LOOKING FOR THE RIGHT
INDUSTRIAL SOLUTION?
Discover embedded, communication and automation solutions tailored to your application.
- Reverse Port Sharing Functionality:
Enables up to three RS232 master devices to access one RS232 slave device through controlled, sequential communication.
- Multi-Master to Single-Slave Communication:
Designed for environments where multiple MODBUS or RS232 master hosts need to access a single slave device without conflict.
- Store-and-Forward Data Handling:
Incorporates an internal buffer and handshake logic to queue and forward data, ensuring that only one master communicates with the slave at a time.
- Automatic Arbitration:
Built-in logic prioritizes master requests, servicing one master at a time while queuing others, effectively simulating independent access.
- RS232 Interface Support:
Fully compliant with RS232 electrical standards, using DB9 male connectors for all ports.
- LED Status Indicators:
Four independent LED indicators (PWR, ATRX, BTRX, CTRX, DTRX) provide real-time visual feedback for power and data transmission activity on each port.
- Compact Industrial Design:
Ruggedized enclosure measuring 90 mm × 150 mm × 27 mm, suitable for control cabinets or desktop integration.
- Low Power Consumption:
Operates at 5 VDC with a typical current draw of 400 mA, powered via an external AC adapter.
- Flexible Configuration:
DIP switch settings allow selection between RS422 and RS485 modes in other S400 variants; IS400S specifically supports RS232.
- High Compatibility:
Works seamlessly with standard RS232 devices such as PLCs, meters, sensors, printers, and industrial controllers.
- Isolation Options (Series Dependent):
Other S400 models offer galvanic isolation on master and/or slave ports for enhanced noise immunity and protection.
Enables up to three RS232 master devices to access one RS232 slave device through controlled, sequential communication.
- Multi-Master to Single-Slave Communication:
Designed for environments where multiple MODBUS or RS232 master hosts need to access a single slave device without conflict.
- Store-and-Forward Data Handling:
Incorporates an internal buffer and handshake logic to queue and forward data, ensuring that only one master communicates with the slave at a time.
- Automatic Arbitration:
Built-in logic prioritizes master requests, servicing one master at a time while queuing others, effectively simulating independent access.
- RS232 Interface Support:
Fully compliant with RS232 electrical standards, using DB9 male connectors for all ports.
- LED Status Indicators:
Four independent LED indicators (PWR, ATRX, BTRX, CTRX, DTRX) provide real-time visual feedback for power and data transmission activity on each port.
- Compact Industrial Design:
Ruggedized enclosure measuring 90 mm × 150 mm × 27 mm, suitable for control cabinets or desktop integration.
- Low Power Consumption:
Operates at 5 VDC with a typical current draw of 400 mA, powered via an external AC adapter.
- Flexible Configuration:
DIP switch settings allow selection between RS422 and RS485 modes in other S400 variants; IS400S specifically supports RS232.
- High Compatibility:
Works seamlessly with standard RS232 devices such as PLCs, meters, sensors, printers, and industrial controllers.
- Isolation Options (Series Dependent):
Other S400 models offer galvanic isolation on master and/or slave ports for enhanced noise immunity and protection.
Comprehensive Product Summary – IS400S Reverse Port Sharer RS232 (S400 Series)
### 1. Product Overview
Product Name: IS400S Reverse Port Sharer
Model: IS400S
Series: S400 Series (Serial Port Sharer Family)
Article Number: IS400S
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.rayontech.com](http://www.rayontech.com), [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)
Product Description:
The IS400S is a reverse serial port sharer designed to allow multiple RS232 master devices to communicate with a single RS232 slave device. It belongs to Rayon’s S400 Series of serial communication management devices, engineered for industrial and automation environments where multiple controllers or hosts need to share access to a single serial peripheral. The IS400S supports intelligent data handling through a store-and-forward mechanism, ensuring orderly communication between multiple masters and one slave without data collision or loss.
### 2. Key Features
- Reverse Port Sharing Functionality:
Enables up to three RS232 master devices to access one RS232 slave device through controlled, sequential communication.
- Multi-Master to Single-Slave Communication:
Designed for environments where multiple MODBUS or RS232 master hosts need to access a single slave device without conflict.
- Store-and-Forward Data Handling:
Incorporates an internal buffer and handshake logic to queue and forward data, ensuring that only one master communicates with the slave at a time.
