---
title: "WIZnet Port Module Series Selection Guide"
url: "https://maker.wiznet.io/ronpang/projects/wiznet-port-module-series-selection-guide/"
markdown_url: "https://maker.wiznet.io/ronpang/projects/wiznet-port-module-series-selection-guide/md"
type: "WCC: WIZnet Created Content"
author: "ronpang"
author_url: "https://maker.wiznet.io/ronpang/"
published: "2026-01-23"
language: "en"
likes: 0
views: 905
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# WIZnet Port Module Series Selection Guide

> WIZnet 5 port modules convert serial to Ethernet with encryption, dual ports, and cost-effective options for industrial to IoT applications.

## Article

## Preface

This article focuses on WIZnet's 5 core port modules (WIZ-IP32, WIZ-IP20, WIZ-IP75, WIZ-IP55, WIZ-IP51S). Each model has its own emphasis on interface specifications, speed performance, and functional configurations, covering full-dimensional needs from basic serial-to-Ethernet scenarios to high-speed communication scenarios and multi-protocol compatibility scenarios. They meet diverse hardware design requirements from low-cost embedded devices to industrial-grade high-speed networking terminals, helping users quickly identify suitable solutions and reduce selection and development costs.

![](https://maker.wiznet.io/upload/ckeditor5/419353359%5F1769191614%2Epng)

## Core Features of Each Module

### WIZ-IP32

ARM Cortex-M3, integrates TCP/IP + MAC + PHY

Dual serial ports, baud rate supports up to 1.152Mbps

Supports Keep Alive, password authentication, Modbus protocol

**Applications**: Dual-PLC gateways, multi-channel temperature/humidity collection terminals, dual-device data synchronization gateways

### WIZ-IP20

Dual ARM Cortex-M0+, integrates TCP/IP + MAC + PHY

Supports encrypted protocols like HTTPS, MQTTS

**Applications**: Encrypted cloud gateways, financial security devices, safe remote monitoring systems

### WIZ-IP75

ARM Cortex-M0, integrates TCP/IP + MAC + PHY

Cost-effective, supports three configuration methods and 2048-byte dual buffer

**Applications**: Home smart lock gateways, civilian temperature/humidity collection modules, small building lighting controllers

### WIZ-IP55

8 Sockets + SPI high-speed interface, integrates TCP/IP + MAC + PHY

Integrated network port and protocol stack in single package

**Applications**: Industrial precision pressure measurement and control terminals, machine tool PLC cluster gateways, automation testing instrument networking modules

### WIZ-IP51S

4 Sockets + SPI high-speed interface, integrates TCP/IP + MAC + PHY

Integrated network port and protocol stack in single package, cost-effective

**Applications**: Low-power IoT sensor gateways, portable smart monitoring terminals, miniature embedded data acquisition modules

## Quick Selection Guide

| Decision Dimension | Criteria | Recommended Models |
| --- | --- | --- |
| Communication Performance | Need high-speed serial port? | WIZ-IP32 |
| Protocol Compatibility | Need encryption/multiple IoT protocols? | WIZ-IP20 |
| Interface & Flow Control | Need dual serial ports? | WIZ-IP32 |
| Cost-effectiveness | Low-cost, lightweight networking needs? | WIZ-IP75 |
| Rapid Integration | Need to connect with other MCUs for quick Ethernet access? | WIZ-IP55, WIZ-IP51S |

## Core Parameters & Feature Comparison Table

| **Model** | **Core Configuration** | **Key Features** | **Typical Applications** |
| --- | --- | --- | --- |
| WIZ-IP32 | Cortex-M3, dual serial ports, hardware TCP/IP | Dual serial port transmission, full Modbus support, industrial grade | Power/chemical/metallurgy automation gateways |
| WIZ-IP20 | W55RP20 chip, supports encrypted communication | Encrypted communication, OTA, full-link security | Medical/financial/government encrypted cloud gateways |
| WIZ-IP75 | Cortex-M0, serial port with flow control | Cost-effective, stable without redundancy | Smart buildings/civilian industrial control gateways |
| WIZ-IP55 | W5500, 8 Sockets, SPI | High-speed concurrency, easy embedded development | Precision manufacturing/industrial inspection controllers |
| WIZ-IP51S | W5100S, 4 Sockets, SPI | Low cost, energy efficient, compact package | IoT low-power nodes/mass production modules |

## Common Selection Q&A

**Q1: What are the core advantages of network offload modules?**
A1: They integrate chips, network transformers, and RJ45 connectors, enabling plug-and-play operation without additional Ethernet circuit design. This simplifies hardware development while leveraging hardware TCP/IP protocol stacks to enhance communication stability, making them suitable for rapidly implementing networking requirements.

**Q2: What scenarios are serial port flow control functions suitable for?**
A2: When serial port data transmission rates are high and data volumes are large, CTS/RTS flow control can coordinate the timing between transmitter and receiver to prevent data loss. This is commonly used in industrial high-speed serial port devices and large-volume continuous transmission scenarios.

**Q3: Are encrypted protocols (SSL/MQTTS) necessary to choose?**
A3: For public network transmission and scenarios involving sensitive data (such as medical, financial, or security data), encrypted protocols can ensure data transmission security and prevent theft or tampering.

**Q4: What is the relationship between Socket quantity and concurrent communication?**
A4: The number of Sockets determines how many simultaneous network connections the module can establish. 8 Sockets are suitable for multi-device/multi-server concurrent connections, while 4 Sockets meet single-connection or limited concurrent scenarios. Selection should be based on the actual networking architecture.

**Q5: What is the core value of dual-serial port design?**
A5: Dual serial ports enable simultaneous connection of multiple devices without requiring additional interface expansion. Combined with high baud rates up to 1.152Mbps, they can meet parallel transmission requirements for multi-channel data, making them suitable for dual-PLC gateways, multi-node data collection, and similar scenarios.

## Typical Application Case References

**WIZ-IP32**: Factory production line dual-PLC gateway (dual serial ports for multi-device access + industrial-grade stability + Modbus compatibility)

**WIZ-IP20**: Financial security encrypted cloud gateway (MQTTS encrypted communication + OTA upgrade + multi-protocol adaptation, ensuring sensitive data security)

**WIZ-IP75**: Smart building low-cost data collection module (cost-effective + serial port flow control, suitable for civilian batch applications)

**WIZ-IP55**: Precision manufacturing measurement and control terminal networking module (high concurrency + plug-and-play + industrial wide temperature range, shortening development cycles)

**WIZ-IP51S**: IoT low-power sensor gateway (energy-saving mode + compact package + low cost, suitable for batch low-power nodes)

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Source: https://maker.wiznet.io/ronpang/projects/wiznet-port-module-series-selection-guide/