Hi kfaria,
Can you please tell me the version number of your VK204-25?
Thank you.

Hi kfaria,

Instead of sending 254 96 in Sub Akr_off(), please try sendiing 254 126 1.

Please let me know how it turns out

Hi kfaria Okay, now we know that the command is being sent. But the problem is even if it is sent, you still see repeated data coming on the RS232 lines on about 2ms apart? I just want to know how you can actually tell that the module did not follow command 254 96 (since in the original code, after ...

Hi kfaria, I do not see anything wrong with the code. Have you seen A == 3? Since this is the only branch that will actually send the command 254 96, make sure that you actually get the value 3. By the way, there is really no need to clear the keypad buffer every single time you read a keypad key. T...

Thanks for posting. I do not see any reason for the module not to follow command 254 96 and turn off auto repeat mode. Do you mind sending a piece of your code?

Sounds good.

I hope that it'll work out as expected.

Hi bigred1521, On the LK202-25 borad, above the DB9 connector is the RS232 IC, and above it are 4 solder pads. From left to right, lets name the pads 1 to 4. If pads 1 and 3 are soldered, then the module is set to RS232. If the pads 2 and 4 are soldered, then it is set to TTL levels. Again, if the L...

Hello thefloyd666,

I am glad to hear that your problem has been fixed.

For the keypad problem, please try setting the debounce time. It can be done by cmd 254/85/8. 8 is the recommended value for setting debounce time that would result to 52ms.

Hello bigred1521, Thank you for your post. When connecting the BS2 Stamp to the LCD, the LCD needs to be set in TTL levels, unless there is a RS232 driver after the BS2. When the LCD is set to TTL levels, it will not work with Hyperterminal. You mentioned that you tried hard setting the LCD, I wonde...

Unfortunately, no. You will just have to declare an unsigned char array; so instead of:

char string1[] = "Hello";

you will need to have
unsigned char string1 [] = {'H', 'e', 'l', 'l', 'o', 0xFE};

to squeeze in 0xFE

Hi arney, I'm glad that you have figured out what was wrong. Just so you know, you can also communicate with the LCD2041 via TTL and with TTL you wouldn't need an RS232 converter. Please see the manual how to configure the LCD2041 to TTL levels and so you may connect the PIC directly to the LCD. If ...

Hi arney, I hope that you won't have to keep working on it too long and that we will hopefully get somewhere. Do you have an oscilloscope? I suggest that we go down on the pins and see what is actually happening. Also, at this point, how is the LCD acting, do you at least see 'H and 'I' (lots of the...

Hello arney, Now that you have posted your code, we can look at what's happening. First of all, I would like you to confirm if the following link contains the same datasheet that you are using for the PIC: http://ww1.microchip.com/downloads/en/DeviceDoc/39626b.pdf I have based the following observat...

Hi arney,
No problem with getting back later. Have fun with house hunting. Good luck!

Hi arney, There is just no reason for the display to stop displaying the characters you send it. I am not quite sure when you said you used a HEX terminal program to talk to the LCD and send it commands. What was the result of this? Was the LCD behaving as it should? Say if you connect the LCD to a ...