Comprehensive Product Summary – GPort108 IP Serial Server

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### 1. Product Overview

Product Name: GPort108
Model: GPort108
Series: GPORT Serial Router Series (GPort104 / GPort108 / GPort116)
Article Number: GPort108
Manufacturer: Rayon Technology Co., Ltd.

Product Description:
The GPort108 is an industrial-grade IP serial communication server designed to connect up to eight RS-232 serial devices to an Ethernet network. It functions as a serial-to-IP gateway, enabling remote access, control, and data exchange between serial equipment and networked systems. The device integrates a 32-bit 100 MHz MIPS CPU, 8 MB Flash ROM, and 16 MB SDRAM, running a compact Linux-based operating system. It supports multiple communication modes (TCP, UDP, virtual COM, and real TTY) and is compatible with Windows, UNIX, and Linux environments. The GPort108 is housed in a 1U 19-inch rack-mountable chassis and operates on 100–240 VAC power input.

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### 2. Key Features

- Multi-Port Serial Connectivity:
Provides eight independent RS-232 serial ports via RJ45 connectors, each configurable for baud rates up to 115.2 kbps.

- Network Integration:
Equipped with a 10/100 Mbps Ethernet interface (100Base-T), enabling serial devices to communicate over TCP/IP or UDP/IP networks.

- Flexible Operating Modes:
Supports multiple communication modes per port:
- COM Real TTY Mode: Virtual COM port mapping for Windows and SCO UNIX systems.
- GVMODEM Real TTY Mode: Fixed TTY device mapping for Linux and UNIX systems.
- TCP Server Mode: Allows remote clients to connect via TCP sockets or Telnet.
- TCP Client Mode: Initiates connections to designated servers.
- UDP Send/Receive Mode: Enables broadcast or multicast data transmission to up to four hosts.

- Cross-Platform Driver Support:
Includes drivers for Windows NT/2000/XP/2003/Vista (virtual COM), SCO OpenServer (RTTY), and Linux/UNIX (GVMODEM).

- Web, Telnet, and Console Configuration:
Offers multiple configuration interfaces—web browser (HTTP), Telnet, or direct console access.

- Linux-Based Embedded System:
Runs a compact Linux OS, allowing SDK-based customization and user-developed applications.

- Rack-Mountable Design:
Standard 1U 19-inch rack form factor suitable for data centers and industrial control environments.

- Firmware Upgradeable:
Supports TFTP-based firmware updates via console or network interface.

- Diagnostic and Monitoring Tools:
Built-in status monitoring for serial port activity, network connectivity, and system parameters.

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### 3. Technical Specifications

Processor: 32-bit MIPS CPU, 100 MHz
Memory: 8 MB Flash ROM, 16 MB SDRAM
Operating System: Embedded Linux

Serial Interfaces:
- 8 × RS-232 ports (RJ45 connectors)
- Baud rate: up to 115,200 bps
- Signal lines: RTS, DTR, TxD, SGND, DSR, RxD, DCD, CTS
- Optional adapter cables:
- GPort502 (RJ45 to DB25 male)
- GPort503 (RJ45 to DB9 male)

Console Port:
- 1 × RS-232 (RJ45 connector)
- Default settings: 115200 bps, 8 data bits, no parity, 1 stop bit, no flow control
- Adapter cable: GPort501 (RJ45 to DB9 female)

Ethernet Interface:
- 1 × 10/100 Mbps Ethernet (RJ45)
- Auto-negotiation for 10/100Base-T
- LED indicators for link and activity

Power Supply:
- Input: 100–240 VAC, 50/60 Hz (switching power supply)
- Power cord included

Physical Dimensions:
- Form factor: 1U, 19-inch rack mountable
- Construction: Metal enclosure
- Weight: Approx. 1.5–2.0 kg (typical for 1U device)

Environmental Conditions:
- Operating temperature: 0°C to 50°C
- Storage temperature: -20°C to 70°C
- Humidity: 10–90% non-condensing

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### 4. Functionality

Operational Concept:
The GPort108 acts as a bridge between serial devices and Ethernet networks. Each serial port can be individually configured to operate in one of several modes, allowing flexible integration into diverse network architectures.

Use Cases:
- Industrial automation systems (PLC, SCADA, sensors)
- POS terminals and kiosks
- Remote serial device management
- Data acquisition and monitoring systems
- Legacy serial equipment network integration

Communication Modes:

1. COM Real TTY Mode:
Creates virtual COM ports on Windows or SCO UNIX systems, allowing legacy serial applications to communicate transparently over IP.

2. GVMODEM Real TTY Mode:
Provides fixed TTY devices on UNIX/Linux systems, mapping each serial port to a pseudo-terminal (e.g., /dev/ttyp1).

3. TCP Server Mode:
The GPort108 listens on assigned TCP ports, accepting incoming connections from clients or Telnet sessions.

4. TCP Client Mode:
The device initiates outbound connections to a specified server IP and port, with options for Telnet negotiation or raw TCP.

5. UDP Mode:
Supports both sending and receiving UDP packets, enabling broadcast to up to four remote hosts.

Configuration Interfaces:
- Web Interface: Accessible via browser (default IP: 192.168.1.254, password: 11111).
- Telnet Interface: Command-line configuration over network.
- Console Interface: Direct serial configuration via console port.

