Moxa ioPAC 5542-C-T — настройка и конфигурация RTU: Полное руководство для пользователей [6/52]

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ioPAC RTU Software Introduction

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Overview

This section introduces the scope of this document and lists related documents for reference.

Scope

The purpose of this document is to help users set up and configure the ioPAC RTU and become familiar with the

programming environment quickly. The following topics are covered in this document:

 Introduction

 Getting Started

 RTU Management

 RTU Communications

 RTU Data Acquisition

 RTU Programming

The following information is provided in the Appendix:

 System Commands

Related Documents

Additional information about ioPAC RTU features is available in the following manuals, which can be found in

the ioPAC RTU Documentation & Software CD.

 ioPAC 8500 RTU Hardware User’s Manual

 C/C++ Sample Code Programming Guide for ioPAC RTU Controllers

Supported Products

 ioPAC 8500 Series

 ioPAC 5500 Series

Software Architecture

The ioPAC RTU controller uses an ARM9 based industrial grade CPU for the system and ARM Cortex™ M4 based

CPUs for the modules. It provides up to 10 MB Flash ROM, 64 MB on-board SDRAM, and a microSD socket (up

to 32 MB) for users to install application software and to store data directly on the controller.

The pre-installed operating system (OS) provides an open platform for software program development, which

follows a standard Linux-based architecture. Software that runs on desktop PCs can be easily exported to the

RTU controller with a cross compiler. Program porting can be done with the toolchain provided by Moxa.

The built-in flash ROM is partitioned into Boot Loader, Kernel, Root File System, and User directory partitions.

In order to prevent user applications from crashing the Root File System, the RTU controller uses a unique Root

File System with Protected Configuration for emergency use. This Root File System comes with serial and

Ethernet communication capability for users to load the Factory Default Image file. User settings and

applications are saved in the user directory.

To improve system reliability, the RTU controller has a built-in mechanism that prevents the system from

crashing. When the kernel boots up, the RTU will mount the root file system in read-only mode, and then enable

services and daemons. At the same time, the kernel will start searching for system configuration parameters

via rc or inittab.

Normally, the kernel uses the Root File System to boot up the system. The Root File System is protected, and

cannot be changed by users, which creates a safe zone for users.