ?

 

[alastairstevenson]

This is my PuTTY serial config for the serial to TTL USB convertor.

I would bet money though, that you are using a regular RS-232 interface, with bipolar signals +-3v to +-12v amplitude.
What is needed is unipolar signals, 0 - 3.3v or 0-5v also known informally as TTL serial.
Very commonly used for small board computers like Arduino or RPi etc.

 

[Eric Osman]

This is my PuTTY serial config for the serial to TTL USB convertor.
View attachment 8883
I would bet money though, that you are using a regular RS-232 interface, with bipolar signals +-3v to +-12v amplitude.
What is needed is unipolar signals, 0 - 3.3v or 0-5v also known informally as TTL serial.
Very commonly used for small board computers like Arduino or RPi etc.

Thanks! becuase of this i started U-boot and fixed my recorder
Is there a possibility to buy you a beer?

 

[alastairstevenson]

Brilliant! Well done indeed.
I'm having a virtual beer to console myself over the bet I had with myself, that the 'Chinese characters' were due to RS-232 vs TTL serial, that I lost.