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- Reverse Port Sharing Functionality:
Enables three RS485 master devices to communicate with one RS485 slave through intelligent data management and buffering.
- Stored-and-Forward Communication:
Incorporates a store-and-forward interactive handshake mechanism that ensures one master is serviced at a time, preventing data collision and maintaining communication integrity.
- Multi-Master MODBUS Support:
Designed to allow multiple MODBUS master controllers to access a single slave device seamlessly, simulating independent access for each master.
- Automatic Data Direction Control:
Supports Auto-Data-Direction-Control for RS485 communication, simplifying configuration and ensuring proper half-duplex operation.
- Electrical Isolation:
All RS485 ports are ground-isolated, providing protection against ground loops and electrical noise in industrial environments.
- Flexible Interface Configuration:
DIP switch selectable RS422/RS485 interface modes, allowing adaptation to different serial communication standards.
- Compact and Durable Design:
Housed in a 90 mm (W) × 150 mm (L) × 27 mm (H) enclosure, suitable for desktop or panel mounting.
- LED Status Indicators:
Dedicated LEDs for power and data activity on each port (A, B, C, D) provide real-time operational feedback.
- Low Power Consumption:
Operates at 5 VDC, 400 mA, with a universal AC adapter input range of 100–240 VAC.
- Industrial-Grade Environmental Tolerance:
Designed for operation in 0°C to 55°C and humidity levels up to 95% RH, suitable for factory and automation control systems.
Enables three RS485 master devices to communicate with one RS485 slave through intelligent data management and buffering.
- Stored-and-Forward Communication:
Incorporates a store-and-forward interactive handshake mechanism that ensures one master is serviced at a time, preventing data collision and maintaining communication integrity.
- Multi-Master MODBUS Support:
Designed to allow multiple MODBUS master controllers to access a single slave device seamlessly, simulating independent access for each master.
- Automatic Data Direction Control:
Supports Auto-Data-Direction-Control for RS485 communication, simplifying configuration and ensuring proper half-duplex operation.
- Electrical Isolation:
All RS485 ports are ground-isolated, providing protection against ground loops and electrical noise in industrial environments.
- Flexible Interface Configuration:
DIP switch selectable RS422/RS485 interface modes, allowing adaptation to different serial communication standards.
- Compact and Durable Design:
Housed in a 90 mm (W) × 150 mm (L) × 27 mm (H) enclosure, suitable for desktop or panel mounting.
- LED Status Indicators:
Dedicated LEDs for power and data activity on each port (A, B, C, D) provide real-time operational feedback.
- Low Power Consumption:
Operates at 5 VDC, 400 mA, with a universal AC adapter input range of 100–240 VAC.
- Industrial-Grade Environmental Tolerance:
Designed for operation in 0°C to 55°C and humidity levels up to 95% RH, suitable for factory and automation control systems.
Comprehensive Product Summary – IS004S Reverse Port Sharer (RS485 3-Master to 1-Slave)
### 1. Product Overview
Product Name: Reverse Port Sharer RS485 3*Master to 1*RS485 Slave
Model: IS004S
Series: S400 Series (IS400/IS004S Family)
Article Number: IS004S
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
- Web: [www.rayontech.com](http://www.rayontech.com) / [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)
Product Description:
The IS004S Reverse Port Sharer is a specialized serial communication device designed to allow three RS485 master devices to share access to a single RS485 slave device. It belongs to Rayon’s S400 Series of serial port sharers, which are engineered for flexible, isolated, and reliable multi-port serial communication management. The IS004S model specifically supports RS485 communication with ground isolation on all ports, ensuring robust performance in industrial and automation environments where multiple MODBUS masters need to communicate with a single slave without data collision or interference.
### 2. Key Features
- Reverse Port Sharing Functionality:
Enables three RS485 master devices to communicate with one RS485 slave through intelligent data management and buffering.
- Stored-and-Forward Communication:
Incorporates a store-and-forward interactive handshake mechanism that ensures one master is serviced at a time, preventing data collision and maintaining communication integrity.
- Multi-Master MODBUS Support:
Designed to allow multiple MODBUS master controllers to access a single slave device seamlessly, simulating independent access for each master.
- Automatic Data Direction Control:
Supports Auto-Data-Direction-Control for RS485 communication, simplifying configuration and ensuring proper half-duplex operation.
