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- Ethernet to Serial Conversion: Converts RS‑485/RS‑422 serial data to Ethernet TCP/IP for remote access and control.
- Single‑Port Design: One DB9 female serial port supporting RS‑485 or RS‑422 communication.
- Auto‑Detect Ethernet Interface: 10/100 Mb Ethernet with RJ45 connector, supporting auto‑negotiation.
- High‑Performance Embedded CPU: 16‑bit CPU with 512 KB RAM for stable and efficient data handling.
- Wide Baud Rate Range: Supports serial communication speeds from 50 bps up to 230.4 kbps.
- Multiple Operation Modes: Host Based/Driver Mode, Pair Connection Mode, TCP Server, TCP Client, and UDP Server/Client.
- Real COM and Real TTY Drivers: Provides transparent COM port or TTY device mapping for Windows and Linux hosts.
- Flexible IP Configuration: Supports Static IP, DHCP, DHCP/BOOTP, and BOOTP addressing.
- Advanced Access Control: IP‑based access control by server or by port for secure communication.
- Data Packing Function: Configurable delimiters and force‑transmit timers to optimize data transmission efficiency.
- Firmware Upgradeable: Supports remote firmware updates via NPort Management Suite.
- Compact Industrial Design: Rugged metal enclosure suitable for industrial environments.
- Power Supply: Operates from 230 VAC external power adapter (included).
- Single‑Port Design: One DB9 female serial port supporting RS‑485 or RS‑422 communication.
- Auto‑Detect Ethernet Interface: 10/100 Mb Ethernet with RJ45 connector, supporting auto‑negotiation.
- High‑Performance Embedded CPU: 16‑bit CPU with 512 KB RAM for stable and efficient data handling.
- Wide Baud Rate Range: Supports serial communication speeds from 50 bps up to 230.4 kbps.
- Multiple Operation Modes: Host Based/Driver Mode, Pair Connection Mode, TCP Server, TCP Client, and UDP Server/Client.
- Real COM and Real TTY Drivers: Provides transparent COM port or TTY device mapping for Windows and Linux hosts.
- Flexible IP Configuration: Supports Static IP, DHCP, DHCP/BOOTP, and BOOTP addressing.
- Advanced Access Control: IP‑based access control by server or by port for secure communication.
- Data Packing Function: Configurable delimiters and force‑transmit timers to optimize data transmission efficiency.
- Firmware Upgradeable: Supports remote firmware updates via NPort Management Suite.
- Compact Industrial Design: Rugged metal enclosure suitable for industrial environments.
- Power Supply: Operates from 230 VAC external power adapter (included).
Comprehensive Product Summary: Moxa NPort Server Lite DE‑331 Ethernet to RS‑485/RS‑422 Device Server
*(Approx. 3000 tokens / ~12,000 characters)*
### 1. Product Overview
Product Name: NPort Server Lite DE‑331
Model Number: DE‑331
Series: NPort Server Lite Family
Article Number: DE‑331
Manufacturer: Moxa Technologies Co., Ltd. (Taipei, Taiwan)
Product Type: Ethernet to RS‑485/RS‑422 1‑Port Device Server
Description: The Moxa NPort Server Lite DE‑331 is a compact, single‑port serial device server that enables RS‑485 or RS‑422 serial devices to connect to a 10/100 Mb Ethernet network. It provides transparent data transmission between serial and Ethernet interfaces, allowing legacy serial equipment to be integrated into modern TCP/IP networks.
Intended Use: Industrial automation, remote serial device management, SCADA systems, building automation, and any application requiring Ethernet‑based access to serial devices.
### 2. Key Features
- Ethernet to Serial Conversion: Converts RS‑485/RS‑422 serial data to Ethernet TCP/IP for remote access and control.
- Single‑Port Design: One DB9 female serial port supporting RS‑485 or RS‑422 communication.
- Auto‑Detect Ethernet Interface: 10/100 Mb Ethernet with RJ45 connector, supporting auto‑negotiation.
- High‑Performance Embedded CPU: 16‑bit CPU with 512 KB RAM for stable and efficient data handling.
- Wide Baud Rate Range: Supports serial communication speeds from 50 bps up to 230.4 kbps.