- Automatic Arbitration:
Built-in logic prioritizes master requests, servicing one master at a time while queuing others, effectively simulating independent access.
- RS232 Interface Support:
Fully compliant with RS232 electrical standards, using DB9 male connectors for all ports.
- LED Status Indicators:
Four independent LED indicators (PWR, ATRX, BTRX, CTRX, DTRX) provide real-time visual feedback for power and data transmission activity on each port.
- Compact Industrial Design:
Ruggedized enclosure measuring 90 mm × 150 mm × 27 mm, suitable for control cabinets or desktop integration.
- Low Power Consumption:
Operates at 5 VDC with a typical current draw of 400 mA, powered via an external AC adapter.
- Flexible Configuration:
DIP switch settings allow selection between RS422 and RS485 modes in other S400 variants; IS400S specifically supports RS232.
- High Compatibility:
Works seamlessly with standard RS232 devices such as PLCs, meters, sensors, printers, and industrial controllers.
- Isolation Options (Series Dependent):
Other S400 models offer galvanic isolation on master and/or slave ports for enhanced noise immunity and protection.
### 3. Technical Specifications
Electrical & Interface Specifications:
- Interface Type: RS232 (IS400S model)
- Connector Type: DB9 male connectors (4 total)
- Number of Ports: 4 (Port A – Master; Ports B, C, D – Slave)
- Signal Pins: TX+, TX−, RX+, RX−, isolated GND
- Auto Data Direction Control: Supported in RS485 configurations (not applicable to IS400S)
- Power Input: 5 VDC ±5%
- Power Consumption: 400 mA @ 5 VDC
- Power Adapter: UP110/UP220 (US/EU type), 100–240 VAC input, 5 VDC 1000 mA output
Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Enclosure Material: Industrial-grade Rayon composite housing
- Weight: Not specified (estimated < 300 g based on enclosure size and components)
- Mounting: Desktop or panel installation
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 transmit/receive activity
- BTRX: Port B transmit/receive activity
- CTRX: Port C transmit/receive activity
- DTRX: Port D transmit/receive activity
### 4. Functionality
Operational Concept:
The IS400S Reverse Port Sharer enables three independent RS232 master devices to share a single RS232 slave device. It manages communication conflicts by implementing a store-and-forward mechanism. When multiple masters attempt to communicate simultaneously, the IS400S buffers incoming data and services each master sequentially. This ensures that only one master has active communication with the slave at any given time, preventing data collision and maintaining protocol integrity.
Use Cases:
- Industrial Automation: Multiple PLCs or controllers accessing a single sensor, meter, or actuator.
- MODBUS Networks: Multiple MODBUS masters communicating with one slave device.
- Instrumentation Systems: Several monitoring systems reading data from a single measurement instrument.
- Testing and Diagnostics: Multiple test benches sharing access to one DUT (Device Under Test).
- Data Acquisition: Centralized data collection from a single device by multiple supervisory systems.
Compatibility:
- Fully compatible with RS232 standard devices.
- Supports standard baud rates and serial communication parameters (as defined by connected devices).
- Can integrate with other S400 series models for mixed RS232/RS422/RS485 environments.
Communication Flow:
1. Each master device connects to one of the three master ports (A, B, C).
2. The slave device connects to the single slave port (D).
3. When a master initiates communication, the IS400S grants access and forwards data to the slave.
4. If another master attempts communication simultaneously, its data is queued until the current transaction completes.
5. The device ensures orderly, collision-free communication through internal arbitration logic.
### 5. Components & Accessories
Included Components:
- IS400S Reverse Port Sharer main unit
- UP110 or UP220 power adapter (region-specific)
- User manual and configuration guide
Connectors:
- 4 × DB9 male connectors (Ports A–D)
- Power input jack (5 VDC)
Optional Accessories:
- RS232 extension cables (DB9 male-to-female)
- DIN rail mounting brackets (optional, depending on installation)
- Isolation adapters (for environments requiring galvanic isolation)
### 6. Installation & Setup
Requirements:
- Power supply: 5 VDC, 400 mA minimum
- Compatible RS232 cables for all connected devices
- Proper grounding for noise reduction and signal integrity
Mounting Options:
- Desktop placement for laboratory or office environments
- Panel or cabinet mounting for industrial installations
Configuration Steps:
1. Connect the power adapter to the IS400S and verify the PWR LED is illuminated.
2. Connect up to three RS232 master devices to ports A, B, and C.
3. Connect the RS232 slave device to port D.
4. Verify communication activity via the corresponding TRX LEDs.
5. No software configuration is required; the device operates transparently at the hardware level.
Notes:
- Ensure only one master transmits data at a time to maintain communication integrity.
