Customizing the boot screen of your Crystalfontz 632 (16×2) or 634 (20×4) intelligent serial LCD module is an excellent way to personalize your hardware projects, server racks, or custom PC builds. By default, these rugged displays show a standard manufacturer welcome message upon power-up. However, you can easily overwrite this non-volatile memory with your own custom text or branding.
Here is how to modify your Crystalfontz boot screen quickly using official, free software tools. Prerequisites and Hardware Setup
Before opening the software, ensure you have the correct hardware connections established:
Connection: Connect your Crystalfontz 632 or 634 module to your host PC using a standard serial cable or a USB-to-serial adapter (depending on your specific display variant).
Power: Ensure the display is properly powered via its data cable or a separate power connector.
Software: Download and install ⁄634 WinTest, the official testing and configuration utility provided free of charge on the Crystalfontz website. Step-by-Step Boot Screen Customization
Launch WinTest: Open the Crystalfontz ⁄634 WinTest utility on your Windows PC.
Configure COM Ports: Select the correct COM port assigned to your display from the software drop-down menu. Set the baud rate to match your module’s current hardware jumper settings (the factory default is typically 9600 or 19200 baud).
Establish Communication: Click the initialization or connect button to verify that the software is successfully talking to the display. You can test this by typing a few characters into the live text entry box.
Compose Your Message: Locate the text fields inside the WinTest interface corresponding to the rows of your display.
For the Crystalfontz 632, you have 2 lines of 16 characters each.
For the Crystalfontz 634, you have 4 lines of 20 characters each.
Tip: Spaces count as characters. Center your text manually by adding spaces before your words.
Save to Boot Memory: Once your custom message looks exactly how you want it on the preview screen, locate the command button labeled “Set Boot Screen” or “Save Current State as Boot State” (Command 4 in the Crystalfontz packet architecture). Click it.
Test Your Work: Power down your display module entirely, wait five seconds, and turn it back on. Your new custom branding will immediately flash onto the screen. Troubleshooting Tips
Garbled Text: If you see random symbols instead of your text, your baud rate in WinTest does not match the hardware baud rate of the display. Cycle through the available baud rates until the text clears up.
Screen Does Not Save: Ensure you are using the specific “Set Boot Screen” command and not just writing temporary text to the screen. Temporary text clears the moment power is lost.
If you want to take your display customization further, let me know:
Are you using the USB or RS-232 serial version of the module?
Do you need the raw command hex codes to program this programmatically via Linux or Python?
I can provide the exact steps or code snippets for your specific setup.
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