Comprehensive Product Summary – RAYON TWIN485 Double RS-232 to RS-422/485 Isolated Converter and Bridge

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### 1. Product Overview

Product Name: TWIN485
Model: TWIN485-001
Series: Industrial Ground-Isolated Converter & Bridge Series
Article Number: TWIN485
Manufacturer: RAYON Technology Co., Ltd.
Manufacturer Address: 2F, No. 177, Chung Shan 2 Rd., Lu Chou City, Taipei Hsien, Taiwan, R.O.C.
Contact: Tel: +886-2-82858362 | Fax: +886-2-82857065
Email: rayon@ms1.hinet.net
Website: [www.rayontech.com](http://www.rayontech.com)

The RAYON TWIN485 is a dual-channel, industrial-grade RS-232 to RS-422/RS-485 converter and bridge module designed for robust serial communication in automation, control, and monitoring environments. It integrates two fully isolated RS-232 to RS-422/485 conversion circuits within a single metal enclosure, offering redundancy, monitoring, and bridging capabilities. The device supports both NORMAL and BRIDGE modes, enabling it to function as two independent converters or as a repeater/bridge between RS-422/485 segments.

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### 2. Key Features

- Dual Conversion Capability: Two independent RS-232 to RS-422/RS-485 converters in one enclosure.
- Bridge and Repeater Functionality: Operates as RS422↔RS422 repeater or RS485↔RS485 bridge.
- Flexible Mode Selection: DIP switch selectable NORMAL (dual converter) or BRIDGE (repeater/bridge) mode.
- Full Ground Isolation: Each RS-422/485 port is galvanically isolated to prevent ground loops and protect equipment.
- Auto Data Direction Control: Automatic TX/RX switching for RS-485 half-duplex communication.
- Wide Baud Rate Support: 50 to 230,400 baud.
- Industrial Power Range: Accepts 9–32 VDC input at 2.5 W via screw terminal or DC jack.
- LED Indicators: Power and TX/RX activity LEDs for both RS-232 ports.
- Compact Metal Enclosure: Rugged 150 × 84 × 25 mm housing for industrial environments.
- Redundancy and Monitoring: Dual-port design allows one converter to act as a live backup or monitoring channel.
- Configurable Termination: 120 Ω termination resistor selectable via DIP switch.
- Compatibility: Works with PC COM ports, PCI serial cards (P422I, P584, P588), and other RAYON interface modules.
- OEM Power Option: RS-232 Port A pin 9 can be configured as DC power input for custom integration.

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### 3. Technical Specifications

Physical Characteristics
- Dimensions: 150 mm (L) × 84 mm (W) × 25 mm (H)
- Weight: Approx. 300 g (metal enclosure)
- Enclosure Material: Industrial-grade metal housing
- Mounting: Desktop or panel-mount (optional brackets)

Electrical Characteristics
- Power Supply: 9–32 VDC, 2.5 W typical
- Power Input Options:
- 2-pin screw terminal (+VDC, GND)
- Standard DC power jack (inner +VDC, outer GND)
- Optional RS-232 Port A pin 9 as +VDC input (OEM option)
- Isolation: Full galvanic isolation between RS-232 and RS-422/485 ports
- Power Ground: Common with RS-232 signal ground

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

Communication Interfaces
- RS-232 Interface:
- Connector: DB9 male (2 ports)
- Signals: TXD, RXD, GND (pins 2, 3, 5)
- Baud Rate: 50–230,400 bps
- LED Indicators: ATXD, ARXD, BTXD, BRXD
- RS-422/RS-485 Interface:
- Connector: 5-pin screw terminal block per port
- Signals: TX+, TX–, RX+, RX–, isolated GND
- Isolation: Each port isolated from others
- Termination: 120 Ω selectable via DIP switch
- Mode: RS-422 (full-duplex) or RS-485 (half-duplex) selectable
- Auto Direction Control: Supported in RS-485 mode

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### 4. Functionality

The TWIN485 serves as a multi-purpose serial communication interface that can operate in two primary modes:

1. NORMAL Mode:
- Each RS-232 port independently converts to RS-422 or RS-485.
- Enables two separate serial channels for connecting PCs, PLCs, or controllers to field devices.
- Ideal for redundant or dual-network setups.

2. BRIDGE Mode:
- Functions as a repeater or bridge between two RS-422/485 segments.
- Extends communication distance beyond 4000 feet or increases node capacity beyond 32 devices per segment.
- RS-232 Port A remains active for monitoring or control.

Use Cases:
- Industrial automation and SCADA systems
- Building management and HVAC control
- Remote data acquisition and telemetry
- Redundant communication links for critical systems
- RS-485 network extension or segmentation
- RS-422 to RS-485 protocol conversion

Compatibility:
- Compatible with RAYON PCI serial cards (P422I, P485, P584, P588)
- Works with standard PC COM ports via A101 null-modem cable
- Supports integration with OEM systems using custom power input

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### 5. Components & Accessories

Included Components:
- TWIN485 converter unit
- User manual
- Optional DC power adapter (varies by package)

Optional Accessories:
- A101 Cable: 6 ft DB9 female-to-female null modem cable for PC COM port connection.
- A405 Cable: 6 ft DB37 male to four DB9 female cable for P584 card connection.
- R805 Cable: 6 ft DB62 male to eight DB9 female cable for P588 card connection.
- Power Adapter: 12 VDC, 500–1000 mA (supports up to 5 TWIN485 units when daisy-chained).