- Multiple Operation Modes: Host Based/Driver Mode, Pair Connection Mode, TCP Server, TCP Client, and UDP Server/Client.
- Real COM and Real TTY Drivers: Provides transparent COM port or TTY device mapping for Windows and Linux hosts.
- Flexible IP Configuration: Supports Static IP, DHCP, DHCP/BOOTP, and BOOTP addressing.
- Advanced Access Control: IP‑based access control by server or by port for secure communication.
- Data Packing Function: Configurable delimiters and force‑transmit timers to optimize data transmission efficiency.
- Firmware Upgradeable: Supports remote firmware updates via NPort Management Suite.
- Compact Industrial Design: Rugged metal enclosure suitable for industrial environments.
- Power Supply: Operates from 230 VAC external power adapter (included).
### 3. Technical Specifications
Physical Characteristics
- Dimensions: 155 mm (W) × 105 mm (D) × 33 mm (H)
- Weight: Approx. 0.5 kg (typical)
- Housing Material: Metal enclosure for EMI protection and durability
- Mounting Options: Desktop placement or wall mounting (optional brackets)
Interfaces
- Ethernet Port: 1 × RJ45, 10/100 Mb, auto‑detect, full/half duplex
- Serial Port: 1 × DB9 female connector, RS‑485/RS‑422 selectable
- Serial Communication Parameters:
- Baud Rate: 50 bps to 230.4 kbps
- Data Bits: 5, 6, 7, 8
- Stop Bits: 1, 1.5, 2
- Parity: None, Even, Odd, Space, Mark
- Flow Control: RTS/CTS, XON/XOFF, or None
- UART FIFO: Enable/Disable selectable
Performance
- CPU: 16‑bit embedded processor
- Memory: 512 KB RAM
- Throughput: Up to 230.4 kbps per port
- Latency: Typically <10 ms under standard Ethernet conditions
Power Requirements
- Input Voltage: 230 VAC (via external power adapter)
- Power Consumption: <5 W typical
Environmental
- Operating Temperature: 0 °C to 55 °C
- Storage Temperature: −20 °C to 85 °C
- Humidity: 5 % to 95 % RH (non‑condensing)
### 4. Functionality
Operational Concept:
The DE‑331 acts as a bridge between Ethernet and serial communication. It encapsulates serial data into TCP/IP packets for transmission over Ethernet and decapsulates received packets back into serial data.
Supported Operation Modes:
1. Host Based / Driver Mode:
- Creates virtual COM ports on Windows or TTY devices on Linux.
- Enables legacy serial applications to communicate transparently over Ethernet.
- Supports up to 128 ports on Windows 95/98/ME and 256 ports on Windows NT/2000/XP hosts.
2. Pair Connection Mode:
- Two DE‑331 units form a serial tunnel over Ethernet, extending serial communication beyond RS‑485/RS‑422 distance limits.
- Transparent data and modem control signal transfer (except DCD).
3. TCP Server Mode:
- Waits for incoming TCP connections from remote clients.
- Configurable TCP port (default 4001).
- Optional destination IP restriction for secure access.
4. TCP Client Mode:
- Actively initiates TCP connections to a specified remote host and port.
- Supports automatic connection on power‑up or upon serial activity.
5. UDP Server/Client Mode:
- Enables fast, connectionless data transmission.
- Supports multicast and broadcast communication.
Compatibility:
- Operating Systems: Windows 95/98/ME/NT/2000/XP, Linux (Real TTY driver).
- Protocols: TCP, UDP, IP, ARP, ICMP, DHCP, BOOTP.
- Software Tools: NPort Management Suite, Real COM Installer, NPort Monitor, NPort Batch Configurator.
Applications:
- Remote monitoring of PLCs, sensors, and controllers.
- Integration of serial‑based instruments into Ethernet networks.
- Industrial automation, building management, and SCADA systems.
- Serial‑to‑Ethernet data acquisition and control.
