This document is the user manual of QDM12864A-01, which introduces the appearance, interface, parameters and protocol of the product.
The QDM12864A-01 is a smart LCD display terminal that integrates all necessary display and graphics functions into its controller, allowing users to send characters, graphics and control commands through a serial interface without additional hardware design. It features a 128×64 dot STN LCD panel capable of showing four lines of Chinese text or ASCII characters.
The manual details the physical dimensions, connector pinouts, rated electrical parameters, and the UART‑based communication protocol. It also lists the complete command set for operations such as clearing the screen, moving display regions, adjusting backlight brightness, and configuring baud rates, enabling quick integration into user projects. This manual is written in Chinese.
| Display resolution | 128×64 dots |
|---|---|
| Display lines | 4 lines, 8 Chinese characters per line |
| Font ROM | 8192 Chinese 16×16 characters, 128 ASCII 16×8 characters |
| Operating voltage | DC12V (range DC9‑25V) |
| Rated current (backlight on) | 80 mA |
| Rated current (backlight off) | 18 mA |
| Backlight | LED, continuously adjustable brightness (1‑255) |
| Interface options | RS232 2‑wire or 3‑wire, TTL 2‑wire serial |
| Operating temperature | -20 °C to 70 °C |
The terminal operates from a DC12 V supply (acceptable range DC9‑25 V) and draws up to 150 mA, typically 80 mA with the backlight on and 18 mA with it off.
Send the command 0xEE followed by a LUM value between 1 and 255; the terminal will set the backlight intensity accordingly.
The clear‑screen command is 0x52; transmitting it will erase the current display memory.