MILESTONE ELECTRONICS
RS232 to RS232 / RS422 / RS485 Converter (5V Adaptor)
The LD2535U is a flexible serial converter that enables devices using RS232 to communicate with RS232, RS422, or RS485 equipment. Powered by a 5V adaptor, it provides stable and reliable signal conversion for industrial automation, process control, and communication networks.
- Converts RS232 to RS232, RS422, or RS485 communication standards
- Supports differential signaling for improved noise immunity and longer transmission distances
- Powered by a 5V adaptor for energy-efficient and simple installation
- Suitable for industrial automation, building management, and data acquisition systems
- Enables RS485 multi-device bus communication from a single RS232 source
Max Resolution
1080p Full HD
Audio Input
Stereo Analogue
Output
Single HDMI
- In-house manufactured
- 24hr response
- 2,000+ clients served
Product Overview
What makes the LD2535U
The LD2535U converter allows equipment with RS232 communication interfaces to communicate with RS232, RS422, or RS485 devices. This flexibility makes it useful for integrating legacy serial devices with modern industrial communication networks without requiring changes to the source equipment.
RS232 communication is commonly used for direct device-to-device communication. RS422 and RS485 protocols extend this capability by providing improved noise immunity, longer transmission distances, and the ability to support multi-device bus networks. By supporting all three output formats, the LD2535U enables efficient system integration across a wide range of serial communication environments.
For RS422 operation, the converter uses differential signal pairs comprising +TX, -TX, +RX, and -RX lines. This differential signaling approach significantly reduces the effects of electrical noise and interference, making it well-suited for industrial environments where signal integrity is critical over extended cable runs.
The LD2535U operates from a 5V adaptor, keeping power consumption low and simplifying installation within communication racks, control panels, and industrial enclosures. The adaptor-based power configuration allows the converter to be deployed quickly within existing communication infrastructure.
Input Standard
Output Standards
RS422 Signaling
RS485 Bus
Power Supply
Application
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Key Features
Built for reliable serial communication
Three output standards. One compact converter. Stable data transmission across RS232, RS422, and RS485 communication environments.
Multi-Standard Serial Conversion
The LD2535U accepts RS232 input signals and converts them to RS232, RS422, or RS485 output. This single-device capability removes the need for multiple converters when working across different serial communication standards.
- RS232 to RS232 conversion
- RS232 to RS422 conversion
- RS232 to RS485 conversion
RS232 Interface Compatibility
The converter accepts RS232 signals from computers, controllers, data loggers, and other standard serial equipment. It processes TX, RX, and GND signals to ensure accurate data transmission without signal degradation.
- Compatible with computers, controllers, and data loggers
- Accurate TX, RX, and GND signal processing
- Suitable for instrumentation and monitoring equipment
RS422 Differential Signal Support
For RS422 communication, the LD2535U uses differential signaling with +TX, -TX, +RX, and -RX signal pairs. This approach reduces the effects of electrical noise and interference, supporting reliable point-to-point communication over longer cable distances.
- Differential signaling with +TX, -TX, +RX, -RX pairs
- Improved noise immunity in industrial environments
- Suitable for process monitoring and automation systems
RS485 Multi-Device Bus Support
The converter supports RS485 communication, allowing multiple field devices to share a single communication bus. This enables computers or controllers to communicate with several RS485 devices simultaneously within the same network.
- Multiple devices on a single RS485 bus
- Suitable for building management and automation systems
- Enables distributed monitoring installations
5V Adaptor Power Supply
The LD2535U operates from a 5V adaptor, ensuring efficient power consumption and stable device performance. The low-voltage power requirement makes it straightforward to install within communication racks and control panels.
- Low-voltage 5V adaptor operation
- Efficient power consumption for continuous use
- Simple installation within existing infrastructure
Stable and Reliable Data Transmission
The converter provides reliable signal conversion between connected serial devices, maintaining accurate data transmission without degradation. This stable operation is essential for industrial control and monitoring environments where data integrity is critical.
- Reliable conversion across all three supported standards
- Maintains signal accuracy between connected equipment
- Designed for continuous industrial operation
Installation
Direct connection or multi-device bus
The LD2535U supports two primary installation configurations depending on the target communication standard. RS232 and RS422 are used for point-to-point connections, while RS485 supports multi-device network installations.