- Electrical Isolation:
All RS485 ports are ground-isolated, providing protection against ground loops and electrical noise in industrial environments.
- Flexible Interface Configuration:
DIP switch selectable RS422/RS485 interface modes, allowing adaptation to different serial communication standards.
- Compact and Durable Design:
Housed in a 90 mm (W) × 150 mm (L) × 27 mm (H) enclosure, suitable for desktop or panel mounting.
- LED Status Indicators:
Dedicated LEDs for power and data activity on each port (A, B, C, D) provide real-time operational feedback.
- Low Power Consumption:
Operates at 5 VDC, 400 mA, with a universal AC adapter input range of 100–240 VAC.
- Industrial-Grade Environmental Tolerance:
Designed for operation in 0°C to 55°C and humidity levels up to 95% RH, suitable for factory and automation control systems.
### 3. Technical Specifications
Electrical & Interface Specifications:
- Interface Type: RS485 (with isolation)
- Number of Ports: 4 total (3 master ports + 1 slave port)
- Connector Type: DB9 male connectors (4 total)
- Signal Pins: 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−
Power Requirements:
- Input Voltage: 5 VDC
- Current Consumption: 400 mA @ 5 VDC
- Power Adapter: UP110/UP220 (US/EU type)
- Input: 100–240 VAC
- Output: 5 VDC, 1000 mA
Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Weight: Approx. 250–300 g (typical for S400 series aluminum enclosure)
- Material: Industrial-grade metal housing (Rayon standard S400 enclosure)
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
### 4. Functionality
Operational Concept:
The IS004S Reverse Port Sharer acts as a communication arbitrator between multiple RS485 master devices and a single RS485 slave. In standard MODBUS or serial communication networks, multiple masters attempting to access a single slave simultaneously can cause data collisions and communication errors. The IS004S resolves this by implementing a stored-and-forward mechanism that queues and manages communication requests.
How It Works:
1. When one master initiates communication with the slave, the IS004S establishes a temporary exclusive link between that master and the slave.
2. Incoming data from the active master is transmitted to the slave, and responses from the slave are routed back to the same master.
3. If another master attempts to communicate during this session, its request is buffered until the current transaction completes.
4. Once the first master’s session ends, the next master’s request is processed in sequence.
This ensures that each master experiences a dedicated communication session with the slave, effectively simulating independent access without interference.
Use Cases & Applications:
- Industrial Automation: Multiple PLCs or controllers accessing a shared sensor or actuator.
- MODBUS Networks: Multi-master MODBUS RTU systems requiring controlled access to a single slave device.
- Data Acquisition Systems: Centralized data logging from multiple supervisory systems.
- Building Management Systems (BMS): Multiple control panels communicating with a shared RS485-based HVAC or lighting controller.
- Testing and Calibration: Multiple test stations accessing a single measurement instrument.
Compatibility:
- Fully compatible with RS485 and MODBUS RTU communication protocols.
- Can be integrated with existing RS485 networks using standard DB9 connectors.
- Supports both 2-wire half-duplex and 4-wire full-duplex configurations (via DIP switch).
### 5. Components & Accessories
Included Items:
- IS004S Reverse Port Sharer main unit
- UP110/UP220 universal AC power adapter (100–240 VAC input, 5 VDC 1A output)
- User manual and configuration guide
Optional Accessories:
- RS485/RS422 communication cables (DB9 male-to-female)
- DIN-rail mounting kit (optional for industrial installations)
- USB-to-RS485 converter for PC configuration or diagnostics
Connectors:
- Port A: RS485 Master 1
- Port B: RS485 Master 2
- Port C: RS485 Master 3
- Port D: RS485 Slave
All ports use DB9 male connectors with isolated ground reference.
