What can the E3568J communication interface resolve?

What can the E3568J communication interface resolve?

RK3568J Industrial HMI Touch Display Interface Overview

The 10.1-inch touchscreen all-in-one device based on the RK3568J chip integrates a quad-core processor, demonstrating strong application potential in industrial automation, smart manufacturing, and equipment monitoring. This article provides an in-depth overview of the primary communication interface features of the RK3568J 10.1-inch touchscreen all-in-one device, helping customers and system integrators better understand and select suitable interface solutions.

CAN Bus Interface

This Panel PC unit features three isolated CAN bus interfaces with a baud rate up to 250Kbps. Its opto-isolation design significantly enhances interference resistance. CAN0 and CAN1 are routed via 6-pin vertical 3.5mm pitch connectors, while CAN2 is integrated with the RS485 interface on an 18-pin connector. Each interface includes a CAN-H high-level signal line, a CAN-L low-level signal line, and an independent isolated ground line.

The CAN interface is suitable for high-reliability, real-time applications such as automotive electronic test equipment, industrial robot control systems, and production line monitoring. Its multi-master capability supports flexible communication with multiple sensors and actuators.

Digital I/O Interface

Digital I/O interfaces are an indispensable component of industrial control systems. This touchscreen display provides 12 digital inputs (DI) and 4 digital outputs (DO), with support for expansion to 12 additional inputs, offering ample channels for acquiring and controlling switch signals in industrial environments.

For digital inputs, the 12 DI channels are divided into two groups: 6 high-level inputs (DIH) and 6 low-level inputs (DIL). Both groups feature opto-isolated protection and utilize 16-pin vertical connectors with a 3.81mm pitch. Each input group has an independent common terminal. Engineers can select whether to ground the common terminal or connect it to the power supply based on the characteristics of the field signals, enabling effective switching between high and low levels.

The 4-channel DO employs relay dry contact outputs, connected via an 8-pin vertical 3.81mm pitch connector. Each relay channel includes a COM common terminal and NO normally open terminal, with a rated load capacity of 5A@30VDC or 5A@250VAC. This allows direct driving of higher-power loads, achieving complete isolation between high and low voltage circuits.

These interfaces are widely used in scenarios such as equipment status monitoring, alarm signal acquisition, motor start/stop control, and valve switching control.

RS485 Serial Communication Interface

As one of the most widely used serial communication standards in industrial applications, this touch-display integrated system provides six isolated RS485 interfaces with a baud rate of 9600 bps. These interfaces share an 18-pin vertical 3.5mm pitch connector with one CAN interface. Each interface includes A signal line, B signal line, and an independent isolated ground wire to prevent ground loop interference. Interfaces are clearly labeled with corresponding serial port numbers (ttyS0, ttyS3, ttyS4, ttyS5, ttyS7, ttyS9) for straightforward software configuration.

The RS485 interfaces support long-distance transmission (theoretically up to 1200 meters) and multi-point communication (connecting up to 32 devices), making them ideal for distributed device networking. Typical applications include PLC communication, inverter control, multi-sensor data acquisition, and building automation system networking.

RS232 Serial Communication Interface

The UART2 debug interface operates at 3.3V logic levels and is accessible via a 4-pin, 2.0mm pitch connector. It includes GND, TX, and RX signal lines, primarily serving system debugging, program downloads, and point-to-point communication with legacy devices. Although transmission distances are limited (typically under 15 meters), it remains valuable for scenarios such as direct communication between individual devices and device configuration maintenance.

Network Communication Interface

The system features three Ethernet interfaces: two Gigabit ports (ETH0 and ETH1, supporting 10/100/1000Mbps) and one 100Mbps port (U-ETH2, supporting 10/100Mbps), enabling network isolation or redundant backup.

The system supports Wi-Fi and Bluetooth functionality (IEEE 802.11 a/b/g/n/ac, BT4.2) via IPEX antenna connectors. A 4G network module can be expanded through the miniPCIe interface, enabling wireless WAN access when paired with a Nano-SIM card slot.

USB and Storage Expansion Interface

The system features two standard USB 3.0 Type-A vertical ports (USB2501 is an OTG port), supporting high-speed data transfer. It includes 32GB of built-in eMMC storage and supports TF card and mSATA-SSD expansion, offering multiple storage options.

Other auxiliary interfaces

The system features audio interfaces, including a MIC microphone connector (1.0mm-2-pin socket), a mono speaker connector (1W/8Ω, 2.0mm-2-pin socket), and an onboard buzzer, enabling voice interaction and alarm notifications. It supports an RTC real-time clock with a coin cell battery socket to preserve time information during power loss.

Power supply utilizes a 12-36V DC wide voltage input, supplied via a 5.08mm pitch 3-pin connector, supporting automatic power-on upon system startup.

Industrial Application Scenarios

The 10.1-inch RK3568J-based industrial touchscreen workstation demonstrates extensive application value across multiple industrial sectors due to its rich communication interfaces and powerful processing capabilities:

• In smart manufacturing, the device serves as a production line HMI (Human-Machine Interface). It communicates with PLCs, inverters, and servo drives via RS485 and CAN interfaces, collects sensor signals through DI/DO interfaces, and controls actuators to build a comprehensive monitoring system.
• For equipment monitoring and data acquisition, multiple RS485 interfaces connect numerous instrument sensors. Data is uploaded to cloud platforms via Ethernet or 4G networks, enabling remote monitoring and predictive maintenance. Local storage capabilities buffer data during network interruptions, ensuring data integrity.
• In the automotive electronics and test equipment sector, three CAN interfaces simultaneously connect multiple CAN buses for monitoring and analyzing complex vehicle networks. Combined with touch display functionality, this enables the development of user-friendly OBD scanners or test bench interfaces.
• In building automation and energy management systems, the device functions as a central controller. It integrates HVAC, lighting, access control, and other subsystems via RS485 interfaces, communicates with upper-level management platforms through network interfaces, and enables unified management and energy-saving control for smart buildings.
• In logistics automation and warehousing systems, touchscreen-integrated devices can be installed in AGV carts or automated storage control cabinets. They communicate with conveyor equipment, barcode scanners, and RFID readers via various interfaces, enabling real-time mobile device scheduling through Wi-Fi or 4G networks.