Comprehensive Product Summary: Moxa NPort Express Module DE‑311M

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### 1. Product Overview

Product Name: NPort Express Module
Model: DE‑311M
Series: NPort Express Family (part of the Moxa NPort Family)
Article Number: DE‑311M
Manufacturer: Moxa Technologies Co., Ltd.

Product Type: Ethernet to RS‑232/422/485 1‑Port Server Module
Description: The Moxa NPort DE‑311M is a compact embedded device server module that enables any RS‑232, RS‑422, or RS‑485 serial device to connect directly to a 10/100 Mb Ethernet network. It provides a single serial port interface and is designed for OEM integration or embedded applications requiring reliable serial‑to‑Ethernet connectivity.

Physical Dimensions: 57 × 90 × 18 mm
Manufacturer Origin: Moxa Technologies Co., Ltd., a global leader in industrial networking and serial connectivity solutions.

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### 2. Key Features

- Multi‑Protocol Serial Interface: Supports RS‑232, RS‑422, and RS‑485 communication standards through a single configurable port.
- Ethernet Connectivity: 10/100 Mb Ethernet interface via RJ‑45 connector for flexible network integration.
- Embedded CPU: Intel 80186 CPU for stable, deterministic performance in embedded environments.
- Memory: 512 KB RAM for efficient data buffering and protocol handling.
- Flexible Serial Configuration: Supports baud rates up to 230.4 Kbps, with selectable parity, stop bits, and data bits (note: configuration allows 2 stop bits with no parity).
- Compact Module Design: Small footprint (57 × 90 × 18 mm) suitable for OEM integration into industrial controllers, PLCs, or embedded systems.
- Multiple Operation Modes:
- Host‑Based / Driver Mode (Real COM / Real TTY)
- Pair Connection Mode
- TCP Server / TCP Client
- UDP Server/Client
- Ethernet Modem Mode (for legacy systems)
- Cross‑Platform Driver Support:
- Windows 95/98/ME/NT/2000/XP Real COM driver
- Linux fixed TTY and Real TTY drivers
- Data Packing Function: Configurable delimiters and force‑transmit timers for optimized packetization.
- Access Control: IP‑based access control by server or port for secure host management.
- Firmware Upgradeable: Supports remote firmware updates via NPort Management Suite.
- Software Suite: Bundled with Moxa NPort Management Suite for configuration, monitoring, and batch management.
- Industrial Reliability: Designed for continuous operation in industrial and embedded environments.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Model | DE‑311M |
| CPU | Intel 80186 |
| Memory | 512 KB RAM |
| Ethernet Interface | 10/100 Mb Ethernet, RJ‑45 connector |
| Serial Interface | RS‑232/422/485, DB9 female connector |
| Serial Communication Speed | Up to 230.4 Kbps |
| Supported Serial Parameters | Data Bits: 5–8 bits; Stop Bits: 1 or 2; Parity: None, Even, Odd (2 stop bits + no parity supported) |
| Dimensions | 57 × 90 × 18 mm |
| Weight | Lightweight embedded module (approx. < 100 g) |
| Power Requirements | 5 V DC typical (OEM integration dependent) |
| Operating Temperature | 0 – 55 °C (typical for embedded modules) |
| Storage Temperature | –20 – 85 °C |
| Humidity | 5 – 95 % RH (non‑condensing) |
| Default IP Address | 192.168.127.254 |
| MAC Address | Factory‑assigned unique 48‑bit identifier |
| Network Protocols | TCP, UDP, ARP, DHCP, BootP, Telnet |
| Compliance | CE, FCC Class A (typical for Moxa NPort series) |
| Mounting | Embedded/OEM integration; PCB or chassis mount |
| Enclosure Material | OEM module (metal or PCB‑mounted, depending on integration) |

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### 4. Functionality

The DE‑311M functions as a 1‑port serial‑to‑Ethernet device server, bridging traditional serial devices to modern Ethernet networks. It encapsulates serial data into TCP/IP packets, enabling remote access, monitoring, and control of serial equipment over LAN or WAN.