### 5. Components & Accessories
Included Items:
- NPort Server Lite DE‑331 main unit
- External 230 VAC power adapter
- Quick installation guide and documentation
- Software CD containing NPort Management Suite and drivers
Optional Accessories:
- Wall‑mounting brackets
- DIN‑rail mounting kit (if applicable)
- RS‑485/RS‑422 wiring adapters or terminal blocks
- Ethernet crossover cable for direct PC connection
Connectors:
- Ethernet: RJ45, 8‑pin
- Serial: DB9 female (RS‑485/RS‑422)
- Power: Barrel‑type DC input from external adapter
### 6. Installation & Setup
Network Configuration:
- Factory Default IP Address: 192.168.127.254
- Configuration Methods:
- NPort Management Suite (recommended)
- ARP command and Telnet console
- Serial console (for NPort Express models; DE‑331 uses network setup)
IP Address Assignment:
- Static IP or Dynamic IP (DHCP/BOOTP).
- Supports MAC‑based IP mapping for DHCP servers.
Software Installation:
- Install NPort Management Suite via `Dssetup.exe`.
- Components include Configurator, Real COM Installer, NPort Monitor, and Batch Configurator.
Configurator Functions:
- Broadcast Search and Search by IP Address
- Modify Configuration (IP, Netmask, Gateway, Serial Settings)
- Export/Import Configuration
- Firmware Upgrade
- Unlock Server (password management)
Real COM Installer:
- Maps NPort serial ports to host COM ports.
- Supports Add Server Wizard and COM number reassignment.
- Provides “Fast Flush” option for improved performance with PurgeComm() API calls.
Mounting & Power:
- Connect Ethernet cable to RJ45 port.
- Connect serial device to DB9 port.
- Apply power via included 230 VAC adapter.
- Verify link and activity LEDs for network status.
### 7. Performance & Capabilities
Data Transmission:
- Baud rates from 50 bps to 230.4 kbps.
- Supports full‑duplex RS‑422 and half‑duplex RS‑485 modes.
- Configurable data packing using delimiters or force‑transmit timers (1–65535 ms).
Network Throughput:
- Optimized for low‑latency serial‑to‑Ethernet conversion.
- TCP alive check time configurable (1–99 minutes).
- Inactivity timeout for automatic connection closure.
Driver Performance:
- Real COM driver for Windows and Real TTY driver for Linux provide transparent serial communication.
- “Fast Flush” function reduces latency when using PurgeComm() in Windows applications.
Limitations:
- Single serial port (1 × RS‑485/RS‑422).
- No built‑in serial console (configuration via Ethernet only).
- DCD signal not transmitted in Pair Connection Mode.
### 8. Standards & Compliance
Network Standards:
- IEEE 802.3 10Base‑T / 100Base‑TX Ethernet
- TCP/IP, UDP, ARP, ICMP, DHCP, BOOTP protocols
Serial Standards:
- EIA/TIA‑485 and EIA/TIA‑422 compliant
Software & Driver Standards:
- Windows Real COM driver (Windows 95/98/ME/NT/2000/XP)
- Linux Real TTY driver (kernel‑compatible versions)
Regulatory Compliance:
- CE and FCC Class A (industrial environment)
- RoHS compliant (depending on production batch)
Industry Standards Supported:
- Transparent serial tunneling over TCP/IP
- Virtual COM port emulation
- Secure IP‑based access control
### 9. Additional Information
Warranty:
- Standard Moxa limited warranty (typically 3 years) covering hardware defects under normal use.
Technical Support:
- Email: support@moxa.com.tw
- Website: [https://www.moxa.com](https://www.moxa.com)
- Online resources include driver downloads, firmware updates, and user manuals.
Maintenance:
- Periodic firmware updates via NPort Management Suite.
- Configuration backup and restore using Export/Import functions.
- Regular verification of network and serial connections recommended.
Firmware Configuration Parameters:
- Server Configuration: IP address, Netmask, Gateway, MAC address, Password.
- Serial Settings: Baud rate, parity, data bits, stop bits, flow control, FIFO.
- Access Control: Grant access by IP or by port.
- Operation Mode Parameters:
- TCP/UDP ports, destination IPs, delimiters, force transmit timers, inactivity timers.
Software Utilities Overview:
- Configurator: GUI for configuration and firmware management.
- Real COM Installer: Maps serial ports to COM numbers.
- NPort Monitor: Monitors port activity and status.
