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CFA-634 USB


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#1 dm3281

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Posted 02 September 2012 - 10:41 PM

Hi all -- I have a CrystalFontz CFA-634 LCD 20x4 USB that I pulled out of one of my old desktops from 2007. This module looks like the serial version, except it has a USB daughter board on it that has the +5v, D+, D-, GRD wires that go into a USB jack. For fun I downloaded LCD Smartie fromn http://lcdsmartie.so...et/smartied.htm and have it working on my Windows 8 machine. I used to use this back in my XP days and was happy to see it still works under Windows 8! The datasheet can be downloaded from http://www.crystalfo..._Sheet_v1.1.pdf I have a USB cable shown here that hooks into the LCD's USB daugterboard and the other plug into my computer's USB port. http://www.crystalfo...t/WRUSBY03.html I have a .NET class that I have ported for Netduino Plus and ready for testing. My question, how do I wire up this LCD to my Netuduino? Do I plug the +5v to the 5v pin on the Netduino? Do I plus the GRD to the GRD pin on the Netduino? Big question - how to I handle the serial data? I asume I would use D2 (Rx) and D3 (Tx) to send/receive data... I believe this would be COM2 on the Netduino? How do I handle the D+ and D- on the USB daughterboard? Do I need a breakout board or something? I assume these are simple Rx/Tx wires and require something else??? I'm new to all this an any help or direction would be appreciated...

#2 JerseyTechGuy

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Posted 03 September 2012 - 06:10 AM

From what I see, the LCD natively has a DB9 connector for RS-232 Communications. On the USB version a USB Daughter board has been added and the DB9 connector disabled. The Netduino doesn't support USB devices so this wouldn't work. You would need to re-enable the DB9 connector and connect into that.

#3 dm3281

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Posted 04 September 2012 - 11:32 PM

From what I see, the LCD natively has a DB9 connector for RS-232 Communications. On the USB version a USB Daughter board has been added and the DB9 connector disabled. The Netduino doesn't support USB devices so this wouldn't work. You would need to re-enable the DB9 connector and connect into that.


Thanks, Dave.

I guess if I buy the serial port version, then I'd have no problems and can plug directly into the header where the USB is plugged into? I see there is two +5V LCD and +5VLED, then DATA-IN, GRD, etc on the bottom-right-hand header.

#4 JerseyTechGuy

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Posted 05 September 2012 - 10:27 AM

Just curious since you said "I guess if I buy the serial port version"... is there a reason you are choosing this specific LCD display over the many others that members have used? There are many LCD displays with fully working and documented code on this site. Just curious of the choice.

#5 dm3281

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Posted 08 September 2012 - 02:04 AM

Just curious since you said "I guess if I buy the serial port version"... is there a reason you are choosing this specific LCD display over the many others that members have used? There are many LCD displays with fully working and documented code on this site. Just curious of the choice.


No, not particularly. It seems easy to program from .NET and I like the large display. And I can easily use it on my PC with Smartie if I want.




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