Moxa Technologies 331 User Manual download pdf (Page 6)

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UC-7112-LX Plus Software User’s Manual Introduction

1-2

Overview

The UC-7112-LX Plus uses a Moxa ART ARM9 192 Mhz RISC CPU. Unlike the X86 CPU,

which uses a CISC design, the RISC architecture and modern semiconductor technology provide

these embedded computers with a powerful computing engine and communication functions, but

without generating a lot of heat. A 16 MB NOR Flash ROM and on-board 32 MB SDRAM give

you enough memory to install your application software directly on the embedded computer. In

addition, dual LAN ports are built right into the RISC CPU. This network capability, in

combination with the ability to control serial devices, makes the UC-7112-LX Plus ideal as a

communication platform for data acquisition and industrial control applications.

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

your software program development. The UC-7112-LX Plus uses Linux kernel version 2.6 with

MMU support (Memory Management Unit). Software written for desktop PCs can be easily ported

to the computer with a GNU cross compiler, without needing to modify the source code. The OS,

device drivers (e.g., serial and buzzer control), and your own applications, can all be stored in the

NOR Flash memory.

Software Architecture

The Linux operating system that is pre-installed in the UC-7112-LX Plus follows the standard

Linux architecture, making it easy to accept programs that follow the POSIX standard. Program

porting is done with the GNU Tool Chain provided by Moxa. In addition to Standard POSIX APIs,

device drivers for the SD control buzzers, Network controls, and UART are also included in the

Linux OS.

API

Protocol

Stack

Device

Driver

Microkernel

User Application

Daemon (Apache, Telnet, FTPD, SNMP)

Application Interface (POSIX, Socket, Secure Socket)

TCP, IP, UDP, CMP, ARP, HTTP, SNMP, SMTP

PCMCIA, CF, WLAN, USB, UART, RTC, LCM, Keypad

Memory control, Schedule, Process

RS-232/422/485, Ethernet, PCMCIA, CompactFlash, USB

File

System

Hardware

lenreK SO

The UC-7112-LX Plus’s built-in Flash ROM is partitioned into Boot Loader, Linux Kernel,

Root File System, and User directory partitions.

In order to prevent user applications from crashing the Root File System, the UC-7112-LX Plus

uses a specially designed 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. The user directory saves the user’s settings and application.

To improve system reliability, the UC-7112-LX Plus has a built-in mechanism that prevents the

system from crashing. When the Linux kernel boots up, the kernel will mount the root file system

for read only, and then enable services and daemons. At the same time, the kernel will start

searching for system configuration parameters with rc or inittab.

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