- For applications requiring automatic direction control or RS485 operation, refer to other S400 series models (e.g., IS004S or S434io).
### 7. Performance & Capabilities
Communication Performance:
- Transparent data transmission between masters and slave
- Store-and-forward buffering ensures no data loss during arbitration
- Supports standard RS232 baud rates (up to 115.2 kbps, depending on connected devices)
- Low latency switching between master sessions
Capacity:
- Supports up to three master devices and one slave device simultaneously connected
- Internal logic ensures sequential access without manual intervention
Efficiency:
- Intelligent queuing minimizes idle time between master requests
- Low power consumption (2 W typical) for continuous operation
Limitations:
- Only one master can actively communicate with the slave at any given moment
- Not designed for simultaneous multi-master data transmission
- RS232 cable length and baud rate limitations apply as per EIA/TIA-232 standards
### 8. Standards & Compliance
Electrical Standards:
- RS232 compliant (EIA/TIA-232)
- Power supply compliant with international safety standards (100–240 VAC input)
Environmental Compliance:
- Designed for industrial temperature and humidity ranges
- RoHS-compliant materials (lead-free construction)
Industry Standards:
- Compatible with MODBUS RTU and other serial communication protocols
- Meets general EMC and safety requirements for industrial communication devices
Certifications:
- Manufacturer adheres to ISO 9001 quality management standards
- CE and FCC compliance (typical for Rayon serial communication products)
### 9. Additional Information
Warranty:
- Standard manufacturer warranty (typically 1 year, subject to region and distributor policy)
Support & Maintenance:
- Technical support available via email (rayon@ms1.hinet.net)
- Firmware and documentation updates provided through official website
- Maintenance-free operation; no internal user-serviceable parts
Product Family Overview:
The IS400S is part of Rayon’s S400 Series, which includes multiple configurations for different interface types and isolation requirements:
- 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
- S234io: Isolated RS232 master to 3 isolated RS422/485 slaves
- IS004S: Reverse port sharer for multiple RS485 masters to one slave
Maintenance Recommendations:
- Keep device in a dry, dust-free environment
- Avoid exposure to extreme temperatures or humidity
- Periodically inspect connectors for oxidation or mechanical wear
Software & Firmware:
- Operates as a hardware-level device; no driver or firmware configuration required
- Compatible with any operating system supporting RS232 communication
Applications Summary:
The IS400S is ideal for industrial control, automation, and monitoring systems where multiple controllers or PCs need to share a single serial device. It ensures reliable, conflict-free communication through intelligent data management, making it suitable for MODBUS networks, instrumentation systems, and data acquisition setups.
### Summary
The Rayon IS400S Reverse Port Sharer is a robust, hardware-based serial communication management device that enables three RS232 master devices to share access to one RS232 slave device. It belongs to the S400 Series, known for its flexibility, reliability, and industrial-grade design. With store-and-forward logic, LED diagnostics, and low power consumption, the IS400S ensures seamless, collision-free communication in multi-master environments. Its compact form factor, wide environmental tolerance, and compliance with RS232 standards make it a dependable solution for automation, instrumentation, and data communication applications.
Manufacturer: Rayon Technology Co., Ltd.
Model: IS400S
Series: S400 Series
Interface: RS232
Ports: 3 Masters → 1 Slave
Power: 5 VDC, 400 mA
Dimensions: 90 × 150 × 27 mm
Operating Temp: 0–55°C
Use Case: Multi-master serial communication management for industrial and automation systems.
### 1. Product Overview
Product Name: IS400S Reverse Port Sharer
Model: IS400S
Series: S400 Series (Serial Port Sharer Family)
Article Number: IS400S
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.rayontech.com](http://www.rayontech.com), [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)
Product Description:
The IS400S is a reverse serial port sharer designed to allow multiple RS232 master devices to communicate with a single RS232 slave device. It belongs to Rayon’s S400 Series of serial communication management devices, engineered for industrial and automation environments where multiple controllers or hosts need to share access to a single serial peripheral. The IS400S supports intelligent data handling through a store-and-forward mechanism, ensuring orderly communication between multiple masters and one slave without data collision or loss.
