Product Name
4-inch Human-Machine Interface
Product Features
No operating system, featuring Android display effects and experience, 480*480 resolution, with configuration, capacitive touch, WIFI (optional), supports Lua scripting, EMI radiation meets Class B standards for clinical medical use
Application Fields
Indoor environment, multimedia applications, replacement of Android systems, IoT fields such as conference/medical/home appliances
Hardware Functions
1. This product has no operating system and can operate immediately upon power-on, featuring Android display effects and experience;
2. Built-in vector anti-aliased fonts, capable of displaying ASCII, GBK, UNICODE fonts of any size or custom fonts;
3. Memory supports JPEG, PNG (semi-transparent/fully transparent) image compression, supports storage of any size, and supports image rotation, zoom-in, and zoom-out functions;
4. Supports common GUI displays such as text, images, animations, audio, video, and curves;
5. Supports various configuration controls: button controls, text controls, dropdown controls, progress bar controls, gauge controls, curve controls, slider controls, selection controls, icon controls, animation controls, data logging, image rotation, RTC controls, and QR code controls;
6. The system is equipped with a built-in virtual keyboard that supports both Chinese and English input methods, and the system keyboard can be customized;
7. It supports Lua scripting and internal command operations, eliminating the need for user MCU participation, and easily achieving various logical operations and conversion functions for various proprietary protocols;
8. It can pre-store more than 10 languages, eliminating the need to modify the UI, and allowing for one-click switching to the desired language for the system;
9. It supports upgrading firmware via SD card, replacing boot LOGO, video advertisements, and other applications;
Product Size
Product Architecture
The 4-inch human-machine interface processor adopts a 32-bit dual-core high-speed processor with a clock frequency of 400MHz, internally integrating DDR memory, video H264 decoding, JPEG image decoding, and other functions.
| Product Series | IoT Type |
| Core Processor | 800MHz 32-bit dual-core processor |
| Operating System | An embedded real-time operating system that starts running the |
| protocol type | default private configuration instruction set after 4 seconds of power-on. The host computer can configure it to run MODBUS RTU and XGUS protocols. |
| Scripting language | LUA script version 5.3, allowing user-written logic, protocols, and algorithms to run internally on the screen. |
| Size | 4.0 inches |
| Resolution | 480*480 |
| Installation direction | Supports installation and display at 0, 90, 180, and 270 degrees of rotation. |
| Storage space | 128Mbit |
| Font Library | Built-in vector font, edge anti-aliasing processing, supports any size ASCII, GBK, GB2312, UNICODE (global languages) font libraries, and can also customize any computer font display |
| Image Storage | Supports JPEG, PNG (semi-transparent/fully transparent) compression, supports any size image storage. Can store approximately 138 full-screen JPEG images (calculated based on a size of 86.7KB per image, BMP format is not recommended). The image compression ratio varies, and this value may fluctuate up and down |
| Color | 65K colors, 16-bit RGB |
| Voltage | 5-36V |
| Standby Power Consumption | Backlight at its dimmest, no speaker: 1.2W |
| Maximum Power Consumption | Backlight at full brightness, no speaker: 2.4W |
| Communication mode | RS485 |
| Communication baud rate | RS485: 1200~115200bps, typical baud rate: 9600bps |
| Communication connector specification | 2EDG3.81-4P |
| Image download | SD card/RS485/WIFI |
| Real-time clock (RTC) | Supports countdown, timer, year, month, day, and other time displays |
| Effective display area of the screen (AA) | Length × Width = 71.9mm × 70.2mm |
| Product Dimensions (Length * Width * Height) | Length × Width × Height = 90.7mm × 90.7mm × 27.9mm (Maximum Height after Installation: 12.9mm) |
| Video Playback | MP4 video format, sharing storage space with images. If a video file with a resolution of 800*480, video bitrate of 2400Kbps, and frame rate of 25Hz occupies 17.8MB/minute of storage |
| WIFI | Using BL-M8189FS6 module, supporting 2.4GHz-2.48GHz frequency band, supporting both network card mode and hotspot mode, configurable into wireless serial port transparent transmission mode, compatible with TCP/IP protocol, FTP protocol, HTTP protocol |
Product Competitiveness
| Learning Cycle | 30 minutes to familiarize with the development environment, 3 days to complete human-computer interaction design |
| Program Debugging | The host computer integrates a "virtual serial port screen", no need to connect hardware, directly debug with Keil IDE bound to it |
| Startup Time | Power-on display |
| Configuration controls | Features a wide range of configuration controls, including multi-language support, buttons, text, dropdown menus, progress bars, sliders, gauges, animations, QR codes, curves, historical curves, data logging, circular progress bars, and sub-screen sliding controls |
| System keyboard | Integrated virtual numeric and character keyboards, supporting both Chinese and English input methods, with customizable keyboard options |
| Data logging | Supports exporting data logging control content to an SD card |
| Layer technology | The system incorporates multiple display layers for faster switching |
| Boot LOGO replacement | Supports replacement via SD card insertion |
| Remote upgrade | Supports remote serial port upgrade of screen firmware, engineering files, specified images, configuration files, and fonts (requires WIFI model) |
| Information push | Supports cloud-based push of videos or advertisement display, or mobile APP communication with screen display (requires WIFI model) |
| Multi-language function | Up to 15 global languages can be preset at the factory, with one-click switching to the desired language, eliminating the need for multiple sets of UIs |
| Logical operation processing | The host computer embeds a LUA script parser, allowing users to customize various complex logical relationships and protocols within the screen, meeting 99.9% of customer product function requirements |
| Reliability | All products have passed industry-standard high and low temperature, ESD, burst pulse, and radiation tests |
| Lifecycle | Uses traditional big-brand processors, with continuous availability for many years |
LCD display
| Display type | IPS LCD screen |
| Backlight tube | LED |
| Brightness (cd/m²) | 250 |
| Backlight lifespan (h) | >20,000 |
| Contrast ratio | 800:1 |
| Viewing angles (L/R/T/B) | 80/80/80/80 |
Touch panel
| Touch type | Capacitive touch screen |
| Capacitive touch method | Single-point, sliding touch |
| Capacitive screen transmittance | Above 90% |
| Capacitive screen touch count | Capacitive screen touch count is theoretically unlimited, and touch life is related to working environment (dust, humidity) |
Pin definition
1 GND Power ground
2 VCC Power supply
3 A RS485 Data A terminal
4 B RS485 Data B terminal
Product Architecture
The 4-inch human-machine interface is a serial display terminal that integrates TFT display driver, image and font storage, GUI operation, RTC, audio and video, WIFI, and various configuration controls. The user's microcontroller can easily display text, images, and curves by simply sending and receiving corresponding serial commands.
The IoT-type serial display processor utilizes a 32-bit dual-core high-speed processor with a clock frequency of 800MHz, internally integrating DDR memory, video H264 decoding, audio MP3 decoding, JPEG image decoding, and other functions. The system architecture is shown in the figure below:
The main advantages of choosing a high-performance 32-bit dual-core processor architecture are as follows:
A dedicated 32-bit high-speed processor optimized for image display, featuring a 2D acceleration engine, JPEG image hardware decoding, H.264 video hardware decoding, and MP3 audio hardware decoding, enabling smooth and gorgeous display effects with various special effects.
Embedded real-time operating system, capable of reliable operation for 24*365 hours without power interruption, with no junk or redundant files.
Development Documentation
To complete product development faster, beginners can log in to the official websitewww.modbus.cnand enter the "Download" section to download the corresponding technical documentation.
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