- NPort Batch Configurator: Command‑line tool for mass configuration (Windows: `npbc.exe`, Linux: `npbc.tgz`).
Firmware Upgrade Process:
- Performed via Configurator using *.ROM firmware files.
- Supports simultaneous upgrade of multiple devices of the same model.
Security & Access:
- Password protection for configuration access.
- IP‑based access control lists.
- Configurable lock/unlock states for servers.
Revision History Highlights:
- Edition 3 (Nov 15 2002): Major revision introducing unified NPort Management Suite and Host Based/Driver Mode.
- Edition 4 (May 12 2004): Added “Fast Flush” function and updated Moxa branding.
### Summary
The Moxa NPort Server Lite DE‑331 is a robust, single‑port Ethernet‑to‑RS‑485/RS‑422 device server designed to integrate serial devices into Ethernet networks with minimal configuration. Featuring a 16‑bit CPU, 512 KB RAM, and support for multiple communication modes, it provides reliable, transparent serial data transmission over TCP/IP. Its comprehensive software suite—NPort Management Suite—simplifies installation, configuration, and maintenance across Windows and Linux environments.
With industrial‑grade construction, flexible IP configuration, and advanced access control, the DE‑331 is ideal for industrial automation, remote monitoring, and legacy system integration where dependable serial‑to‑Ethernet connectivity is required.
*(Approx. 3000 tokens / ~12,000 characters)*
### 1. Product Overview
Product Name: NPort Server Lite DE‑331
Model Number: DE‑331
Series: NPort Server Lite Family
Article Number: DE‑331
Manufacturer: Moxa Technologies Co., Ltd. (Taipei, Taiwan)
Product Type: Ethernet to RS‑485/RS‑422 1‑Port Device Server
Description: The Moxa NPort Server Lite DE‑331 is a compact, single‑port serial device server that enables RS‑485 or RS‑422 serial devices to connect to a 10/100 Mb Ethernet network. It provides transparent data transmission between serial and Ethernet interfaces, allowing legacy serial equipment to be integrated into modern TCP/IP networks.
Intended Use: Industrial automation, remote serial device management, SCADA systems, building automation, and any application requiring Ethernet‑based access to serial devices.
### 2. Key Features
- Ethernet to Serial Conversion: Converts RS‑485/RS‑422 serial data to Ethernet TCP/IP for remote access and control.
- Single‑Port Design: One DB9 female serial port supporting RS‑485 or RS‑422 communication.
- Auto‑Detect Ethernet Interface: 10/100 Mb Ethernet with RJ45 connector, supporting auto‑negotiation.
- High‑Performance Embedded CPU: 16‑bit CPU with 512 KB RAM for stable and efficient data handling.
- Wide Baud Rate Range: Supports serial communication speeds from 50 bps up to 230.4 kbps.
- Multiple Operation Modes: Host Based/Driver Mode, Pair Connection Mode, TCP Server, TCP Client, and UDP Server/Client.
- Real COM and Real TTY Drivers: Provides transparent COM port or TTY device mapping for Windows and Linux hosts.
- Flexible IP Configuration: Supports Static IP, DHCP, DHCP/BOOTP, and BOOTP addressing.
- Advanced Access Control: IP‑based access control by server or by port for secure communication.
- Data Packing Function: Configurable delimiters and force‑transmit timers to optimize data transmission efficiency.
- Firmware Upgradeable: Supports remote firmware updates via NPort Management Suite.
- Compact Industrial Design: Rugged metal enclosure suitable for industrial environments.
- Power Supply: Operates from 230 VAC external power adapter (included).
