1. Product Overview

Product Name: APort202
Model: APORT202
Series: APORT Series – IP to Serial Port Converters
Article Number: APort202
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 Rayon APort202 is a high-performance IP Device Server designed to convert Ethernet-based TCP/IP or UDP/IP communication into multiple serial interfaces. It provides two RS232 ports and two ground-isolated RS422/RS485 ports, enabling seamless integration of serial devices into IP networks. The device is built on a 32-bit 100MHz MIPS RISC CPU running a Linux-based embedded system, offering robust performance, flexible configuration, and multi-platform driver support for Windows, Linux, and UNIX environments.

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2. Key Features

- Multi-Interface Serial Connectivity:
Provides 4 serial ports in total — 2 standard RS232 ports and 2 ground-isolated RS422/RS485 ports.
Each RS422/RS485 port supports TX+, TX-, RX+, RX-, and isolated GND signals.

- High-Performance Embedded System:
Equipped with a 32-bit 100MHz MIPS RISC CPU, 16MB Flash ROM, and 16MB SDRAM, ensuring stable and efficient data handling.

- Flexible Network Integration:
Supports 10/100Mbps Ethernet (RJ45) with auto-detection for 10Base-T or 100Base-TX operation.

- Multiple Communication Modes:
- TCP Server/Client Mode
- UDP Send/Receive Mode
- Virtual COM Port Mode (Windows)
- Real TTY Mode (UNIX/Linux)
- Web, Telnet, and Console Configuration

- Ground Isolation:
RS422/485 ports are galvanically isolated to prevent ground loops and electrical interference, ensuring reliable operation in industrial environments.

- Auto Data Direction Control:
RS485 ports support automatic data direction control, simplifying half-duplex communication without external flow control.

- Cross-Platform Driver Support:
- Windows NT/2000/XP/Vista/7/8/10: Virtual COM driver (APORT or TPORT mode)
- Linux: Raw TTY driver (GVMODEM)
- SCO UNIX: Real TTY (RTTY) driver

- Web-Based Management:
Integrated web server for configuration, monitoring, and firmware updates.

- Compact and Durable Design:
Housed in a Rayon industrial-grade enclosure, suitable for control systems, automation, and remote device management.

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3. Technical Specifications

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

Serial Interfaces:
- Total Ports: 4
- Port 1–2: RS232
- Port 3–4: Ground-isolated RS422/RS485
- Connector Type: DB9 male
- Maximum Baud Rate: 230,400 bps
- Signal Pins (RS422/485): TX+, TX-, RX+, RX-, Isolated GND
- Interface Selection: DIP switch configurable (RS422 or RS485)
- Auto Data Direction Control: Supported in RS485 mode
- Console Port: Shared with Serial Port 1

Network Interface:
- Ethernet: 10/100Mbps auto-detecting
- Connector: RJ45 (100Base-T)
- Protocols: TCP/IP, UDP/IP
- Configuration: Web, Telnet, or Console

Power Requirements:
- Input Voltage: 5V DC
- Current Consumption: 1200mA
- Power Adapter: UP110/UP220 (5VDC regulated supply)

Physical Characteristics:
- Dimensions: 205 × 135 × 29 mm
- Enclosure Material: Industrial-grade Rayon housing
- Weight: Approx. 0.6 kg (typical)

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 APort202 functions as an IP-to-Serial converter, bridging Ethernet networks with serial-based devices. It allows remote access, monitoring, and control of serial equipment over LAN or WAN environments.

Operating Modes:
1. TCP Server Mode:
The APort202 listens for incoming TCP connections on assigned port numbers. Ideal for remote terminal or SCADA systems.
2. TCP Client Mode:
Initiates a connection to a designated server IP and port, suitable for centralized data collection.
3. UDP Mode:
Supports both send and receive modes, allowing broadcast or multicast communication to up to four remote hosts.
4. Virtual COM Port Mode (Windows):
Emulates standard COM ports on Windows PCs using Rayon’s APORT or TPORT drivers.
5. Real TTY Mode (UNIX/Linux):
Provides fixed TTY device mapping for Linux and UNIX systems using GVMODEM or RTTY drivers.
6. Web/Telnet/Console Setup:
Configuration can be performed via browser (HTTP), Telnet session, or serial console.

