This product is a 126x32 high-brightness dot matrix graphic display module that uses a single 5V DC power supply, supports 3 ASCII fonts (5x5, 5x7 and 10x14), and comes with SPI and RS232 asynchronous serial interfaces and 8 user I/O pins with key scanning capabilities.
This document describes the GU126x32F-K612A4 dot graphic VFD module, a high‑brightness 126 × 32 display with built‑in VFD glass, drivers and a micro‑controller. It lists electrical, optical and environmental specifications, including a 5 V supply, 600 cd/m² luminance and operation from –40 °C to +85 °C.
The manual explains how to interface the module via RS‑232 or TTL synchronous serial, details the full command set for text, graphics, area operations, macros and EEPROM protection, and provides example code for setting brightness, cursor positioning and custom macros.
| Power Supply Voltage | 5.0 VDC ±10 % |
|---|---|
| RS232 Input Voltage Range | -24 V to +24 V |
| RS232 Output Voltage Range | -5 V to +5 V |
| Logic Input Voltage | 0.8 VDC max / 2.0 VDC min |
| Logic Output Voltage | 0.5 VDC max / 2.4 VDC min |
| Dot Pitch | 0.5 mm × 0.5 mm (horizontal) / 0.65 mm × 0.65 mm (vertical) |
| Luminance | 600 cd/m² |
| Illumination Colour | Blue‑Green (505 nm) |
| Operating Temperature | -40 °C to +85 °C |
| Operating Humidity | 20 % to 65 % RH @ 25 °C |
The factory defaults are 19200 baud with no parity.
Up to eight macros can be stored, and one of them is executed automatically at power‑up.