Hi i am using CU20045SCPB-T31A VFD Display, through MATLAB am trying to send data using serial communication and through RS-232 to RS-485 connecter i connected to display. The following below is the my MATLAB code

s=serial('COM3','Baudrate',19200);

set(s,'stop bits',1);

set(s,'databits',8);

fopen(s);

fwrite(s,'HELLO');

but instead of HELLO am reciveing different symobls in display...please help me out

Hello Moka,

Thank you for your question.

First off, could you provide your signal wiring and jumper configuration? (J0 - J4 and JA)

Thank you,

Noritake VFD

hi thanks for your reply.

Actually i got the display finished product form from the vendor company so i dont have access to jumpers configuration

but before using MATLAB i send serial data using HYPER TERMINAL with a BaudRate of 19200 and i received the data whatever am sending

Moka,

Be sure to check all comunication settings from your hyper terminal session. Not only baudrate, but parity as well. This module's default parity value is EVEN. However, since you cannot see the jumper configuration, it is difficult to say which parity mode is being used.

Based on your MATLAB code, you do not set any parity, so this could be the issue.

Best Regards,

Noritake VFD

hi thanks for your suggestion i tried with EVEN parity but didnt get the output. I am trying to check for jumper configurations and let you know the jumper configurations

hi the default configurations of signal and jumper configurations only used. i tried with different baudrates also but still not getting proper output

Moka,

Can you check your signal voltage? The display module expects 5V signals.

Additionally, make sure you have common ground between your PC interface and VFD interface.

Best Regards,

Noritake VFD

Moka,

Can you check your signal voltage? The display module expects 5V signals.

Additionally, make sure you have common ground between your PC interface and VFD interface.

Best Regards,

Noritake VFD

Thanks Noritake

i am receving the data whatever am sending.But For the same code sometimes the data transmitted is retaining in the disply and sometimes it is displaying the data in that particular instant only

Moka,

Can you explain your issue in a bit more detail?

I am having a difficult time understanding your most recent post.

Thank you,

Noritake VFD

Thank u Noritake

The data Which I am sending to the VFD display unit through matlab  is displayed only for a small fraction of time after executing the code  and  the display unit screen is getting cleared and some times the previous data and the present data means executing the code for second time are displayed till I switch off the display unit.

Moka,

That is quite strange behavior.

Is your matlab code only sending "Hello World" to the display? (like the code from your first post)

If not, can you send the code you are current working with?

Thank you,

Noritake VFD

hi the following below is my matlab code

s=serial('COM3','BaudRate',38400,'Timeout',10,'Terminator','LF');

s.databits=8;

s.stopbits=1;

fopen(s)

fwrite(s,'heloo');

Thank you

Moka,

Thank you for providing your code.

I would like to clarify your exact issue.

When you execute your code, "heloo" is displayed on the screen but the screen is cleared shortly afterwards.

Additionally, when you execute the code again, you can see two "heloo" strings on the display until you turn the display off.

Is this correct?

Best Regards,

Noritake VFD