### 2. Key Features
- Reverse Port Sharing Functionality:
Enables up to three RS232 master devices to access one RS232 slave device through controlled, sequential communication.
- Multi-Master to Single-Slave Communication:
Designed for environments where multiple MODBUS or RS232 master hosts need to access a single slave device without conflict.
- Store-and-Forward Data Handling:
Incorporates an internal buffer and handshake logic to queue and forward data, ensuring that only one master communicates with the slave at a time.
- Automatic Arbitration:
Built-in logic prioritizes master requests, servicing one master at a time while queuing others, effectively simulating independent access.
- RS232 Interface Support:
Fully compliant with RS232 electrical standards, using DB9 male connectors for all ports.
- LED Status Indicators:
Four independent LED indicators (PWR, ATRX, BTRX, CTRX, DTRX) provide real-time visual feedback for power and data transmission activity on each port.
- Compact Industrial Design:
Ruggedized enclosure measuring 90 mm × 150 mm × 27 mm, suitable for control cabinets or desktop integration.
- Low Power Consumption:
Operates at 5 VDC with a typical current draw of 400 mA, powered via an external AC adapter.
- Flexible Configuration:
DIP switch settings allow selection between RS422 and RS485 modes in other S400 variants; IS400S specifically supports RS232.
- High Compatibility:
Works seamlessly with standard RS232 devices such as PLCs, meters, sensors, printers, and industrial controllers.
- Isolation Options (Series Dependent):
Other S400 models offer galvanic isolation on master and/or slave ports for enhanced noise immunity and protection.
### 3. Technical Specifications
Electrical & Interface Specifications:
- Interface Type: RS232 (IS400S model)
- Connector Type: DB9 male connectors (4 total)
- Number of Ports: 4 (Port A – Master; Ports B, C, D – Slave)
- Signal Pins: TX+, TX−, RX+, RX−, isolated GND
- Auto Data Direction Control: Supported in RS485 configurations (not applicable to IS400S)
- Power Input: 5 VDC ±5%
- Power Consumption: 400 mA @ 5 VDC
- Power Adapter: UP110/UP220 (US/EU type), 100–240 VAC input, 5 VDC 1000 mA output
Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Enclosure Material: Industrial-grade Rayon composite housing
- Weight: Not specified (estimated < 300 g based on enclosure size and components)
- Mounting: Desktop or panel installation
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 transmit/receive activity
- BTRX: Port B transmit/receive activity
- CTRX: Port C transmit/receive activity
- DTRX: Port D transmit/receive activity
### 4. Functionality
Operational Concept:
The IS400S Reverse Port Sharer enables three independent RS232 master devices to share a single RS232 slave device. It manages communication conflicts by implementing a store-and-forward mechanism. When multiple masters attempt to communicate simultaneously, the IS400S buffers incoming data and services each master sequentially. This ensures that only one master has active communication with the slave at any given time, preventing data collision and maintaining protocol integrity.
Use Cases:
- Industrial Automation: Multiple PLCs or controllers accessing a single sensor, meter, or actuator.
- MODBUS Networks: Multiple MODBUS masters communicating with one slave device.
- Instrumentation Systems: Several monitoring systems reading data from a single measurement instrument.
- Testing and Diagnostics: Multiple test benches sharing access to one DUT (Device Under Test).
- Data Acquisition: Centralized data collection from a single device by multiple supervisory systems.
Compatibility:
- Fully compatible with RS232 standard devices.
- Supports standard baud rates and serial communication parameters (as defined by connected devices).
- Can integrate with other S400 series models for mixed RS232/RS422/RS485 environments.
Communication Flow:
1. Each master device connects to one of the three master ports (A, B, C).
2. The slave device connects to the single slave port (D).
3. When a master initiates communication, the IS400S grants access and forwards data to the slave.
4. If another master attempts communication simultaneously, its data is queued until the current transaction completes.
5. The device ensures orderly, collision-free communication through internal arbitration logic.
### 5. Components & Accessories
Included Components:
- IS400S Reverse Port Sharer main unit
- UP110 or UP220 power adapter (region-specific)
- User manual and configuration guide
Connectors:
- 4 × DB9 male connectors (Ports A–D)
- Power input jack (5 VDC)
Optional Accessories:
- RS232 extension cables (DB9 male-to-female)
- DIN rail mounting brackets (optional, depending on installation)
- Isolation adapters (for environments requiring galvanic isolation)
### 6. Installation & Setup
Requirements:
- Power supply: 5 VDC, 400 mA minimum
- Compatible RS232 cables for all connected devices
- Proper grounding for noise reduction and signal integrity
Mounting Options:
- Desktop placement for laboratory or office environments
- Panel or cabinet mounting for industrial installations
Configuration Steps:
