I have the GLK19264-7T-1U device.
There's a communication problem with the device. It turns ON, but it seems that it doesn't detect the bits that I'm sending.
I did the following configurations:
- Disconnected all 3 zero-ohm resistors from the RS232 jumpers,
and connected 2 zero-ohm resistors to the TTL jumpers. - Then, I connected wires to the "Power/Data Connector".
Pin 1 - Power
Pin 2 - RS232 Rx (connected to UART Rx)
Pin 3 - RS232 Tx (connected to UART Tx)
Pin 4 - GND - Configured UART to work as following:
- Character Length - 8 bit
- NO parity bits. (they do NOT exists while communicating)
- baud rate = 19.2 kbps
- 1 start bit and 1 stop bit.
- The LSb (Least Significant bit) is sent first.
The display turns ON, but there is NO communication.
My micro-controller can send up to 3.3v at i/o pins, but that must be detectable by the GLK19264-7T-1U device, because that's a legal TTL '1' logic level voltage.
Also, I tried to supply 5v or 3v to the Power pin (pin 4). None worked.
While writing this message I started to get the feeling that maybe I need to switch between the Rx & Tx pins of the Power/Data connector... Maybe that's the problem?
Anyway, I also wanted to note that the datasheet doesn't mention enough details about the RS232 communication, regarding the parity bit, start/stop bits, legal logic levels voltage etc.
Moreover, some tips about reducing power consumption would be MUCH helpful for me - my power supply is a battery (with approx. capacity of 0.5mAH)...
Thank you!
Best regards,