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I have been trying to connect this display with the graphic composer and have not had any sucess. I have connected TX/RX to a standard PC serial port and setup the composer to use that com port but it will not communcate with that device. I have also tried using the Graphic Loader. but I haven't been able to get eather program see the display for programming. I was thinking about getting USB-5V but would that require a uUSB to connect to a pc? is the USB-5V only a power connection?
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Have you used TTL or RS-232 hardware levels? If you used RS-232, then the display may well be zapped.kingartjr wrote: I have been trying to connect this display with the graphic composer and have not had any sucess. I have connected TX/RX to a standard PC serial port and setup the composer to use that com port but it will not communcate with that device. I have also tried using the Graphic Loader. but I haven't been able to get eather program see the display for programming. I was thinking about getting USB-5V but would that require a uUSB to connect to a pc? is the USB-5V only a power connection?
Yes, the USB-5V is only a power connection. You need to use it in conjunction with the uUSB
Don...Don McKenzie
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I connect the device to power in demo mode and I get the demo to work.
I then remove the Demo jumper and power. I then connect the TX/RX signals to a pc COM3. I set the software to COM3 and it still doesn't see the device.Comment
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kingartir,
I am assuming that you are using one of the modules with 1-8 MB of flash memory installed (you got the demo images to run with the demo jumper on and power applied). If you then try to connect to a PC RS232 serial port, you stand a good chance of doing serious damage to the module. The module is designed to operate at TTL logic levels (0-3.3 VDC), not RS232 (0-12 VDC). If you are interfacing to a system that uses TTL 0-5 VDC logic, you must place a current limiting 1K resistor in series on the Rx line. You will need to use something like the Maxim 232 line driver or some other level shift device to protect the I/O pin circuits when interfacing to a PCs serial port.
Unfortunately, you may have already damaged the I/O pin circuits the first time you connected the device directly to the PC serial port. The demo would still run, but you may never be able to send/receive serial commands with that display.
On the older (flash memory) modules, I have used the uUSB-MB device with great success. On the newer GMD1 & PMD2 modules, I use the uUSB-MB5 (the difference being the fifth pin connection on the -MB5 for the new RESET pin). Also the -MB5 device is the easiest and safest way to update the PmmC (personallity modules) on the GMD1 and PMD2 devices.
uUSB-MB http://www.dontronics-shop.com/product.php?productid=16497&cat=318&page=1
uUSB-MB5 http://www.dontronics-shop.com/product.php?productid=16660&cat=318&page=1
I hope this helps and good luck,
SteveAny technology, sufficiently developed, is indistinguishable from magic. A.C. Clark(RIP)
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