1. Connect the power adapter to the IS400S and verify the PWR LED is illuminated.
2. Connect up to three RS232 master devices to ports A, B, and C.
3. Connect the RS232 slave device to port D.
4. Verify communication activity via the corresponding TRX LEDs.
5. No software configuration is required; the device operates transparently at the hardware level.
Notes:
- Ensure only one master transmits data at a time to maintain communication integrity.
- For applications requiring automatic direction control or RS485 operation, refer to other S400 series models (e.g., IS004S or S434io).
### 7. Performance & Capabilities
Communication Performance:
- Transparent data transmission between masters and slave
- Store-and-forward buffering ensures no data loss during arbitration
- Supports standard RS232 baud rates (up to 115.2 kbps, depending on connected devices)
- Low latency switching between master sessions
Capacity:
- Supports up to three master devices and one slave device simultaneously connected
- Internal logic ensures sequential access without manual intervention
Efficiency:
- Intelligent queuing minimizes idle time between master requests
- Low power consumption (2 W typical) for continuous operation
Limitations:
- Only one master can actively communicate with the slave at any given moment
- Not designed for simultaneous multi-master data transmission
- RS232 cable length and baud rate limitations apply as per EIA/TIA-232 standards
### 8. Standards & Compliance
Electrical Standards:
- RS232 compliant (EIA/TIA-232)
- Power supply compliant with international safety standards (100–240 VAC input)
Environmental Compliance:
- Designed for industrial temperature and humidity ranges
- RoHS-compliant materials (lead-free construction)
Industry Standards:
- Compatible with MODBUS RTU and other serial communication protocols
- Meets general EMC and safety requirements for industrial communication devices
Certifications:
- Manufacturer adheres to ISO 9001 quality management standards
- CE and FCC compliance (typical for Rayon serial communication products)
### 9. Additional Information
Warranty:
- Standard manufacturer warranty (typically 1 year, subject to region and distributor policy)
Support & Maintenance:
- Technical support available via email (rayon@ms1.hinet.net)
- Firmware and documentation updates provided through official website
- Maintenance-free operation; no internal user-serviceable parts
Product Family Overview:
The IS400S is part of Rayon’s S400 Series, which includes multiple configurations for different interface types and isolation requirements:
- 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
- S234io: Isolated RS232 master to 3 isolated RS422/485 slaves
- IS004S: Reverse port sharer for multiple RS485 masters to one slave
Maintenance Recommendations:
- Keep device in a dry, dust-free environment
- Avoid exposure to extreme temperatures or humidity
- Periodically inspect connectors for oxidation or mechanical wear
Software & Firmware:
- Operates as a hardware-level device; no driver or firmware configuration required
- Compatible with any operating system supporting RS232 communication
Applications Summary:
The IS400S is ideal for industrial control, automation, and monitoring systems where multiple controllers or PCs need to share a single serial device. It ensures reliable, conflict-free communication through intelligent data management, making it suitable for MODBUS networks, instrumentation systems, and data acquisition setups.
### Summary
The Rayon IS400S Reverse Port Sharer is a robust, hardware-based serial communication management device that enables three RS232 master devices to share access to one RS232 slave device. It belongs to the S400 Series, known for its flexibility, reliability, and industrial-grade design. With store-and-forward logic, LED diagnostics, and low power consumption, the IS400S ensures seamless, collision-free communication in multi-master environments. Its compact form factor, wide environmental tolerance, and compliance with RS232 standards make it a dependable solution for automation, instrumentation, and data communication applications.
Manufacturer: Rayon Technology Co., Ltd.
Model: IS400S
Series: S400 Series
Interface: RS232
Ports: 3 Masters → 1 Slave
Power: 5 VDC, 400 mA
Dimensions: 90 × 150 × 27 mm
Operating Temp: 0–55°C
Use Case: Multi-master serial communication management for industrial and automation systems.
-
S400_Catalog.pdf
PDF Catalog
-
S232 Application Note.pdf
Manual
-
2017Computex6_en IS004S.pdf
Manual
No accessories available.