Matrix Orbital Corp

When I connect my lcd2041 with my ardunio via serial and standard 19200 I get only a triangle per string I send.

When I connect my arduino to the pc-rs232 and send the same string it looks good.
When I connect my display on the pc-rs232 it also looks good.
But arduino with display doesn't work!

Then I've read that I should us an rs232 to ttl converter. I did.
I use an max232 without success.

Is there anything else I can do too get this display working?
Or do I only wast my time?

Thanks for answering.

Hi Wiikii,

Thanks for the question, sorry to hear that you have been having some trouble communicating with your LCD2041 through your Arduino. From what I can tell, you are communicating via RS232 at TTL levels. For the display to receive TTL level signals a couple jumpers must be moved.

If you've got a PCB revision 2.0 unit, you can follow the steps outlined in section 2.3 on pages 11 and 12 of you manual. If you've got a different revision, the process will be much the same, and can be found in the appropriate manual listed here.

Thanks,
Troy

Hello Troy.

As I wrote before. I use Hardware Release 1.20 and on the display is Version 1.55 written . So the manual just says that I can change the baud rate and or the i2c master or slave address.

As I also tried to explain before, I use a max232 to convert from ttl to rs232 level.
It still doesn't work.

PC -> Display is OK
Arduino -> PC is OK
Arduino -> Display doesn't work.

Do you maybe know where the problem could be elsewhere located?

Hi,

I wonder if you try a null modem cable connection between the Arduino and the display. Ie. try swapping RX and TX.

The Arduino and the display both act as DCE, one will have to act as DTE for them to communicate.

Please let me know how it turns out.

Best Regards,