Connector Pinouts:
- RS-232 DB9 Male:
- Pin 2: RXD (input)
- Pin 3: TXD (output)
- Pin 5: GND
- Pins 1, 4, 6 shorted internally; pins 7–8 shorted internally
- Pin 9: Optional +VDC input (OEM)
- RS-422/485 Terminal Block:
- TXD–, TXD+, RXD–, RXD+, isolated GND per port

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### 6. Installation & Setup

Pre-Installation Requirements:
- Verify power supply (9–32 VDC)
- Confirm correct DIP switch settings for interface type and mode
- Ensure proper cable selection (A101, A405, or R805)

Installation Steps:
1. Set Function Mode:
- DIP switch bit 1 ON = NORMAL mode
- DIP switch bit 1 OFF = BRIDGE mode
2. Set Interface Type:
- Bits 1–3 OFF = RS-422 mode
- Bits 1–3 ON = RS-485 mode
- Bit 4 ON = 120 Ω termination enabled
3. Connect RS-422/485 Wiring:
- Use twisted-pair shielded cable for differential signals.
4. Apply Power:
- Connect DC adapter or terminal block input (do not use both simultaneously).
5. Connect RS-232 Devices:
- Attach DB9 cables to PC COM ports or serial cards.
6. Verify Operation:
- Check LED indicators for power and data activity.

Mounting Options:
- Desktop placement or panel mounting (optional brackets).
- Daisy-chain power wiring supported for multiple units.

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### 7. Performance & Capabilities

- Baud Rate Range: 50 to 230,400 bps
- Transmission Distance:
- RS-422: up to 4000 ft (1200 m) per segment
- RS-485: up to 4000 ft (1200 m) per segment, 32 nodes per segment
- Bridge Extension: Doubles network length or node capacity when used as RS-485 bridge.
- Signal Isolation: Prevents ground potential differences and electrical interference.
- Auto Direction Control: Eliminates need for software flow control in RS-485 mode.
- Redundancy: Dual converters allow real-time monitoring and backup operation.
- Efficiency: Combines converter and bridge functions, reducing hardware cost and maintenance inventory.
- Limitations:
- RS-232 Port B inactive in BRIDGE mode.
- Only one power input source should be used at a time.
- RS-485 termination should be applied only at network ends.

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### 8. Standards & Compliance

- Electrical Isolation: Meets industrial isolation standards for serial communication.
- EMC Compliance: Designed for industrial electromagnetic compatibility (EMI/RFI immunity).
- Safety: Operates within low-voltage DC range; protected against reverse polarity.
- Environmental: Suitable for industrial temperature and humidity ranges.
- Quality Assurance: Manufactured under RAYON’s ISO-compliant quality system.
- Trademark Notice: All product names and trademarks are property of their respective owners.

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### 9. Additional Information

Warranty:
- One-year limited warranty covering defects in materials and workmanship.
- Excludes damage from misuse, electrical surges, or unauthorized servicing.
- Out-of-warranty repairs available at flat-rate service charge.

Support & RMA Procedure:
- Obtain RMA number before returning products.
- Provide model number, serial number, purchase order, and fault description.
- Contact RAYON Service Center for repair authorization and shipping instructions.

Maintenance:
- Periodically inspect connectors and wiring for corrosion or looseness.
- Verify DIP switch settings after relocation or reconfiguration.
- Use only DC power adapters within specified voltage range.

Firmware & Updates:
- Hardware-based device; no firmware updates required for standard operation.
- OEM customization available for specialized RS-485 protocols.

Related Products:
- TRP-C06: Single-port isolated RS-232 to RS-422/485 converter.
- P422I: PCI card with two isolated RS-422/485 ports.
- P485: PCI card with four isolated RS-422/485 ports.
- RS4232-4 / RS4232-8: Multi-port RS-232 to isolated RS-422/485 converter boxes.
- RCON485: Addressable RS-232 to RS-485 converter for OEM applications.

Cost Efficiency:
The TWIN485 consolidates the functions of two converters and one bridge into a single device, reducing hardware count and maintenance costs by up to 50% compared to traditional setups using separate TRP-C06 and TRP-C07 units.

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### Summary

The RAYON TWIN485 is a versatile, industrial-grade communication interface that merges dual RS-232 to RS-422/485 conversion, isolation, and bridging into one compact, ruggedized unit. Its configurable modes, robust isolation, and redundancy features make it ideal for mission-critical serial communication networks. Whether used as a dual converter, repeater, or RS-485 bridge, the TWIN485 provides a cost-effective, reliable, and flexible solution for expanding and maintaining industrial serial networks.