SERIAL HMI / ROTARY KNOB
LMTQT240240XC-1.28 1.28-inch rotary knob display
240 × 240 px · UART 1200–115200 bps · rotary encoder + push · 12-pin FPC
LMTQT240240XC-1.28 is a 1.28-inch round IPS TFT module built into a rotary knob: 240 × 240 pixels, Ø32.0 mm active area, UART control at 1200–115200 bps and a 12-pin 0.5 mm FPC. The supplier document shows a touch style and a touch-free version. Values are transcribed from the specification; TBD means the supplier has not published the value.
LMTQT240240XC-1.28 specifications
| Parameter | Specification |
|---|---|
| Display diagonal | 1.28 inch (p6) |
| Resolution | 240 × 240 pixels (p6) |
| Active area | 32.0 × 32.0 mm (p6) |
| Module front | Ø50.00 mm (p7) |
| Front body height | 14.00 mm (p7) |
| Rear boss | Ø24.00 × 10.00 mm (p7) |
| Panel / viewing angle | IPS, 70/70/50/70° L/R/U/D (p6) |
| Brightness | 400 cd/m² (p6) |
| Backlight | LED (p6) |
| Interface | UART, 1200–115200 bps (p6) |
| Connector | 12-pin FPC, 0.5 mm pitch (p8) |
| Supply | 5 V, 80 mA backlight on / 4 mA off; 5 V 1 A recommended (p6) |
| Logic levels | TXD/BUSY 3.0–3.2 V; RXD 1.5–3.3 V, 15 V max (p6) |
| Operating temperature | -20 to +70 °C; storage -30 to +80 °C (p6) |
| Touch option | Touch style or touch-free version (p2) |
| Memory | 128 MB flash, 32 MB font space, 200 full screens (p6) |
| Weight | TBD (not published) |
Values above are transcribed from the supplier listing and drawing. TBD means the supplier has not published the value; nothing is estimated or copied from a related model.
Integration notes for LMTQT240240XC-1.28
The module is a complete serial HMI: the host sends commands over UART and the on-board controller draws images, GIF frames, text, QR codes and geometry. The host does not drive the panel directly.
Keep the UART ground and the 5 V supply ground common. The recommended supply is 5 V / 1 A; the module draws 80 mA with the backlight at maximum and 4 mA with it off.
RXD tolerates up to 15 V, so a 5 V host can drive it without a level shifter. TXD/BUSY are 3.0–3.2 V; check the receiving host’s input threshold if it is not 3.3 V logic.
The 12-pin FPC is 0.5 mm pitch. Pin 3 (BUSY) held low at power-up selects the upgrade mode; use the p8 pin table for the full assignment.
Touch and touch-free versions share the panel and firmware platform but differ in the cover stack. Confirm the version in the quotation; do not assume the touch layer is fitted.
What is in the box
| Parameter | Specification |
|---|---|
| Touch style | Knob display with capacitive touch cover |
| Touch-free | Knob display with plain cover, no touch layer |
| Burn-in board | USB / TTL fixture, sold separately (p9) |
Configurations follow the supplier listing. The ordered option is confirmed in the quotation.
Model-specific questions
What resolution and interface does LMTQT240240XC-1.28 use?
240 × 240 pixels on a 1.28-inch round IPS panel, controlled over UART at 1200–115200 bps through a 12-pin 0.5 mm FPC.
Is the display controlled directly over UART?
Yes. The module carries its own controller and command set; the host sends drawing and update commands rather than pixel data.
Is touch included?
Two versions are documented: touch style and touch-free. They are separate order options and must be named in the quotation.
What is needed for a quotation?
Specify LMTQT240240XC-1.28, touch or touch-free, quantity, host UART voltage, cable length and operating environment. Price, stock and lead time are confirmed in the quotation.
Compare related displays
- LMT210480 — 2.1″ 480 × 480 UART rotary knob display
- LMT128015H16 — 1.28″ 240 × 240 SPI TFT panel
- LMT13010C12-V1 — 1.28″ 240 × 240 SPI TFT panel
All display modules · Interface selection guide · Request a quotation for LMTQT240240XC-1.28
Product images and engineering references