Operation Modes:

1. Host‑Based / Driver Mode (Real COM / Real TTY):
- Creates a virtual COM port on the host PC.
- Allows 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.

2. Pair Connection Mode:
- Two DE‑311M units form a virtual serial cable over Ethernet.
- Extends RS‑232/422/485 communication beyond 15 m.
- Transparent data and control signal transmission (except DCD).

3. TCP Server Mode:
- Waits for incoming TCP connections from clients.
- Configurable TCP port (default 4001).
- Optional destination IP restriction for secure access.

4. TCP Client Mode:
- Actively initiates a TCP connection to a remote host.
- Configurable destination IP and port.
- Supports auto‑connect on power‑up or on serial activity.

5. UDP Server/Client Mode:
- Enables high‑speed, connectionless data transmission.
- Supports multicast/broadcast to multiple hosts.
- Configurable destination and source IP filters.

6. Ethernet Modem Mode:
- Emulates a dial‑up modem for legacy systems (e.g., MS‑DOS).
- Uses AT commands (ATD, ATA, ATH, ATZ, etc.) and S‑registers for control.
- Replaces phone numbers with IP addresses for Ethernet “dial‑out.”

Typical Applications:
- Industrial automation and control systems
- PLC and CNC machine networking
- Remote data acquisition and SCADA integration
- POS terminals and barcode scanners
- Embedded OEM systems requiring Ethernet connectivity
- Legacy system modernization (Ethernet modem replacement)

Compatibility:
- Windows 95/98/ME/NT/2000/XP (Real COM driver)
- Linux (fixed TTY and Real TTY drivers)
- Compatible with Moxa PComm Lite Serial Control Library

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### 5. Components & Accessories

Included Components:
- DE‑311M module (main unit)
- RJ‑45 Ethernet interface
- DB9 female serial connector
- Firmware pre‑installed with default configuration
- Software CD or downloadable NPort Management Suite

Optional Accessories:
- Power supply (if used standalone)
- Serial cable (DB9 male/female)
- Cross‑over Ethernet cable for direct PC connection
- Mounting hardware for OEM integration
- PComm Lite software (free download)

Connectors:
- Ethernet: RJ‑45, 10/100 Mb auto‑negotiation
- Serial: DB9 female, RS‑232/422/485 selectable

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### 6. Installation & Setup

Requirements:
- Ethernet network (LAN/WAN) or direct cross‑over cable connection
- Host PC with Windows or Linux OS
- Administrative access for IP configuration

Initial Configuration:
- Factory default IP: 192.168.127.254
- Configuration methods:
- NPort Management Suite (recommended)
- ARP command (for local LAN setup)
- Telnet Console (VT100 terminal)
- Serial Console (19200 bps, 8‑N‑1)

Setup Steps:
1. Connect DE‑311M to the network via RJ‑45.
2. Assign a static or dynamic IP (DHCP/BootP supported).
3. Configure serial parameters (baud rate, parity, stop bits).
4. Select operation mode (Host‑Based, TCP, UDP, Pair, Ethernet Modem).
5. Save and restart to apply settings.

Mounting Options:
- Embedded PCB integration
- DIN‑rail or panel mounting (via OEM housing)

Software Tools:
- NPort Management Suite:
- Configurator (GUI for setup and firmware updates)
- Real COM Installer (COM port mapping)
- NPort Monitor (port monitoring)
- NPort Batch Configurator (mass configuration)

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### 7. Performance & Capabilities

| Parameter | Capability |
|----------------|----------------|
| Serial Speed | Up to 230.4 Kbps |
| Ethernet Speed | 10/100 Mb auto‑negotiation |
| Data Throughput | Optimized via data packing and force‑transmit timers |
| Latency | Low‑latency serial‑to‑Ethernet conversion |
| Connection Capacity | 1 serial port per module; multiple modules manageable via suite |
| Driver Support | Windows Real COM, Linux Real TTY |
| Data Packing Options | Delimiter 1/2 (hex), Force Transmit (ms) |
| TCP Alive Check | 1–99 min timeout configurable |
| Inactivity Timeout | 1–65535 ms |
| Reliability | Continuous operation with watchdog and buffer management |
| Limitations | Single port; DCD signal not transmitted in Pair Mode |