### 6. Installation & Setup
Requirements:
- Power supply: 5 VDC, 400 mA minimum
- Communication cables: Standard RS485 twisted-pair shielded cables
- Proper grounding and isolation for industrial environments
Mounting Options:
- Desktop placement (default)
- Optional DIN-rail or wall mounting using accessory brackets
Configuration:
- Interface Selection: RS422/RS485 mode selectable via DIP switch
- Wiring:
- RS485: Connect DATA+ (TX+/RX+) and DATA− (TX−/RX−) lines
- Ensure proper termination resistors at network ends if required
- LED Indicators: Verify power and data activity through front-panel LEDs
Setup Procedure:
1. Connect the three master devices to ports A, B, and C.
2. Connect the slave device to port D.
3. Apply power using the supplied adapter.
4. Configure DIP switches for RS485 mode.
5. Verify communication using MODBUS or serial terminal software.
### 7. Performance & Capabilities
Communication Performance:
- Baud Rate: Supports standard RS485 data rates (up to 115.2 kbps typical, depending on cable length and environment)
- Data Integrity: Store-and-forward buffering ensures no data loss during master switching
- Latency: Minimal delay introduced by internal buffering (typically <10 ms per transaction)
- Isolation Voltage: Ground isolation between ports prevents cross-interference
Capacity:
- Supports up to three simultaneous master connections (queued sequentially)
- One slave device connection
Efficiency:
- Intelligent arbitration ensures maximum bus utilization without collisions
- Auto-direction control eliminates need for manual RTS signal management
Limitations:
- Only one master can actively communicate with the slave at any given time
- Not suitable for applications requiring simultaneous multi-master real-time access
### 8. Standards & Compliance
Electrical & Safety Compliance:
- Designed to meet CE and FCC Class A electromagnetic compatibility standards (typical for Rayon S400 series)
- Complies with RoHS environmental directives (lead-free construction)
Industry Standards Supported:
- EIA/TIA-485-A (RS485)
- EIA/TIA-422-B (RS422)
- MODBUS RTU protocol compatibility
Isolation & Protection:
- Ground isolation on all serial ports
- Protection against transient voltage and ground potential differences
### 9. Additional Information
Warranty:
- Standard 1-year limited warranty covering manufacturing defects and hardware failures under normal operating conditions.
Technical Support:
- Provided directly by Rayon Technology Co., Ltd. via email or phone.
- Firmware updates and configuration assistance available upon request.
Maintenance:
- No periodic maintenance required beyond ensuring clean connectors and stable power supply.
- Recommended to periodically verify cable integrity and grounding.
Firmware & Updates:
- The IS004S operates with embedded firmware optimized for MODBUS and RS485 communication.
- Updates, if available, can be applied through authorized service channels.
Product Family Context:
The IS004S is part of Rayon’s S400 Series Serial Port Sharers, which includes multiple models for different interface combinations:
- S232 / S232o / S232io: RS232 master to 3 RS232 slave configurations
- S432i / S432io: RS422/485 master to RS232 slave configurations
- S434io: RS422/485 master to RS422/485 slave configurations
- S234o / S234io: RS232 master to RS422/485 slave configurations
- IS004S: Reverse configuration – 3 RS485 masters to 1 RS485 slave
Each model shares the same physical design and power characteristics, differing only in interface type and isolation features.
### Summary
The Rayon IS004S Reverse Port Sharer is a robust, industrial-grade communication management device engineered to solve the challenge of multi-master access in RS485 networks. By implementing intelligent store-and-forward logic, it allows up to three MODBUS or RS485 master devices to communicate with a single slave device safely and efficiently. Its isolated design, flexible configuration, and compact form factor make it ideal for automation, control, and monitoring systems where reliability and data integrity are critical.
With its combination of electrical isolation, auto-direction control, and multi-master arbitration, the IS004S provides a dependable solution for complex serial communication topologies, ensuring seamless integration into existing RS485 infrastructures while maintaining compliance with industry standards and environmental requirements.
### 1. Product Overview
Product Name: Reverse Port Sharer RS485 3*Master to 1*RS485 Slave
Model: IS004S
Series: S400 Series (IS400/IS004S Family)
Article Number: IS004S
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
- Web: [www.rayontech.com](http://www.rayontech.com) / [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)
Product Description:
The IS004S Reverse Port Sharer is a specialized serial communication device designed to allow three RS485 master devices to share access to a single RS485 slave device. It belongs to Rayon’s S400 Series of serial port sharers, which are engineered for flexible, isolated, and reliable multi-port serial communication management. The IS004S model specifically supports RS485 communication with ground isolation on all ports, ensuring robust performance in industrial and automation environments where multiple MODBUS masters need to communicate with a single slave without data collision or interference.
