Comprehensive Product Summary: Moxa NPort Server Lite DE‑332 Ethernet to RS‑485/RS‑422 2‑Port Device Server

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### 1. Product Overview

Product Name: NPort Server Lite
Model: DE‑332
Series: NPort Server Lite Family
Article Number: DE‑332
Manufacturer: Moxa Technologies Co., Ltd. (Taiwan)

Product Description:
The Moxa NPort Server Lite DE‑332 is a compact, dual‑port Ethernet‑to‑serial device server designed to connect RS‑485 or RS‑422 serial devices to a 10/100 Mb Ethernet network. It enables transparent data communication between serial and Ethernet interfaces, allowing legacy serial equipment to be integrated into modern TCP/IP networks. The DE‑332 is part of Moxa’s NPort family, which includes the NPort Express, NPort Server Lite, and NPort Server Pro product lines.

Intended Use:
The DE‑332 is ideal for industrial automation, building management, and remote monitoring applications where serial devices such as PLCs, sensors, or controllers must be accessed over Ethernet networks.

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### 2. Key Features

- Dual Serial Ports: Two independent RS‑485/RS‑422 ports for simultaneous device connections.
- Ethernet Interface: 10/100 Mb auto‑detect Ethernet port with RJ‑45 connector.
- High‑Performance CPU: 16‑bit embedded processor for efficient protocol handling.
- Memory: 512 KB RAM for buffering and firmware operation.
- Flexible Baud Rate: Supports serial communication speeds from 50 bps to 230.4 kbps.
- Multiple Operation Modes:
- Host‑Based / Driver Mode (Real COM / Real TTY)
- Pair Connection Mode
- TCP Server / TCP Client
- UDP Server / Client
- Cross‑Platform Driver Support:
- Windows 95/98/ME/NT/2000/XP Real COM drivers
- Linux Real TTY and fixed TTY drivers
- Data Packing Function: Configurable delimiters and force‑transmit timers for optimized packetization.
- Access Control: IP‑based access management by server or port.
- Easy Configuration:
- NPort Management Suite (Windows GUI)
- Telnet Console
- ARP command configuration
- Firmware Upgradeable: Supports remote firmware updates via Configurator utility.
- Compact Design: Small form factor for DIN‑rail or panel mounting.
- Power Supply: 230 VAC external power adapter included.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Model | DE‑332 |
| CPU | 16‑bit embedded processor |
| Memory | 512 KB RAM |
| Ethernet Interface | 10/100 Mb auto‑detect, RJ‑45 connector |
| Serial Interface | 2 × RS‑485/RS‑422 ports (DB9 female) |
| Baud Rate | 50 bps – 230.4 kbps |
| Serial Signals (RS‑422) | TxD+, TxD−, RxD+, RxD− |
| Serial Signals (RS‑485) | Data+, Data− |
| Flow Control | XON/XOFF, RTS/CTS (software/hardware selectable) |
| Dimensions | 155 mm × 105 mm × 33 mm |
| Weight | Approx. 0.4 kg (typical) |
| Power Supply | 230 VAC external adapter |
| Operating Temperature | 0 °C – 55 °C (typical) |
| Storage Temperature | −20 °C – 70 °C |
| Humidity | 5 % – 95 % RH (non‑condensing) |
| Mounting | Desktop, wall, or DIN‑rail (optional kit) |
| Default IP Address | 192.168.127.254 |
| MAC Address | Factory‑assigned unique 48‑bit identifier |
| Enclosure Material | Metal housing for EMI protection |
| LED Indicators | Power, Ethernet Link/Activity, Serial Tx/Rx |

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### 4. Functionality

Operational Concept:
The DE‑332 acts as a transparent bridge between Ethernet and serial networks. It encapsulates serial data into TCP/IP packets for transmission over Ethernet and decapsulates received packets back into serial data streams.

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 over Ethernet without modification.
- Supports up to 128 ports per Windows 9x/ME host and 256 ports per Windows NT/2000/XP host.

2. Pair Connection Mode:
- Two NPorts form a virtual serial cable over Ethernet.
- Extends serial communication distance beyond RS‑232 limits (up to LAN/WAN range).

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

4. TCP Client Mode:
- Actively initiates TCP connections to a defined remote host and port.
- Can connect automatically at startup or upon serial activity.

5. UDP Server/Client Mode:
- Enables fast, connectionless data transmission.
- Supports multicast/broadcast to multiple hosts.

Applications:
- Industrial automation (PLC, HMI, SCADA integration)
- Building automation (HVAC, access control)
- Remote data acquisition and monitoring
- Serial device networking (barcode scanners, sensors, meters)
- Legacy system Ethernet migration

Compatibility:
- Compatible with Moxa Real COM and Real TTY drivers.
- Works with standard TCP/IP socket applications.
- Supports Windows and Linux operating systems.

