1. Product Overview

Product Name: APort022
Model: APort022
Series: APORT400 Series – IP to Serial Port Converter
Article Number: APort022
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)

The Rayon APort022 is a compact, high-performance IP Device Server designed to convert Ethernet-based TCP/IP or UDP/IP communication into multiple isolated serial interfaces. It belongs to the APORT400 series, which provides flexible combinations of RS232 and RS422/485 ports for industrial and automation applications. The APort022 specifically offers two ground-isolated RS232 ports and two ground-isolated RS422/485 ports, enabling secure and noise-resistant serial communication over IP networks.

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2. Key Features

- Multi-Port Serial Connectivity: Provides 4 serial ports in total — 2 isolated RS232 and 2 isolated RS422/485 interfaces, all accessible via a single Ethernet connection.
- Ethernet Interface: Supports 10/100 Mbps auto-detecting Ethernet (100Base-T) through an RJ45 connector.
- High-Performance CPU: Equipped with a 32-bit 100 MHz MIPS RISC processor, offering superior performance compared to 16-bit architectures.
- Memory Resources: 16 MB Flash ROM and 16 MB SDRAM for stable operation and firmware storage.
- Ground Isolation: Each RS232 and RS422/485 port is galvanically isolated from ground, minimizing electrical interference and ensuring reliable data transmission in industrial environments.
- 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 Virtual COM driver (APORT or TPORT mode)
- Linux raw TTY driver (GVMODEM mode)
- SCO UNIX real TTY driver (RTTY mode)
- Web, Telnet, and Console Configuration: Multiple setup interfaces for network and serial configuration.
- Firmware Upgradeable: Supports TFTP-based firmware updates via console and DIP switch control.
- Compact and Durable Design: Metal enclosure with small footprint suitable for DIN-rail or desktop installation.
- Low Power Consumption: Operates at 5 VDC, 1200 mA.
- Industrial Reliability: Designed for continuous operation in 5–40°C environments with up to 90% relative humidity.

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3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| CPU | 32-bit 100 MHz MIPS RISC processor |
| Flash ROM | 16 MB |
| SDRAM | 16 MB |
| Ethernet Interface | 10/100 Mbps auto-detecting (100Base-T) |
| Ethernet Connector | RJ45 |
| Serial Ports | 4 total (2 isolated RS232, 2 isolated RS422/485) |
| Serial Connectors | DB9 male |
| Serial Speed | Up to 230,400 bps |
| Isolation | Ground isolation on all serial ports |
| Power Supply | 5 VDC @ 1200 mA (UP110/UP220 adapter) |
| Dimensions | 205 × 135 × 29 mm |
| Weight | Approx. 0.6 kg (typical) |
| 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 |
| Enclosure Material | Metal (Rayon industrial-grade housing) |
| Mounting Options | Desktop or DIN-rail (optional) |

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4. Functionality

The APort022 functions as an IP-to-serial converter, bridging Ethernet-based communication with traditional serial devices. It allows remote access and control of serial equipment over LAN or WAN networks using TCP/IP or UDP/IP protocols.

Operating Modes:
- TCP Server Mode: The APort022 listens for incoming TCP connections on assigned port numbers, allowing remote clients to connect and exchange serial data.
- TCP Client Mode: The device initiates a connection to a predefined server IP and port, suitable for centralized data collection.
- UDP Mode: Enables broadcast or point-to-multipoint communication, sending serial data to up to four remote hosts.
- UDP Multi-Serial Mode: Allows multiple serial ports to share the same UDP port number for simultaneous data distribution.
- Real TTY Modes:
- *COM Real TTY Mode* (Windows/SCO): Uses UDP packets to emulate standard COM ports.
- *GVMODEM Real TTY Mode* (Linux/UNIX): Uses TCP packets to emulate fixed virtual terminals.

Use Cases:
- Industrial automation and SCADA systems
- Remote monitoring and control of PLCs, HMIs, and sensors
- Serial device networking (barcode scanners, meters, POS systems)
- MODBUS RTU/TCP protocol bridging
- Data acquisition and logging over IP networks

Compatibility:
- Windows NT/2000/XP/Vista/7 (APORT and TPORT drivers)
- Linux and UNIX systems (GVMODEM and RTTY drivers)
- Compatible with standard terminal emulators, Telnet clients, and web browsers for configuration.

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5. Components & Accessories

Included Items:
- APort022 main unit
- UP110 or UP220 5VDC power adapter
- User manual and software CD (drivers, utilities, and documentation)

Optional Accessories:
- DIN-rail mounting kit
- RS232/RS485/RS422 cables
- Console cable for setup and firmware upgrade
- Replacement power adapter

Connectors:
- Ethernet: RJ45 (10/100Base-T)
- Serial: DB9 male connectors (4 total)
- Console Port: Shared with Serial Port 1 (configurable via DIP switch)

Pin Assignments (DB9 Male):
- RS232: DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS, RI
- RS422/485: TX+, TX–, RX+, RX–, isolated GND
- RS485 Mode: Short pins 2 & 3 (DATA+), 4 & 6 (DATA–); optional 10KΩ or 680Ω pull-up/pull-down resistors via pin shorting.

