I'm having a problem trying to drive a display thru a USB port. I'm using USB>serial adapter out of a laptop. Then the cable from the adapter to the GAZ is DB9 serial to two banana plugs (supplied with the display board).
The displays work fine when connected directly to a Tag CP705 or to a Timy. When connected to the laptop it appears that the signal is being transmitted (because the Tx led is flashing on the USB/Serial adapter). I've tried every combination of selecting COM ports on the laptop and every combination on the GAZ board (thumb wheel adjustment, 2400/9600 baud rate, toggle switch position and turning the power off and on again on the GAZ when trying new settings).
Is it possible that the ALGE serial/banana plug cable supplied with the display is just a little too long. I don't know if the distance capabilities might be reduced when trying to drive this out of a USB port? Could that be my problem?
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