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### 8. Standards & Compliance

- Network Standards: IEEE 802.3 10/100 Base‑T Ethernet
- Serial Standards: RS‑232 / RS‑422 / RS‑485 EIA specifications
- Protocols Supported: TCP, UDP, ARP, DHCP, BootP, Telnet
- Software Standards: Windows COM port API, Linux TTY interface
- Regulatory Compliance:
- CE Mark (EMC Directive 89/336/EEC)
- FCC Part 15 Class A
- RoHS compliant (typical for Moxa modules)
- Industry Standards:
- ISO 9001 manufacturing
- Compatible with industrial automation and SCADA systems

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### 9. Additional Information

Warranty:
Standard Moxa warranty (typically 5 years) covering manufacturing defects and firmware support.

Technical Support:
- Email: support@moxa.com.tw
- Website: [https://www.moxa.com](https://www.moxa.com)
- Online resources: drivers, firmware, manuals, and knowledge base

Maintenance:
- Firmware upgrades via NPort Configurator or Telnet
- Configuration backup and restore via Export/Import functions
- Periodic verification of network and serial parameters recommended

Firmware Updates:
- Upgradeable through NPort Management Suite (Configurator → Upgrade Firmware)
- Supports batch firmware updates for multiple NPorts

Software Utilities Overview:
- Configurator: GUI for locating, configuring, and upgrading NPorts.
- Real COM Installer: Maps virtual COM ports to NPort serial ports.
- NPort Monitor: Monitors port activity and connection status.
- NPort Batch Configurator: Command‑line tool for mass configuration (Windows npbc.exe / Linux npbc.tgz).

Access Control & Security:
- IP‑based access control (by server or port).
- Password protection for configuration access.
- Configurable via Configurator or Telnet Console.

Firmware Configuration Parameters:
- Server Model: DE‑311M (factory set)
- IP Configuration: Static, DHCP, DHCP/BootP, BootP
- Ethernet Status: 10 Mb or 100 Mb link indication
- Gateway and Netmask: User‑configurable
- Console Password: Optional for security

Serial Configuration Options:
- Baud Rate: 50 – 230.4 Kbps
- Data Bits: 5 – 8
- Stop Bits: 1 or 2
- Parity: None, Even, Odd
- Flow Control: RTS/CTS, XON/XOFF, None
- UART FIFO: Enable/Disable

Advanced Driver Features:
- Fast Flush Option: Improves response time for applications using Win32 PurgeComm() function.
- Transmission Modes: Hi‑Performance (default) and Classical (for guaranteed data delivery).

AT Command Support (Ethernet Modem Mode):
- Standard commands: ATA, ATD, ATH, ATZ, ATE, AT&C, AT&D, AT&F, AT&W, etc.
- S‑Registers for timing and control (e.g., S0 auto‑answer, S2 escape character, S12 guard time).

Revision History Highlights:
- Edition 3 (2002): Major revision introducing Host Based / Driver Mode and Data Packing.
- Edition 4 (May 2004): Updated Moxa logo and added “Fast Flush” function description.

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### Summary

The Moxa NPort DE‑311M is a robust, single‑port Ethernet‑to‑serial server module engineered for embedded and industrial applications requiring reliable serial‑to‑Ethernet conversion. With its Intel 80186 CPU, 512 KB RAM, and support for RS‑232/422/485 interfaces, it delivers high‑performance data communication over 10/100 Mb Ethernet networks.

Its comprehensive operation modes—ranging from Host‑Based Driver Mode to Ethernet Modem Mode—make it suitable for a wide range of applications, including industrial automation, remote monitoring, and legacy system integration. The included NPort Management Suite simplifies installation, configuration, and maintenance, while firmware upgrade capabilities ensure long‑term support and scalability.

With its compact form factor, cross‑platform driver support, and industrial‑grade reliability, the DE‑311M remains a versatile solution for OEMs and system integrators seeking to network‑enable serial devices efficiently and securely.