Compatibility:
- Windows NT/2000/XP/2003/Vista (virtual COM driver)
- SCO OpenServer (RTTY driver)
- Linux/UNIX (GVMODEM driver)
- Supports SDK for custom Linux-based applications.

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### 5. Components & Accessories

Included Items:
- GPort108 main unit
- Power cord (100–240 VAC)
- GPort501 RJ45-to-DB9 female console cable
- User manual and software CD (drivers, utilities, SDK)

Optional Accessories:
- GPort502 RJ45-to-DB25 male cable
- GPort503 RJ45-to-DB9 male cable
- Rack-mount brackets (standard 1U)

Connectors:
- RJ45 for serial and Ethernet ports
- Power input socket (IEC type)
- Reset button on front panel
- LED indicators for power, LAN link/activity, and serial TX/RX

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### 6. Installation & Setup

Requirements:
- Ethernet LAN connection (10/100 Mbps)
- Terminal or PC for configuration (via console or web)
- Power source (100–240 VAC)

Installation Steps:
1. Power off the GPort108.
2. Connect the LAN cable to a network hub or switch (default mode: HUB).
3. Connect the console cable to a terminal (115200 bps, 8N1).
4. Connect serial devices to the RS-232 ports using RJ45-to-DB adapters.
5. Power on the device; LEDs indicate link and activity.
6. Access configuration via web (192.168.1.254) or console.
7. Assign static IP, subnet mask, and gateway.
8. Configure each serial port’s mode and parameters.
9. Save settings and restart the device.

Mounting Options:
- Standard 19-inch rack mounting (1U height)
- Desktop placement (rubber feet optional)

Configuration Tools:
- Web browser (HTTP interface)
- Telnet client
- Console terminal (HyperTerminal or equivalent)
- Windows utility “aport_ap.exe” for virtual COM mapping

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### 7. Performance & Capabilities

Serial Communication:
- Baud rate: 300–115,200 bps
- Data bits: 7 or 8
- Stop bits: 1 or 2
- Parity: None, Even, Odd
- Flow control: RTS/CTS, XON/XOFF

Network Performance:
- 10/100 Mbps Ethernet throughput
- Supports simultaneous multi-port communication
- TCP/UDP packet handling optimized for low latency

Capacity:
- Up to 8 concurrent serial sessions
- Supports up to 64 virtual COM ports in Windows environments

Efficiency:
- Embedded Linux OS ensures stable multitasking
- Low power consumption due to MIPS architecture

Limitations:
- Fixed 115.2 kbps maximum serial speed
- Static IP recommended for stable operation
- Limited to 8 serial ports per unit (expandable via multiple units)

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### 8. Standards & Compliance

Electrical & Safety:
- Power input: 100–240 VAC, 50/60 Hz
- Complies with standard electrical safety requirements for IT equipment

Network Standards:
- IEEE 802.3 10Base-T / 100Base-TX
- TCP/IP, UDP/IP, Telnet, DHCP (optional), TFTP

Software & OS Compatibility:
- Windows NT/2000/XP/2003/Vista
- SCO OpenServer UNIX
- Linux distributions (kernel 2.x and above)

Certifications:
- CE and FCC compliance (typical for industrial communication devices)
- RoHS compliant materials

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### 9. Additional Information

Firmware Upgrade:
- Performed via TFTP in firmware upgrade mode (IP: 192.168.1.254)
- Accessible through console or network
- Windows utility: “wftp8.exe”
- Linux/UNIX: standard TFTP client
- Firmware version displayed in system status page

Software Development Kit (SDK):
- Provides cross-compilation tools for MIPS architecture
- Allows creation of custom Linux applications
- Includes compiler suite (mipsel-linux-gcc, strip, ar, ranlib, ld)
- Supports firmware image generation and private key protection

Maintenance & Troubleshooting:
- Power LED indicates operational status
- LAN LEDs show link and speed (10/100 Mbps)
- Serial port LEDs indicate TX/RX activity
- Console output provides Linux boot messages for diagnostics
- Built-in “ping” utility for network verification
- Reset to factory defaults via web interface or hardware reset

Warranty & Support:
- Warranty: 1-year limited warranty covering defects in materials and workmanship
- Exclusions: Damage from misuse, unauthorized servicing, or electrical faults
- Repair Procedure:
- Obtain RMA number from Rayon support (rayon@ms1.hinet.net)
- Provide model, serial number, and fault description
- Return to designated service center
- Out-of-Warranty Repairs: Flat-rate service available upon request

Manufacturer Contact:
Rayon Technology Co., Ltd.
Email: [rayon@ms1.hinet.net](mailto:rayon@ms1.hinet.net)
Website: [www.rayontech.com](http://www.rayontech.com)

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### Summary

The GPort108 IP Serial Server is a robust, Linux-based multi-port serial-to-Ethernet communication device engineered for industrial and enterprise environments requiring reliable serial-over-IP connectivity. With eight RS-232 ports, flexible configuration modes, and cross-platform driver support, it enables seamless integration of legacy serial equipment into modern TCP/IP networks. Its embedded Linux OS, SDK support, and firmware upgradeability make it both a ready-to-deploy communication server and a customizable development platform. The 1U rack-mountable design, comprehensive driver suite, and multi-interface configuration options position the GPort108 as a versatile solution for industrial automation, remote device management, and serial data networking applications.