Moxa Technologies 331 User Manual download pdf (Page 6)

Moxa C Programmable RTU Controllers Introduction

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Overview

The Moxa C programmable RTU controller uses the Moxa ART RISC CPU. The RISC architecture and advanced

semiconductor technology provide the RTU controller with a powerful computing engine and communication

functions without generating a lot of heat. A 32 MB NOR Flash ROM, 64 MB on-board SDRAM, and an SD socket

provide enough memory for you to install application software and store data directly on the RTU controller. In

addition, the cellular modem, the Ethernet switch ports, and 3-in-1 serial interfaces create the best flexibility

to communicate with field devices and with the central host, making the Moxa C programmable RTU controller

ideal for remote data acquisition and industrial control applications.

The pre-installed operating system (OS) provides an open operating system for your software program

development. Software that runs on desktop PCs can be easily exported to the RTU controller with a cross

compiler. The software development package also provides versatile API functions, such as I/Os and

communication control, SCADA connection, alarms, and Modbus communication.

Software Architecture

The operating system that is pre-installed in the Moxa C programmable RTU controller follows a standard

Linux-based architecture; the program porting can be done with the Tool Chain 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 Moxa C programmable 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 Moxa C programmable 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.

For more information about the memory map and programming, refer to Chapter 6, Programmer’s Guide.

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Moxa Technologies 331 User Manual Page 6