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### 5. Components & Accessories

Included Items:
- NPort Server Lite DE‑332 main unit
- 230 VAC external power adapter
- Quick installation guide and documentation
- Software CD containing NPort Management Suite and drivers

Optional Accessories:
- DIN‑rail mounting kit
- Wall‑mount brackets
- RS‑485/RS‑422 wiring adapters
- Replacement power supply

Connectors:
- Ethernet: RJ‑45 (10/100 Mb auto‑MDI/MDI‑X)
- Serial: 2 × DB9 female connectors (RS‑485/RS‑422)
- Power: Barrel‑type DC input jack (for external adapter)

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### 6. Installation & Setup

Network Configuration:
- Default IP: 192.168.127.254
- Configuration methods:
- NPort Management Suite (recommended)
- ARP command (for same‑LAN setup)
- Telnet Console (VT100 interface)

IP Assignment Options:
- Static IP
- DHCP
- DHCP/BOOTP

Software Tools:
- NPort Management Suite (Windows GUI)
- Configurator (search, modify, import/export, firmware upgrade)
- Real COM Installer (COM port mapping)
- NPort Monitor (port status monitoring)
- NPort Batch Configurator (mass configuration for Windows/Linux)

Installation Steps:
1. Connect DE‑332 to Ethernet and power.
2. Assign IP address using Configurator or ARP.
3. Install NPort Management Suite on host PC.
4. Use Real COM Installer to map virtual COM ports.
5. Configure serial parameters (baud rate, parity, stop bits, flow control).
6. Verify communication using NPort Monitor or terminal emulator.

Mounting Options:
- Desktop placement
- Wall mounting via screw holes
- DIN‑rail mounting with optional bracket

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### 7. Performance & Capabilities

| Parameter | Capability |
|----------------|----------------|
| Serial Speed | 50 bps – 230.4 kbps |
| Ethernet Speed | 10/100 Mb auto‑detect |
| Max. Connections | Multiple TCP/UDP sessions per port |
| Data Packing | Configurable delimiters (hex) and force‑transmit timer (1–65535 ms) |
| TCP Alive Check | 1–99 min timeout or disabled |
| Inactivity Timeout | 1–65535 ms configurable |
| Buffering | Internal 512 KB RAM for data buffering |
| Throughput | Optimized for low‑latency serial‑to‑Ethernet conversion |
| Reliability | Automatic reconnection and watchdog mechanisms |
| Limitations | No RS‑232 interface; limited to RS‑485/RS‑422 signaling |

Performance Notes:
- Supports simultaneous bidirectional data transfer.
- “Fast Flush” driver option improves response time for applications using PurgeComm() in Windows.
- Supports up to 1 KB automatic packetization threshold.
- Multiple hosts can share access to the same NPort under controlled access rules.

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### 8. Standards & Compliance

Networking Standards:
- IEEE 802.3 10Base‑T
- IEEE 802.3u 100Base‑TX
- TCP/IP, UDP, ARP, ICMP, DHCP, BOOTP protocols

Serial Standards:
- EIA RS‑485 / RS‑422 electrical specifications

Software & Driver Compliance:
- Windows 95/98/ME/NT/2000/XP Real COM driver
- Linux Real TTY and fixed TTY driver support

Regulatory Compliance:
- CE and FCC Class A (typical for Moxa industrial networking devices)
- RoHS compliant (for later production runs)

Industry Standards:
- Compatible with Modbus RTU over TCP/IP implementations
- Supports standard Telnet configuration interface

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### 9. Additional Information

Warranty:
Typically 3 years limited hardware warranty (as per Moxa standard policy).

Technical Support:
- Email: support@moxa.com.tw
- Website: [https://www.moxa.com](https://www.moxa.com)
- Online resources include driver downloads, firmware updates, and manuals.

Maintenance:
- Periodic firmware updates via Configurator utility.
- Configuration backup and restore using export/import functions.
- Regular inspection of power and network connections recommended.

Firmware Upgrades:
- Performed through NPort Management Suite (Configurator → Upgrade Firmware).
- Supports batch firmware updates for multiple devices of the same model.

Software Updates:
- Latest drivers and utilities available from Moxa’s website.
- Linux utilities distributed as `npbc.tgz` package for batch configuration.

Documentation:
- NPort Family Software Installation Guide (Fourth Edition, May 2004).
- Includes detailed configuration, operation modes, and troubleshooting procedures.

Revision History Highlights:
- Major revision (Nov 2002): unified installation suite, renamed utilities, added Data Packing.
- Update (May 2004): new Moxa logo, added “Fast Flush” driver function.

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### Summary

The Moxa NPort Server Lite DE‑332 is a robust, dual‑port Ethernet‑to‑RS‑485/RS‑422 device server engineered for industrial and commercial networking of serial equipment. With its 16‑bit CPU, 512 KB RAM, and support for multiple communication modes, it provides flexible integration of serial devices into Ethernet infrastructures. The DE‑332’s comprehensive software suite simplifies configuration, monitoring, and maintenance, while its compact, durable design ensures reliable operation in demanding environments.

By supporting both Windows and Linux platforms, offering advanced data‑packing and access‑control features, and maintaining compatibility with standard TCP/IP protocols, the DE‑332 remains a versatile solution for extending the life and connectivity of legacy serial systems in modern networked applications.