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6. Installation & Setup

Hardware Installation:
1. Connect the APort022 to a network hub or switch using a standard Ethernet cable.
2. Connect serial devices to the DB9 ports (RS232 or RS422/485).
3. Configure DIP switches:
- Bit 1: Console port enable (ON = console, OFF = normal serial)
- Bit 2: Firmware upgrade mode (ON = upgrade, OFF = normal)
- Bit 3: RS422/RS485 selection for Port 3 (ON = RS422, OFF = RS485)
- Bit 4: RS422/RS485 selection for Port 4 (ON = RS422, OFF = RS485)
4. Apply 5VDC power using the supplied adapter.
5. Observe LED indicators for power and LAN link status.

Software Configuration:
- Access via Web Browser (default IP: 192.168.1.254, password: 11111)
- Configure IP address (static recommended), subnet mask, and gateway.
- Set each serial port’s mode (TCP/UDP/RealTTY) and parameters (baud rate, parity, stop bits, flow control).
- Save and restart the device to apply settings.

Driver Installation (Windows):
- Use aport_ap.exe for APORT mode or tport_ap.exe for TPORT mode.
- Map virtual COM ports to APort022 serial ports.
- Install drivers via ainstall.exe or tinstall.exe utilities.
- Verify COM port assignments in Device Manager.

Firmware Upgrade:
- Enable DIP switch bit 2 (firmware mode).
- Connect via console terminal (115200 bps, 8N1).
- Use TFTP client or Rayon’s wftp8.exe utility to upload new firmware (default IP 192.168.1.254).

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7. Performance & Capabilities

- Data Rate: Up to 230.4 kbps per serial port.
- Network Throughput: 10/100 Mbps auto-negotiation.
- Latency: Dependent on network conditions; optimized via TPORT driver’s “TCP delay time” parameter.
- Concurrent Connections: Each serial port can handle one TCP/UDP session; multiple ports operate independently.
- Reliability: Heartbeat mechanism in TPORT driver detects disconnections within 10 seconds and auto-reconnects.
- Efficiency: Hardware-based RISC CPU ensures low-latency serial-to-IP conversion.
- Limitations:
- TPORT driver supports one dedicated Windows host per serial port.
- For multi-host access, use RPORT driver (dynamic connection mode).
- Network latency may affect timing-sensitive applications; adjustable via driver parameters.

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8. Standards & Compliance

- Network Protocols: TCP/IP, UDP/IP, DHCP (optional), RFC2217 (Telnet COM port control)
- Interface Standards:
- RS232 (EIA/TIA-232-F)
- RS422/RS485 (EIA/TIA-422/485-A)
- Operating System Compatibility: Windows NT/2000/XP/Vista/7, Linux, SCO UNIX, UNIX variants
- Safety & EMC: Designed for industrial environments with ground isolation and surge protection
- Firmware Upgrade Protocol: TFTP (Trivial File Transfer Protocol)
- Compliance: Conforms to Ethernet IEEE 802.3 standards

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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 a flat-rate service charge.

Support & Maintenance:
- Technical support via email (rayon@ms1.hinet.net).
- Firmware updates and utilities available from Rayon’s website.
- RMA (Return Material Authorization) required for repairs; contact Rayon Service Center for authorization and instructions.

Maintenance Recommendations:
- Use only approved 5VDC power adapters (UP110/UP220).
- Maintain clean, dry environment within specified temperature and humidity ranges.
- Periodically check firmware version and update as needed.
- Use console or web interface for diagnostics and status monitoring.

Software Utilities Provided:
- aport_ap.exe / tport_ap.exe: Virtual COM port configuration tools.
- aport_search.exe / tport_search.exe: Network discovery utilities for locating APORT devices.
- wftp8.exe: Firmware upgrade utility.
- Teraterm: Recommended terminal emulator for console access.

Troubleshooting Highlights:
- Verify power LED and LAN link indicators.
- Use “ping” to confirm network connectivity.
- Check serial port LEDs for TX/RX activity.
- Use console terminal for boot diagnostics (Linux-based system messages).
- Reset to factory defaults via web interface if configuration issues occur.

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Summary

The Rayon APort022 is a robust, Linux-based IP-to-Serial Device Server engineered for industrial and automation environments requiring reliable, isolated serial communication over Ethernet. With its combination of two isolated RS232 and two isolated RS422/485 ports, it provides flexible connectivity for diverse serial devices. The unit’s 32-bit RISC CPU, 16 MB memory, and multi-protocol support ensure high performance and compatibility across Windows, Linux, and UNIX systems. Configuration is intuitive via web, Telnet, or console interfaces, and advanced driver options (APORT, TPORT, RPORT) allow seamless integration into both single-host and multi-host network architectures.

Compact, efficient, and fully isolated, the APort022 delivers dependable serial networking performance for industrial control, data acquisition, and remote device management applications.