### 2. Key Features
- Reverse Port Sharing Functionality:
Enables three RS485 master devices to communicate with one RS485 slave through intelligent data management and buffering.
- Stored-and-Forward Communication:
Incorporates a store-and-forward interactive handshake mechanism that ensures one master is serviced at a time, preventing data collision and maintaining communication integrity.
- Multi-Master MODBUS Support:
Designed to allow multiple MODBUS master controllers to access a single slave device seamlessly, simulating independent access for each master.
- Automatic Data Direction Control:
Supports Auto-Data-Direction-Control for RS485 communication, simplifying configuration and ensuring proper half-duplex operation.
- Electrical Isolation:
All RS485 ports are ground-isolated, providing protection against ground loops and electrical noise in industrial environments.
- Flexible Interface Configuration:
DIP switch selectable RS422/RS485 interface modes, allowing adaptation to different serial communication standards.
- Compact and Durable Design:
Housed in a 90 mm (W) × 150 mm (L) × 27 mm (H) enclosure, suitable for desktop or panel mounting.
- LED Status Indicators:
Dedicated LEDs for power and data activity on each port (A, B, C, D) provide real-time operational feedback.
- Low Power Consumption:
Operates at 5 VDC, 400 mA, with a universal AC adapter input range of 100–240 VAC.
- Industrial-Grade Environmental Tolerance:
Designed for operation in 0°C to 55°C and humidity levels up to 95% RH, suitable for factory and automation control systems.
### 3. Technical Specifications
Electrical & Interface Specifications:
- Interface Type: RS485 (with isolation)
- Number of Ports: 4 total (3 master ports + 1 slave port)
- Connector Type: DB9 male connectors (4 total)
- Signal Pins: 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−
Power Requirements:
- Input Voltage: 5 VDC
- Current Consumption: 400 mA @ 5 VDC
- Power Adapter: UP110/UP220 (US/EU type)
- Input: 100–240 VAC
- Output: 5 VDC, 1000 mA
Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Weight: Approx. 250–300 g (typical for S400 series aluminum enclosure)
- Material: Industrial-grade metal housing (Rayon standard S400 enclosure)
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
### 4. Functionality
Operational Concept:
The IS004S Reverse Port Sharer acts as a communication arbitrator between multiple RS485 master devices and a single RS485 slave. In standard MODBUS or serial communication networks, multiple masters attempting to access a single slave simultaneously can cause data collisions and communication errors. The IS004S resolves this by implementing a stored-and-forward mechanism that queues and manages communication requests.
How It Works:
1. When one master initiates communication with the slave, the IS004S establishes a temporary exclusive link between that master and the slave.
2. Incoming data from the active master is transmitted to the slave, and responses from the slave are routed back to the same master.
3. If another master attempts to communicate during this session, its request is buffered until the current transaction completes.
4. Once the first master’s session ends, the next master’s request is processed in sequence.
This ensures that each master experiences a dedicated communication session with the slave, effectively simulating independent access without interference.
Use Cases & Applications:
- Industrial Automation: Multiple PLCs or controllers accessing a shared sensor or actuator.
- MODBUS Networks: Multi-master MODBUS RTU systems requiring controlled access to a single slave device.
- Data Acquisition Systems: Centralized data logging from multiple supervisory systems.
- Building Management Systems (BMS): Multiple control panels communicating with a shared RS485-based HVAC or lighting controller.
- Testing and Calibration: Multiple test stations accessing a single measurement instrument.
Compatibility:
- Fully compatible with RS485 and MODBUS RTU communication protocols.
- Can be integrated with existing RS485 networks using standard DB9 connectors.
- Supports both 2-wire half-duplex and 4-wire full-duplex configurations (via DIP switch).
### 5. Components & Accessories
Included Items:
- IS004S Reverse Port Sharer main unit
- UP110/UP220 universal AC power adapter (100–240 VAC input, 5 VDC 1A output)
- User manual and configuration guide
Optional Accessories:
- RS485/RS422 communication cables (DB9 male-to-female)
- DIN-rail mounting kit (optional for industrial installations)
- USB-to-RS485 converter for PC configuration or diagnostics
Connectors:
- Port A: RS485 Master 1
- Port B: RS485 Master 2
- Port C: RS485 Master 3
- Port D: RS485 Slave
All ports use DB9 male connectors with isolated ground reference.
