Comprehensive Product Summary – Rayon S234o Port Sharer (S400 Series)

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### 1. Product Overview

Product Name: Port Sharer RS232 Master to Isolated 3×RS485/422 Slaves
Model: S234o
Series: S400 Series – Serial Port Sharer Family
Article Number: S234o
Manufacturer: Rayon Technology Co., Ltd.
Manufacturer Address: 2F, No. 177, Chung Shan 2 Rd., Lu Chou City, Taipei Hsien, Taiwan
Contact:
- Tel: +886-2-82858362
- Fax: +886-2-82857065
- Email: rayon@ms1.hinet.net
- Websites: [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon), [www.rayontech.com](http://www.rayontech.com)

The Rayon S234o is a professional-grade serial communication port-sharing device designed to connect one RS232 master port to three isolated RS485/422 slave ports. It belongs to Rayon’s S400 Series, a family of flexible and robust serial port sharers engineered for industrial, laboratory, and automation environments requiring reliable multi-port serial communication with electrical isolation and configurable interface types.

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### 2. Key Features

- One-to-Three Port Sharing: Enables a single RS232 master device to communicate with up to three isolated RS485/422 slave devices simultaneously.
- Electrical Isolation: Each slave port is galvanically isolated, providing enhanced protection against ground loops, surges, and electrical noise.
- Multi-Protocol Support: Supports both RS485 and RS422 communication standards, selectable via DIP switch configuration.
- Auto Data Direction Control: Built-in automatic data direction control for RS485 mode eliminates the need for manual RTS signal handling, simplifying integration.
- Flexible Interface Configuration: The S400 series architecture allows various combinations of master and slave interface types (RS232, RS422/485, isolated variants).
- Compact Industrial Design: Rugged metal enclosure with compact dimensions (90 × 150 × 27 mm) suitable for panel or desktop installation.
- LED Status Indicators: Dedicated LEDs for power and data activity on each port (PWR, ATRX, BTRX, CTRX, DTRX) provide real-time operational feedback.
- Low Power Consumption: Operates efficiently at 400 mA @ 5 VDC, minimizing power requirements in embedded or distributed systems.
- Universal Power Adapter: Compatible with 100–240 VAC input via UP110/UP220 adapters, providing 5 VDC regulated output.
- High Reliability: Designed for continuous operation in industrial temperature and humidity ranges, ensuring stable performance in demanding environments.

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### 3. Technical Specifications

Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Weight: Not specified (approx. < 500 g typical for S400 series)
- Enclosure Material: Industrial-grade metal housing for EMI shielding and mechanical durability
- Color/Finish: Standard Rayon S400 series finish (metallic gray or anodized aluminum)

Electrical Characteristics:
- Power Input: 5 VDC ±5%
- Power Consumption: 400 mA @ 5 VDC
- Power Adapter: UP110/UP220 (US/EU type)
- Input: 100–240 VAC, 50/60 Hz
- Output: 5 VDC, 1000 mA

Serial Interface:
- Connector Type: DB9 male connectors (4 total: ports A, B, C, D)
- Number of Ports: 4 total (1 master + 3 slave)
- Master Port Interface: RS232
- Slave Port Interfaces: Isolated RS485/422 (3 ports)
- Isolation: Optical/electrical isolation between master and slave ports
- Signal Pins (per port): TX+, TX−, RX+, RX−, Isolated GND
- RS485 Mode: Auto Data Direction Control supported
- TX+ and RX+ shorted as DATA+
- TX− and RX− shorted as DATA−

Environmental Conditions:
- Operating Temperature: 0°C to 55°C
- Storage Temperature: 0°C to 65°C
- Operating Humidity: 10% to 95% RH (non-condensing)
- Storage Humidity: 5% to 95% RH (non-condensing)

Indicators:
- PWR: Power ON indicator
- ATRX: Port A TXD/RXD activity
- BTRX: Port B TXD/RXD activity
- CTRX: Port C TXD/RXD activity
- DTRX: Port D TXD/RXD activity

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### 4. Functionality

The S234o Port Sharer functions as a communication hub that allows a single RS232 master device—such as a computer, PLC, or controller—to interface with three isolated RS485/422 slave devices. The device translates and distributes serial data between the master and slave ports while maintaining electrical isolation to prevent interference and protect connected equipment.

Operational Principle:
- The RS232 master port (Port A) receives and transmits serial data using standard RS232 signaling.
- The internal circuitry converts RS232 signals to RS485/422 differential signals for each of the three slave ports (Ports B, C, D).
- Each slave port operates independently and is isolated from the others, ensuring that faults or noise on one line do not affect the others.
- In RS485 mode, the Auto Data Direction Control feature automatically manages the transmit/receive switching, simplifying communication with half-duplex devices.
- DIP switches allow users to select between RS422 (full-duplex) and RS485 (half-duplex) operation for each slave port.

Typical Use Cases:
- Industrial automation systems requiring one controller to communicate with multiple field devices.
- Data acquisition systems where a central PC or PLC polls multiple sensors or actuators.
- Laboratory instrumentation setups needing isolated communication channels.
- Building management systems (BMS) or SCADA networks using RS485/422 field buses.
- Serial device networking in environments with high electrical noise or potential ground loops.

Compatibility:
- Compatible with standard RS232, RS422, and RS485 devices.
- Works with PCs, PLCs, HMIs, embedded controllers, and industrial communication modules.
- Supports standard serial communication protocols (Modbus RTU, ASCII, proprietary serial protocols).

