Description

Industrial RS232 hub that allows multiple devices or controllers (PLC/PC) to communicate without conflict. Built-in isolation ensures stable and reliable serial data transmission in automation and Modbus systems. DIN rail design.

The 2-channel buffered RS232 hub is an industrial communication gateway designed to manage data exchange between host and slave devices in RS232 networks. It allows multiple RS232 hosts to access a single slave device without communication conflicts, and it can also be used to expand the number of slave devices in an RS232 branch or bus system.

To improve communication reliability, the unit uses photoelectric isolation to reduce signal interference and help maintain stable data transmission. A built-in 10K data buffer helps coordinate multiple communication requests at the same time, while intelligent data frame recognition improves response speed and helps detect abnormal communication errors more quickly.

Each RS232 channel features 6kV lightning protection, photoelectric isolation, and up to 3kV isolation voltage. Every channel also has an independent ground design, so if one RS232 bus is damaged, devices connected to other RS232 channels remain protected. The power input port also includes 6kV lightning protection for additional system safety in industrial environments.

• 2-channel buffered RS232 communication hub
• Allows multiple masters to access one slave without conflicts
• Can also expand the number of slave devices in an RS232 network
• Photoelectric isolation helps reduce interference and improve stability
• Built-in 10K data cache for coordinating simultaneous communication
• Intelligent data frame recognition for faster response and error handling
• 6kV lightning protection on each RS232 channel
• Up to 3kV isolation voltage
• Independent grounding for each channel
• 6kV lightning protection on the power input port

Features

• Flexible Communication Modes: Supports multi-master to one-slave communication (multiple controllers accessing one device), as well as one-master to multiple-slave mode. Default configuration supports two masters to one slave, with configurable mode switching.
• Industrial Isolation Protection: Each RS232 channel features up to 3kV photoelectric isolation with high-speed optocouplers, reducing signal interference and ensuring stable data transmission.
• Independent Channel Design: Each RS232 interface has its own isolated ground and shielding interface, preventing cross-interference between channels and improving system reliability.
• High-Level Lightning & Surge Protection: Each RS232 port and power input supports up to 6kV lightning protection (IEC61000-4-5 standard), protecting equipment from surges, induced voltage, and electrical spikes.
• Full Electrical Isolation: Power supply and all RS232 channels are fully isolated from each other (up to 3kV isolation), helping prevent damage propagation between connected devices.
• Built-in Data Buffer: Integrated 10K byte cache enables smooth handling of simultaneous communication requests and reduces data collision risk.
• Configuration Software Included: Supports configuration of communication modes and RS232 parameters via dedicated software.
• Wide Power Input Range: Supports 9–70V DC input, suitable for various industrial power environments. Power interface also includes lightning protection.
• Power Protection Features: Includes overload protection and reverse polarity protection for enhanced system safety.
• Industrial-Grade EMC Performance: Designed to meet high-level electromagnetic compatibility standards for reliable operation in harsh environments.
• Fanless Design: Passive cooling ensures silent operation and improved long-term reliability with reduced maintenance needs.
• Wide Operating Temperature: Designed for industrial environments with operating range from -40°C to +85°C.
• 100% Burn-In Tested: All units are fully tested before shipment to ensure stability and performance.

Applications

Application 1: Two Masters Access One Slave Device

This application shows how the RS232 Isolation Hub allows two master devices to communicate with one RS232 slave device without data conflict. In this example, a PLC and a PC are both connected to the hub, while the hub connects to a single flowmeter (Modbus slave).

In a normal RS232 system, one master device usually communicates with one slave device directly. If two hosts need to access the same slave, communication conflicts, unstable data transmission, or device errors may occur. The RS232 Isolation Hub solves this problem by coordinating communication between both masters and the shared slave device.

This makes it possible for the PLC to handle control tasks while the PC is used for monitoring, configuration, diagnostics, or data collection at the same time. The hub manages the communication path so both masters can access the slave device in an organized and stable way.

Built-in photoelectric isolation, independent channel protection, and data buffering help improve communication reliability in industrial environments. This is especially useful in automation systems where one field device must be shared by both a control system and a service or monitoring computer.

• Master devices: PLC + PC
• Slave device: Flowmeter / Modbus slave
• Main benefit: Two masters can access one slave without RS232 communication conflict
• Typical use: Simultaneous control, monitoring, configuration, and maintenance