### 3. Technical Specifications
Physical Characteristics
- Dimensions: 155 mm (W) × 105 mm (D) × 33 mm (H)
- Weight: Approx. 0.5 kg (typical)
- Housing Material: Metal enclosure for EMI protection and durability
- Mounting Options: Desktop placement or wall mounting (optional brackets)
Interfaces
- Ethernet Port: 1 × RJ45, 10/100 Mb, auto‑detect, full/half duplex
- Serial Port: 1 × DB9 female connector, RS‑485/RS‑422 selectable
- Serial Communication Parameters:
- Baud Rate: 50 bps to 230.4 kbps
- Data Bits: 5, 6, 7, 8
- Stop Bits: 1, 1.5, 2
- Parity: None, Even, Odd, Space, Mark
- Flow Control: RTS/CTS, XON/XOFF, or None
- UART FIFO: Enable/Disable selectable
Performance
- CPU: 16‑bit embedded processor
- Memory: 512 KB RAM
- Throughput: Up to 230.4 kbps per port
- Latency: Typically <10 ms under standard Ethernet conditions
Power Requirements
- Input Voltage: 230 VAC (via external power adapter)
- Power Consumption: <5 W typical
Environmental
- Operating Temperature: 0 °C to 55 °C
- Storage Temperature: −20 °C to 85 °C
- Humidity: 5 % to 95 % RH (non‑condensing)
### 4. Functionality
Operational Concept:
The DE‑331 acts as a bridge between Ethernet and serial communication. It encapsulates serial data into TCP/IP packets for transmission over Ethernet and decapsulates received packets back into serial data.
Supported Operation Modes:
1. Host Based / Driver Mode:
- Creates virtual COM ports on Windows or TTY devices on Linux.
- Enables legacy serial applications to communicate transparently over Ethernet.
- Supports up to 128 ports on Windows 95/98/ME and 256 ports on Windows NT/2000/XP hosts.
2. Pair Connection Mode:
- Two DE‑331 units form a serial tunnel over Ethernet, extending serial communication beyond RS‑485/RS‑422 distance limits.
- Transparent data and modem control signal transfer (except DCD).
3. TCP Server Mode:
- Waits for incoming TCP connections from remote clients.
- Configurable TCP port (default 4001).
- Optional destination IP restriction for secure access.
4. TCP Client Mode:
- Actively initiates TCP connections to a specified remote host and port.
- Supports automatic connection on power‑up or upon serial activity.
5. UDP Server/Client Mode:
- Enables fast, connectionless data transmission.
- Supports multicast and broadcast communication.
Compatibility:
- Operating Systems: Windows 95/98/ME/NT/2000/XP, Linux (Real TTY driver).
- Protocols: TCP, UDP, IP, ARP, ICMP, DHCP, BOOTP.
- Software Tools: NPort Management Suite, Real COM Installer, NPort Monitor, NPort Batch Configurator.
Applications:
- Remote monitoring of PLCs, sensors, and controllers.
- Integration of serial‑based instruments into Ethernet networks.
- Industrial automation, building management, and SCADA systems.
- Serial‑to‑Ethernet data acquisition and control.
### 5. Components & Accessories
Included Items:
- NPort Server Lite DE‑331 main unit
- External 230 VAC power adapter
- Quick installation guide and documentation
- Software CD containing NPort Management Suite and drivers
Optional Accessories:
- Wall‑mounting brackets
- DIN‑rail mounting kit (if applicable)
- RS‑485/RS‑422 wiring adapters or terminal blocks
- Ethernet crossover cable for direct PC connection
Connectors:
- Ethernet: RJ45, 8‑pin
- Serial: DB9 female (RS‑485/RS‑422)
- Power: Barrel‑type DC input from external adapter
### 6. Installation & Setup
Network Configuration:
- Factory Default IP Address: 192.168.127.254
- Configuration Methods:
- NPort Management Suite (recommended)
- ARP command and Telnet console
- Serial console (for NPort Express models; DE‑331 uses network setup)
IP Address Assignment:
- Static IP or Dynamic IP (DHCP/BOOTP).
- Supports MAC‑based IP mapping for DHCP servers.
Software Installation:
- Install NPort Management Suite via `Dssetup.exe`.
- Components include Configurator, Real COM Installer, NPort Monitor, and Batch Configurator.
Configurator Functions:
- Broadcast Search and Search by IP Address
- Modify Configuration (IP, Netmask, Gateway, Serial Settings)
- Export/Import Configuration
- Firmware Upgrade
- Unlock Server (password management)
Real COM Installer:
- Maps NPort serial ports to host COM ports.
- Supports Add Server Wizard and COM number reassignment.
- Provides “Fast Flush” option for improved performance with PurgeComm() API calls.
