1. Product Overview

Product Name: IPort138-I
Model: IPORT138I
Series: IPORT / APORT Series – IP to Serial Port Converters
Article Number: IPort138-I
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 / info@rayontech.com.tw
Websites: [www.rayontech.com.tw](http://www.rayontech.com.tw), [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)

The IPort138-I is a Linux-based IP device server designed to convert Ethernet (10/100Base-TX) communication into multiple isolated serial interfaces. It provides eight ground-isolated RS422/RS485 ports and is engineered for industrial and automation environments requiring reliable serial-to-IP connectivity. The device integrates a 32-bit MIPS RISC CPU running at 100 MHz, with 16 MB Flash ROM and 16 MB SDRAM, ensuring stable embedded Linux operation and efficient data handling across multiple serial channels.

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2. Key Features

- Eight Ground-Isolated Serial Ports: Supports 8 independent RS422/RS485 interfaces, each configurable via DIP switch or software. Isolation ensures protection against ground loops and electrical noise.
- Ethernet Connectivity: Auto-detecting 10/100 Mbps Ethernet interface (RJ45 connector) for flexible network integration.
- Embedded Linux System: Provides a robust, multitasking environment for network and serial data management.
- Flexible Communication Modes: Supports TCP Server, TCP Client, UDP Send/Receive, and UDP Multi-Serial modes.
- Cross-Platform Driver Support:
- Windows NT/2000/XP/Vista/7/8/10 Virtual COM driver
- Linux raw TTY driver
- SCO UNIX real TTY driver
- Web, Telnet, and Console Configuration: Multiple setup interfaces for network and serial configuration.
- Auto Data Direction Control: Automatic transmit/receive switching for RS485 communication.
- High-Speed Serial Transmission: Supports baud rates up to 230,400 bps.
- Ground Isolation: Each serial port is galvanically isolated from the system ground, enhancing reliability in industrial environments.
- Compact Industrial Design: Rugged metal enclosure suitable for DIN-rail or panel mounting.
- Firmware Upgradeable: Supports TFTP-based firmware updates via console or network.
- Low Power Consumption: Operates at 5 VDC, 1.6 A typical.

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3. Technical Specifications

Processor & Memory:
- CPU: 32-bit MIPS RISC, 100 MHz
- Flash ROM: 16 MB
- SDRAM: 16 MB

Network Interface:
- Type: 10/100 Mbps Ethernet (100Base-TX)
- Connector: RJ45
- Auto-negotiation: 10/100 Mbps detection
- Protocols: TCP/IP, UDP/IP

Serial Interfaces:
- Type: Ground-isolated RS422/RS485
- Connector: DB9 male (x8)
- Port Count: 8 independent channels
- Baud Rate: Up to 230,400 bps
- Configuration: DIP switch or software selectable
- Isolation: Electrical ground isolation per port
- Console Port: Shared with Serial Port 1

Power Requirements:
- Input Voltage: 5 VDC
- Current Consumption: 1.6 A (typical)

Physical Characteristics:
- Dimensions: 205 × 135 × 48 mm
- Weight: Approx. 0.8–1.0 kg (typical, depending on enclosure)
- Material: Metal chassis (Rayon industrial-grade housing)

Environmental Conditions:
- Operating Temperature: +5°C to +40°C
- Storage Temperature: 0°C to +65°C
- Operating Humidity: 10–90% RH (non-condensing)
- Storage Humidity: 5–90% RH

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4. Functionality

The IPort138-I functions as an IP-to-serial converter, bridging Ethernet networks with multiple serial devices. It allows remote access, monitoring, and control of RS422/RS485 equipment over TCP/IP or UDP/IP networks.

Operating Modes:
- TCP Server Mode: The device listens for incoming TCP connections, allowing remote clients to access serial ports as network sockets or virtual COM ports.
- TCP Client Mode: Initiates connections to a designated server, suitable for centralized data collection.
- UDP Send/Receive Mode: Enables broadcast or point-to-point UDP communication for low-latency data exchange.
- UDP Multi-Serial Mode: Allows multiple serial ports to share the same UDP port number for simultaneous data transmission.

Configuration Interfaces:
- Web Browser: Access via HTTP for full configuration (default IP: 192.168.1.254, default password: 11111).
- Telnet: Command-line configuration and diagnostics.
- Console Port: Local setup via serial terminal (115200 bps, 8N1).

Use Cases:
- Industrial automation and SCADA systems
- Building management and HVAC control
- Remote monitoring of PLCs, sensors, and controllers
- Serial device networking (e.g., barcode scanners, meters, HMI panels)
- Modbus RTU to Modbus TCP/IP bridging

Compatibility:
- Windows systems (NT through Windows 10) via virtual COM drivers
- Linux and UNIX systems via TTY drivers
- Supports integration with third-party software using standard TCP/UDP sockets

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5. Components & Accessories

Included Items:
- IPort138-I main unit
- 5 VDC power adapter (UP110 or UP220)
- User manual and software CD (includes drivers and utilities)

Optional Accessories:
- DIN-rail mounting kit
- Replacement power adapter
- Console cable (RS232)
- Firmware upgrade utilities (WFTP8.exe for Windows, TFTP client for Linux)

Connectors:
- Ethernet: RJ45 (10/100Base-TX)
- Serial Ports: 8 × DB9 male connectors
- Power Input: Barrel-type DC jack (5 VDC)

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6. Installation & Setup

Hardware Installation:
1. Connect the Ethernet port to a network hub or switch using a standard CAT5/6 cable.
2. Connect serial devices to the DB9 ports.
3. Configure DIP switches for RS422 or RS485 mode:
- ON = RS422
- OFF = RS485
4. Connect the 5 VDC power adapter (use only UP110/UP220 models).
5. Observe LED indicators for power and network link status.