### 6. Installation & Setup
Requirements:
- Power supply: 5 VDC, 400 mA minimum
- Communication cables: Standard RS485 twisted-pair shielded cables
- Proper grounding and isolation for industrial environments
Mounting Options:
- Desktop placement (default)
- Optional DIN-rail or wall mounting using accessory brackets
Configuration:
- Interface Selection: RS422/RS485 mode selectable via DIP switch
- Wiring:
- RS485: Connect DATA+ (TX+/RX+) and DATA− (TX−/RX−) lines
- Ensure proper termination resistors at network ends if required
- LED Indicators: Verify power and data activity through front-panel LEDs
Setup Procedure:
1. Connect the three master devices to ports A, B, and C.
2. Connect the slave device to port D.
3. Apply power using the supplied adapter.
4. Configure DIP switches for RS485 mode.
5. Verify communication using MODBUS or serial terminal software.
### 7. Performance & Capabilities
Communication Performance:
- Baud Rate: Supports standard RS485 data rates (up to 115.2 kbps typical, depending on cable length and environment)
- Data Integrity: Store-and-forward buffering ensures no data loss during master switching
- Latency: Minimal delay introduced by internal buffering (typically <10 ms per transaction)
- Isolation Voltage: Ground isolation between ports prevents cross-interference
Capacity:
- Supports up to three simultaneous master connections (queued sequentially)
- One slave device connection
Efficiency:
- Intelligent arbitration ensures maximum bus utilization without collisions
- Auto-direction control eliminates need for manual RTS signal management
Limitations:
- Only one master can actively communicate with the slave at any given time
- Not suitable for applications requiring simultaneous multi-master real-time access
### 8. Standards & Compliance
Electrical & Safety Compliance:
- Designed to meet CE and FCC Class A electromagnetic compatibility standards (typical for Rayon S400 series)
- Complies with RoHS environmental directives (lead-free construction)
Industry Standards Supported:
- EIA/TIA-485-A (RS485)
- EIA/TIA-422-B (RS422)
- MODBUS RTU protocol compatibility
Isolation & Protection:
- Ground isolation on all serial ports
- Protection against transient voltage and ground potential differences
### 9. Additional Information
Warranty:
- Standard 1-year limited warranty covering manufacturing defects and hardware failures under normal operating conditions.
Technical Support:
- Provided directly by Rayon Technology Co., Ltd. via email or phone.
- Firmware updates and configuration assistance available upon request.
Maintenance:
- No periodic maintenance required beyond ensuring clean connectors and stable power supply.
- Recommended to periodically verify cable integrity and grounding.
Firmware & Updates:
- The IS004S operates with embedded firmware optimized for MODBUS and RS485 communication.
- Updates, if available, can be applied through authorized service channels.
Product Family Context:
The IS004S is part of Rayon’s S400 Series Serial Port Sharers, which includes multiple models for different interface combinations:
- S232 / S232o / S232io: RS232 master to 3 RS232 slave configurations
- S432i / S432io: RS422/485 master to RS232 slave configurations
- S434io: RS422/485 master to RS422/485 slave configurations
- S234o / S234io: RS232 master to RS422/485 slave configurations
- IS004S: Reverse configuration – 3 RS485 masters to 1 RS485 slave
Each model shares the same physical design and power characteristics, differing only in interface type and isolation features.
### Summary
The Rayon IS004S Reverse Port Sharer is a robust, industrial-grade communication management device engineered to solve the challenge of multi-master access in RS485 networks. By implementing intelligent store-and-forward logic, it allows up to three MODBUS or RS485 master devices to communicate with a single slave device safely and efficiently. Its isolated design, flexible configuration, and compact form factor make it ideal for automation, control, and monitoring systems where reliability and data integrity are critical.
With its combination of electrical isolation, auto-direction control, and multi-master arbitration, the IS004S provides a dependable solution for complex serial communication topologies, ensuring seamless integration into existing RS485 infrastructures while maintaining compliance with industry standards and environmental requirements.
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S400_Catalog.pdf
PDF Catalog
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S232 Application Note.pdf
Manual
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2017Computex6_en IS004S.pdf
Manual
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