Mounting & Power:
- Connect Ethernet cable to RJ45 port.
- Connect serial device to DB9 port.
- Apply power via included 230 VAC adapter.
- Verify link and activity LEDs for network status.
### 7. Performance & Capabilities
Data Transmission:
- Baud rates from 50 bps to 230.4 kbps.
- Supports full‑duplex RS‑422 and half‑duplex RS‑485 modes.
- Configurable data packing using delimiters or force‑transmit timers (1–65535 ms).
Network Throughput:
- Optimized for low‑latency serial‑to‑Ethernet conversion.
- TCP alive check time configurable (1–99 minutes).
- Inactivity timeout for automatic connection closure.
Driver Performance:
- Real COM driver for Windows and Real TTY driver for Linux provide transparent serial communication.
- “Fast Flush” function reduces latency when using PurgeComm() in Windows applications.
Limitations:
- Single serial port (1 × RS‑485/RS‑422).
- No built‑in serial console (configuration via Ethernet only).
- DCD signal not transmitted in Pair Connection Mode.
### 8. Standards & Compliance
Network Standards:
- IEEE 802.3 10Base‑T / 100Base‑TX Ethernet
- TCP/IP, UDP, ARP, ICMP, DHCP, BOOTP protocols
Serial Standards:
- EIA/TIA‑485 and EIA/TIA‑422 compliant
Software & Driver Standards:
- Windows Real COM driver (Windows 95/98/ME/NT/2000/XP)
- Linux Real TTY driver (kernel‑compatible versions)
Regulatory Compliance:
- CE and FCC Class A (industrial environment)
- RoHS compliant (depending on production batch)
Industry Standards Supported:
- Transparent serial tunneling over TCP/IP
- Virtual COM port emulation
- Secure IP‑based access control
### 9. Additional Information
Warranty:
- Standard Moxa limited warranty (typically 3 years) covering hardware defects under normal use.
Technical Support:
- Email: support@moxa.com.tw
- Website: [https://www.moxa.com](https://www.moxa.com)
- Online resources include driver downloads, firmware updates, and user manuals.
Maintenance:
- Periodic firmware updates via NPort Management Suite.
- Configuration backup and restore using Export/Import functions.
- Regular verification of network and serial connections recommended.
Firmware Configuration Parameters:
- Server Configuration: IP address, Netmask, Gateway, MAC address, Password.
- Serial Settings: Baud rate, parity, data bits, stop bits, flow control, FIFO.
- Access Control: Grant access by IP or by port.
- Operation Mode Parameters:
- TCP/UDP ports, destination IPs, delimiters, force transmit timers, inactivity timers.
Software Utilities Overview:
- Configurator: GUI for configuration and firmware management.
- Real COM Installer: Maps serial ports to COM numbers.
- NPort Monitor: Monitors port activity and status.
- NPort Batch Configurator: Command‑line tool for mass configuration (Windows: `npbc.exe`, Linux: `npbc.tgz`).
Firmware Upgrade Process:
- Performed via Configurator using *.ROM firmware files.
- Supports simultaneous upgrade of multiple devices of the same model.
Security & Access:
- Password protection for configuration access.
- IP‑based access control lists.
- Configurable lock/unlock states for servers.
Revision History Highlights:
- Edition 3 (Nov 15 2002): Major revision introducing unified NPort Management Suite and Host Based/Driver Mode.
- Edition 4 (May 12 2004): Added “Fast Flush” function and updated Moxa branding.
### Summary
The Moxa NPort Server Lite DE‑331 is a robust, single‑port Ethernet‑to‑RS‑485/RS‑422 device server designed to integrate serial devices into Ethernet networks with minimal configuration. Featuring a 16‑bit CPU, 512 KB RAM, and support for multiple communication modes, it provides reliable, transparent serial data transmission over TCP/IP. Its comprehensive software suite—NPort Management Suite—simplifies installation, configuration, and maintenance across Windows and Linux environments.
With industrial‑grade construction, flexible IP configuration, and advanced access control, the DE‑331 is ideal for industrial automation, remote monitoring, and legacy system integration where dependable serial‑to‑Ethernet connectivity is required.
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NPort_Software_Guide_4.pdf
Manual
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