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### 5. Components & Accessories

Included Items:
- S234o Port Sharer main unit
- UP110 or UP220 power adapter (region-specific)
- User manual or quick start guide
- Mounting hardware (optional, depending on package)

Connectors:
- 4 × DB9 male connectors (Ports A–D)
- Power input jack (5 VDC)

Optional Accessories:
- DB9-to-terminal block adapters for field wiring
- RS232/RS485/RS422 cables
- DIN-rail mounting kit (if required for industrial panels)
- Extended power supply options for redundant or centralized power systems

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### 6. Installation & Setup

Requirements:
- Power source: 5 VDC regulated supply (included adapter recommended)
- Host device with RS232 interface (master)
- Up to three RS485/422 slave devices

Mounting Options:
- Desktop or panel mounting (standard)
- Optional DIN-rail mounting for industrial enclosures

Configuration Steps:
1. Power Connection: Connect the supplied 5 VDC adapter to the power input jack. Verify the PWR LED is illuminated.
2. Master Port Connection: Connect the RS232 master device to Port A (DB9 male).
3. Slave Port Connections: Connect up to three RS485/422 devices to Ports B, C, and D using appropriate cabling.
4. Interface Selection: Use the DIP switch to configure each slave port for RS422 or RS485 mode as required.
5. Signal Wiring:
- For RS422: Connect TX+/TX− and RX+/RX− lines separately.
- For RS485: Short TX+ to RX+ (DATA+) and TX− to RX− (DATA−).
6. Verification: Observe the ATRX, BTRX, CTRX, and DTRX LEDs for data activity confirmation.

Safety Notes:
- Ensure all devices share a common reference ground if isolation is not used.
- Avoid hot-plugging serial connections under power to prevent transient damage.
- Maintain proper cable shielding and grounding for long-distance RS485/422 runs.

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### 7. Performance & Capabilities

Communication Performance:
- Supports standard asynchronous serial communication rates (typically up to 115.2 kbps or higher depending on cable length and environment).
- Full-duplex operation in RS422 mode; half-duplex in RS485 mode.
- Auto-direction control ensures efficient data flow without manual RTS management.

Capacity:
- One master port (RS232)
- Three isolated slave ports (RS485/422)
- Total of four independent communication channels

Efficiency:
- Low power draw (400 mA @ 5 VDC) allows integration into low-power systems.
- Isolation minimizes data errors due to ground potential differences.
- Compact design optimizes space utilization in control panels or test benches.

Limitations:
- Does not support simultaneous multi-master operation (single master only).
- RS485/422 cable length and baud rate must adhere to standard transmission limits (typically up to 1200 m at 9600 bps).
- No built-in surge protection beyond isolation; external surge suppressors recommended for harsh environments.

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### 8. Standards & Compliance

Electrical & Interface Standards:
- RS232 (EIA/TIA-232)
- RS422 (EIA/TIA-422)
- RS485 (EIA/TIA-485)

Safety & Environmental Compliance:
- Designed for industrial temperature and humidity ranges.
- Meets general CE and FCC electromagnetic compatibility requirements (typical for Rayon industrial products).
- Isolation design conforms to standard industrial isolation practices for serial communication equipment.

Quality Assurance:
- Manufactured under Rayon Technology’s quality management system.
- Each unit tested for electrical isolation, signal integrity, and functional performance.

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year, subject to Rayon’s policy).
- Covers defects in materials and workmanship under normal operating conditions.

Technical Support:
- Provided directly by Rayon Technology Co., Ltd. via email or phone.
- Documentation, firmware updates, and configuration guides available on the manufacturer’s website.

Maintenance:
- Minimal maintenance required; periodic inspection of connectors and cables recommended.
- Keep ventilation openings clear and avoid exposure to excessive dust or moisture.
- Clean with a dry, lint-free cloth; avoid solvents or abrasive materials.

Firmware/Software Updates:
- The S234o operates as a hardware-level serial converter and typically does not require firmware updates.
- Configuration is hardware-based via DIP switches, ensuring long-term stability and compatibility.

Product Family Context:
The S234o is part of Rayon’s S400 Series Serial Port Sharer lineup, which includes multiple models with varying interface combinations:
- S232: RS232 master to 3 RS232 slaves
- S232o: RS232 master to 3 isolated RS232 slaves
- S232io: Isolated RS232 master to 3 isolated RS232 slaves
- S432i: Isolated RS422/485 master to 3 RS232 slaves
- S432io: Isolated RS422/485 master to 3 isolated RS232 slaves
- S434io: Isolated RS422/485 master to 3 isolated RS422/485 slaves
- S234o: RS232 master to 3 isolated RS422/485 slaves (this model)
- S234io: Isolated RS232 master to 3 isolated RS422/485 slaves

This modular approach allows system designers to select the exact combination of master and slave interfaces required for their application, ensuring maximum flexibility and interoperability across diverse serial communication environments.

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### Summary

The Rayon S234o Port Sharer is a compact, industrial-grade serial communication device that bridges one RS232 master port to three isolated RS485/422 slave ports. Engineered for reliability, electrical isolation, and flexible configuration, it is ideal for industrial automation, instrumentation, and control systems requiring robust multi-port serial connectivity. With its combination of isolation, auto-direction control, and compact design, the S234o delivers dependable performance in environments where signal integrity and equipment protection are critical.

Manufacturer: Rayon Technology Co., Ltd.
Model: S234o
Series: S400 Serial Port Sharer
Function: RS232 master to 3 isolated RS485/422 slave ports
Power: 5 VDC, 400 mA
Dimensions: 90 × 150 × 27 mm
Connectors: 4 × DB9 male
Isolation: Yes (slave ports)
Operating Range: 0–55°C, 10–95% RH
Applications: Industrial automation, data acquisition, SCADA, laboratory instrumentation, and serial device networking.

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End of Product Summary – Rayon S234o Port Sharer (S400 Series)