Matrix Orbital Corp

Hello from Spain!!

This is my first time using LCDs. I have got this model: GLK12232R-25-WBL-E. I am trying to connect it to my computer but I am not able to see it in my PC.

These are my connections:
Yellow
Black - GND
Black
Red - 5V
SCL
SDA
GND - black cable from the RS232 adapter.
Rx - green cable from the RS232 adapter.
Tx - orange cable from the RS232 adapter.
5V


I have connected it to my RS232 port (COM1). I have tried to send characters from Hyperterminal and I have tried with MOGD Software. Also, I have tried UProject, but none LCD has been detected.

So, I don't know why anything is detected. Could you help me, please???

Thanks in advanced from Spain and best regards!!!
:-)

Hello ferespgar,

Thank you for your post.

First of, is it possible for you to try to swap pins Rx and Tx. Having the Rx and Tx pins swapped is a common problem.

Secondly, please jumper pins C5 and R1 prior to power up. With this jumper on, the module is set to 19200 baud. Using uProject at 19200 and the proper com port, go to Main tab and click/unclick Backlight and see if this turns the backlight on and off on your GLK12232-25-WBL.

Please let me know hot it turns out.

Hello Rachel!!

thank you very much for your answer. I think that was the problem: Rx and Tx were swapped. But, after solving that, I had another problem which cannot be solved. I connected the chip to 12V by mistake and I burnt it :-(

I am going to ask for a new one, but before that, I want to know how the keypad works with this display. I mean, when I connect a keypad to the display and I press a key, can the character be automatically displayed on? and also, can the character (or the number) pressed be automatically sent to my terminal via the connector rs232? or does it have a buffer where the character is keept and which is displayed or sent via rs232 only when it is ordered to do that? I want it to be done automatically but I don't know weather it is possible or not.

Thank you very much for you help again and best regards form Spain!! :-)

Hi ferespgar,

I am sorry to here that you burnt the display, please note the part number of the display, if your display has a -V in the part number this means that it is capable of doing +9 to +15V. I have created a sticky that will allow you to identify if you have a -V display here.

As for the keypad, by default our keypad is setup so that when you press a key, the display automatically sends the letter that is mapped to that keypress down the RS-232 line. If you would prefer to poll the keypresses you may do so by turning off autotransmit and then using our poll command. These commands can be found in our manual corresponding to the display that you have purchased, and can be downloaded here. If you would like the keypress to be displayed on the screen when it is pressed, you will have to write a simple routine, that when your software receives a keypress, it echos it back down the RS-232 line to the display.

--
Jon