Shandong USR IOT Technology Limited USRGM3 User Manuals

Table of Contents

• USR-GM3/GM3s User Guide

  1
• Quick Start

  3
• 1.1. Testing environment

  3
• 1.2. Transmission

  4
• 2. Introduction

  6
• 2.1. Short Description

  6
• 2.2. Characteristic

  6
• 2.3. Features

  6
• 2.4. Application Field

  7
• 3. Hardware

  8
• 3.1. Pin Description

  8
• 3.1.1. Outside View

  8
• 3.1.2. Pin Assignment（Top）

  8
• 3.1.3. PCB Layout

  8
• 3.1.4. Pin Description

  9
• 3.1.5. Outside Antenna

  11
• 3.2. Hardware Block Diagram

  11
• 4. Module Functions

  11
• 4.1. Work Mode

  12
• 4.1.1. Switching Work Mode

  12
• 4.1.2. Network transmission

  12
• 4.1.3. HTTPD Function

  20
• 4.1.4. SMS Message Transmission

  23
• 4.2. Register Package

  27
• 4.2.1. Description

  28
• 4.2.2. Usage

  28
• 4.3. Heart Beat Package

  29
• 4.3.1. Description

  30
• 4.3.2. Usage

  30
• 4.4. UART

  31
• 4.4.1. RS485

  32
• 4.4.2. Similar RFC2217

  32
• 5. Parameters Setting

  33
• 5.1. Operating AT command

  34
• 5.2. AT Command Format

  35
• 5.3. AT Command Set

  37
• Appendix A: Contact

  54
• Appendix B: Disclaimer

  55
• Appendix C: Update History

  55