Use Cases:
- Industrial automation and control systems
- SCADA and HMI integration
- Remote data acquisition (DAQ)
- POS and kiosk systems
- Serial device networking (PLC, sensors, meters)
- Legacy equipment IP integration

Compatibility:
- Windows NT/2000/XP/Vista/7/8/10
- Linux distributions (kernel with TTY support)
- SCO UNIX and UNIX-like systems

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5. Components & Accessories

Included Items:
- APort202 main unit
- UP110/UP220 5VDC power adapter
- User manual and software CD (drivers and utilities)

Optional Accessories:
- TB485: DB9 Female to RS485 terminal block kit
- LAN Cable: Standard RJ45 Ethernet cable
- Console Cable: RS232 cable for configuration

Connectors:
- Ethernet: RJ45 (10/100Base-T)
- Serial Ports: DB9 male connectors
- Power Input: DC jack (5VDC)

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6. Installation & Setup

Hardware Installation:
1. Connect the APort202 to a network hub or switch using a standard Ethernet cable.
2. Attach serial cables to the RS232 or RS422/485 ports as required.
3. Configure DIP switches:
- Bit 1: Console port enable (ON) / Normal serial port (OFF)
- Bit 2: Firmware upgrade mode (ON) / Normal operation (OFF)
- Bit 3: RS422 (ON) / RS485 (OFF) for Port 3
- Bit 4: RS422 (ON) / RS485 (OFF) for Port 4
4. Connect the 5VDC power adapter and power on the device.
5. Observe LED indicators for power and LAN link status.

Software Setup:
- Access the web interface via default IP 192.168.1.254 (password: 11111).
- Configure network parameters (Static IP, Netmask, Gateway).
- Assign serial port modes and TCP/UDP port numbers.
- Save and reboot to apply settings.

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

Driver Installation (Linux/UNIX):
- Extract and configure gvmodem_linux.tar or rtty100.tar packages.
- Map pseudo TTY devices to APort IP and port numbers in configuration files.
- Start the daemon using `./gtstcpd.rc start`.

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7. Performance & Capabilities

- Baud Rate: Up to 230,400 bps per serial port
- Data Bits: 5, 6, 7, or 8
- Stop Bits: 1 or 2
- Parity: None, Even, Odd
- Flow Control: Hardware (RTS/CTS), Software (XON/XOFF), or None
- Throughput: Optimized for low-latency serial-to-IP data exchange
- Network Latency: Dependent on TCP/UDP configuration and network conditions
- Auto-Reconnect: Built-in watchdog and heartbeat mechanism for TPORT driver ensures reconnection after network interruptions
- Buffering: Internal FIFO and driver-level buffering for stable data flow
- Limitations:
- TCP latency may vary under heavy network load
- Only one active TCP connection per serial port in TPORT mode
- RS485 requires correct wiring (TX+/RX+ shorted, TX-/RX- shorted)

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8. Standards & Compliance

- Ethernet Standards: IEEE 802.3 10Base-T / 100Base-TX
- Serial Standards: EIA/TIA RS232, RS422, RS485
- Network Protocols: TCP/IP, UDP/IP, DHCP (optional), ARP, ICMP, HTTP, TELNET
- RFC Compliance: Supports RFC2217 (Telnet COM Port Control Option)
- Operating System Compatibility: Windows, Linux, UNIX, SCO OpenServer
- Safety & Isolation: Ground-isolated RS422/485 ports for electrical protection
- Firmware Upgrade: TFTP-based upgrade mechanism (default IP 192.168.1.254)
- Environmental Compliance: Designed for industrial and office environments

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9. Additional Information

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

Support & Maintenance:
- Technical support via email (rayon@ms1.hinet.net).
- Firmware updates available through Rayon’s website or authorized distributors.
- RMA (Return Material Authorization) required for repairs.
- Preventive maintenance recommended: verify power supply, check LAN connectivity, and update firmware periodically.

Firmware Upgrade Procedure:
1. Set DIP switch bit 2 to ON (firmware upgrade mode).
2. Connect via console (115200bps, 8N1).
3. Use TFTP client to upload firmware image (e.g., aport400_091102.hg) to 192.168.1.254.
4. Reboot after successful transfer.

Troubleshooting Highlights:
- Verify 5VDC power and LED indicators.
- Use console terminal to monitor Linux boot messages.
- Confirm LAN connectivity using “ping”.
- Check serial port LEDs for TX/RX activity.
- Use “aport_search.exe” or “tport_search.exe” utilities to locate devices on the network.

Related Models in APORT Series:
- APORT200: 2 × RS232
- APORT020: 2 × Ground-Isolated RS232
- APORT101: 1 × RS232 + 1 × Ground-Isolated RS422/485
- APORT400: 4 × RS232
- APORT040: 4 × Ground-Isolated RS232
- APORT022: 2 × Ground-Isolated RS232 + 2 × Ground-Isolated RS422/485

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Summary

The Rayon APort202 is a versatile, industrial-grade IP-to-Serial Device Server that bridges Ethernet networks with multiple serial interfaces. With its dual RS232 and dual isolated RS422/RS485 ports, it supports a wide range of serial communication standards. Its embedded Linux system, 100MHz RISC CPU, and multi-platform driver support make it ideal for industrial automation, SCADA, and remote device management applications. The APort202 offers flexible configuration through web, Telnet, or console interfaces, ensuring reliable and secure serial communication over IP networks.