I cannot figure out what format the packet needs to be to send and receive data via Serial (usb).
ie DATA {LCR}
With a Com port viewer I can see only the EOT symbol when the cancel button is pressed on the keypad.
I have tried Hex, ASCII, DEC, base64 and Binary. Just cant communicate with this device. All communication protocol settings are correct.
- Half Duplex
- 9800 Baud rate
- 7 data bits
- Even Parity
- 1 stop bit
Any hint would be very helpful. Thanks.