01
RS232 and RS422 Point-to-Point
For RS232 or RS422 output, the LD2535U is installed between the RS232 source device and the target serial equipment. The RS232 port of the source connects to the converter input. The output side connects to the target device using the appropriate RS232 or RS422 wiring. The 5V adaptor is connected to power the unit. This configuration is suited for direct device-to-device communication in industrial controllers, instrumentation systems, and process monitoring equipment.
02
RS485 Multi-Device Bus
When RS485 output is required, the LD2535U is installed between the RS232 source and the RS485 network bus. Multiple field devices can be connected along the same bus, allowing a single computer or controller to communicate with all devices in the RS485 network. This configuration is commonly used in building management systems, industrial automation networks, and distributed monitoring installations where multiple field devices must share a single communication line.
Where the LD2535U performs
Designed for environments where legacy serial devices must communicate reliably with modern industrial networks and multi-device communication systems.
Industrial Automation and Process Control
Connect RS232-based controllers and computers to RS485 field devices within automation and process control systems. The converter enables a single controller to communicate with multiple instruments on a shared bus.
Building Management Systems
Integrate RS232 control equipment with RS485 networks used in building management and facility automation. Allows multiple building subsystems such as HVAC, lighting, and access control to be managed from a common RS232 controller.
Data Acquisition and Instrumentation
Interface data loggers, sensors, and instrumentation equipment operating on different serial standards. The LD2535U ensures accurate data collection from field instruments connected over RS422 or RS485 to an RS232 data acquisition system.
Serial Communication Interface Conversion
Enable legacy RS232 devices to connect directly with modern RS422 or RS485 infrastructure. The converter eliminates the need to replace or modify existing serial equipment when upgrading communication networks.
Remote Monitoring and Industrial Networks
Deploy across distributed industrial monitoring installations where RS485 long-distance, multi-drop communication is required. The converter allows a central RS232 host to poll and receive data from multiple remote field devices.
Communication Racks and Control Panels
Install within structured communication racks, control cabinets, and panel enclosures where compact serial conversion is required. The 5V adaptor power supply suits the stable, low-voltage power environments typical of such installations.
Full specification sheet
- Communication Standards
- Signal Characteristics
- Power Supply
- Installation and Environment
FAQs about the LD2535U
What does the LD2535U RS232 to RS232 / RS422 / RS485 converter do?
The LD2535U converter allows devices using RS232 to communicate with RS232, RS422, or RS485 systems. It accepts RS232 input signals from computers, controllers, or data loggers, and converts them to the selected output standard. This enables connection between different serial devices without requiring major changes to the existing setup.
Why is it useful to have support for RS232, RS422, and RS485 in one device?
Having all three communication options in one converter makes it easier to work with different types of equipment. It provides flexibility when integrating older RS232 devices with modern industrial networks that operate on RS422 or RS485 standards, removing the need for multiple separate converter units.
Is the LD2535U suitable for long-distance communication?
Yes. When used with RS422 or RS485 output, the converter supports longer communication distances and better noise resistance compared to standard RS232 connections. RS422 uses differential signaling with +TX, -TX, +RX, and -RX pairs to reduce the effects of electrical interference, making it suitable for extended cable runs in industrial environments.
What type of power supply does this converter require?
The LD2535U uses a 5V adaptor, making it energy-efficient and easy to install in most setups. The low-voltage power requirement makes it suitable for use in communication racks, control panels, and industrial environments where compact and stable power sources are available.
Where is the LD2535U converter commonly used?
It is commonly used in industrial automation, monitoring systems, data communication setups, and building management systems where different serial devices need to work together. Typical installations include process control panels, communication racks, data acquisition systems, and distributed field monitoring networks.
Can the LD2535U connect multiple devices simultaneously using RS485?
Yes. When configured for RS485 output, the LD2535U enables multiple field devices to share a single RS485 communication bus. This allows a single RS232 computer or controller to communicate with several RS485 devices connected along the same bus, which is a common requirement in building management and industrial automation networks.
What source devices are compatible with the LD2535U?
The LD2535U is compatible with any equipment that uses a standard RS232 communication interface. This includes computers, industrial controllers, data loggers, instrumentation systems, and computer-based monitoring equipment. Any device that outputs RS232 signals via TX, RX, and GND can be used as the input source for this converter.
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