Software Setup:
- Access the web interface at the default IP (192.168.1.254).
- Configure network parameters (static IP, subnet mask, gateway).
- Assign serial port modes and communication parameters (baud rate, parity, stop bits).
- Save and reboot to apply settings.

Driver Installation (Windows):
- Use aport_ap.exe or tport_ap.exe utilities to map serial ports to virtual COM ports.
- Install drivers via ainstall.exe or tinstall.exe depending on mode.
- Verify COM port assignments in Device Manager.

Linux/UNIX Setup:
- Install gvmodem or rtty drivers.
- Configure `/etc/gtstcpd/gtstcpd.cf` or `/etc/nasd.rc` for IP and port mapping.
- Start the daemon using `./gtstcpd.rc start`.

Firmware Upgrade:
- Enter firmware upgrade mode via DIP switch (bit 2 ON).
- Use TFTP or WFTP8.exe to upload new firmware image.
- Default upgrade IP: 192.168.1.254.

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7. Performance & Capabilities

- Serial Speed: Up to 230.4 kbps per port
- Network Throughput: 10/100 Mbps auto-sensing
- Latency: Dependent on network conditions; optimized for low-latency serial data exchange
- Concurrent Connections: Up to 8 independent serial sessions
- Data Integrity: TCP ensures reliable delivery; UDP supports low-latency streaming
- Auto Direction Control: RS485 mode automatically manages transmit/receive switching
- Buffering: Internal buffering ensures smooth data flow between serial and network interfaces
- Driver Modes:
- TPORT Driver: Maintains persistent TCP connections for dedicated Windows systems
- RPORT Driver: Allows dynamic connection/disconnection for multi-user environments

Limitations:
- TCP latency may affect time-sensitive applications compared to direct COM ports.
- Only one host can occupy a serial port in TPORT mode.
- Requires static IP configuration for stable operation in industrial networks.

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8. Standards & Compliance

- Network Standards: IEEE 802.3 10/100Base-TX
- Serial Standards: EIA/TIA RS422, RS485
- Protocol Support: TCP/IP, UDP/IP, RFC2217 (Telnet COM port control)
- Operating System Compatibility: Windows NT/2000/XP/Vista/7/8/10, Linux, SCO UNIX
- Safety & EMC: Designed for industrial-grade operation with ground isolation
- Firmware Upgrade Protocol: TFTP compliant

Certifications:
While specific certifications are not listed, Rayon Technology products are typically compliant with CE and FCC Class A industrial standards.

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9. Additional Information

Warranty:
- Standard 1-year limited warranty covering defects in materials and workmanship.
- Excludes damage from misuse, unauthorized servicing, or incorrect power supply.
- Out-of-warranty repairs available at a flat-rate service charge.

Support & Maintenance:
- Technical support via email (rayon@ms1.hinet.net).
- Firmware updates and driver downloads available from the manufacturer’s website.
- RMA (Return Material Authorization) required for repairs; contact Rayon for RMA number and return instructions.

Maintenance Recommendations:
- Use only approved 5 VDC adapters.
- Maintain clean, dry installation environment.
- Periodically check firmware version and update as needed.
- Verify network connectivity using “ping” or built-in diagnostics.

Related Products in the APORT/IPORT Series:
- APORT200: IP to 2 × RS232 converter
- APORT020: IP to 2 × isolated RS232 converter
- APORT101: IP to 1 × RS232 + 1 × RS422/485 converter
- APORT400 / APORT040: IP to 4 × RS232 or isolated RS232 converter
- APORT080 / APORT008: IP to 8 × RS232 or isolated RS422/485 converter
- IPORT134I: IP to 4 × isolated RS422/485 converter
- IPORT114 / IPORT118: IP to 4 or 8 × RS232/RS422/RS485 converter

Firmware & Utility Tools:
- aport_ap.exe / tport_ap.exe: Configuration utilities for Windows
- aport_search.exe / tport_search.exe: Network discovery tools
- wftp8.exe: Windows firmware upgrade utility
- gvmodem / rtty drivers: UNIX/Linux serial mapping daemons

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### Summary

The Rayon IPort138-I is a high-performance, Linux-based IP device server engineered for industrial serial networking. It bridges Ethernet and serial communication seamlessly, offering eight isolated RS422/RS485 ports configurable through hardware or software. With robust TCP/UDP support, cross-platform drivers, and flexible configuration interfaces, it enables reliable remote access to serial devices across diverse operating systems. Its embedded Linux architecture, isolation design, and comprehensive driver suite make it ideal for automation, SCADA, and industrial control applications requiring stable, multi-port serial-to-IP connectivity.