User's Manual

MHX-900 Operating Manual: Chapter 1 Introduction. 1

1. Introduction

1.0 Product Overview

Congratulations on choosing the MHX-900 wireless modem module! Your

new MHX-900 modem is a state-of-the-art, 900 MHz frequency-hopping

spread-spectrum communications transceiver module. When the MHX-900

module is incorporated into the design of new or existing equipment, terminal

devices (DTEs) up to 30 km (or more)

apart will be capable of establishing

high-speed

communications wirelessly.

MHX-900 modules provide a practical and reliable alternative to using

traditional analog phone-line modems or “permanent wire” serial cable

(RS-232) connections for data communications between terminal equipment.

Moreover, wireless data communications using the MHX-900 module means

you will benefit from:

n greater flexibility and freedom to relocate terminal equipment,

n eliminated requirement for access to wire-based transfer media

such as telephone lines,

n the ability to communicate through walls, floors, and many

other obstacles.

While the MHX-900 module is compact in its design, it delivers power and

convenience and offers quality and dependability. The MHX-900 module’s

versatility makes it the ideal solution for applications ranging from office-

productivity to industrial data control and acquisition.

While a pair of MHX-900 modules can link two terminal devices (“point-to-

point” operation), multiple MHX-900 modules can be used together to create

a network of various topologies (“point-to-multipoint” operation). Multiple

independent networks can operate concurrently, so it is possible for unrelated

communications operations to take place in the same or a nearby area without

sacrificing privacy, functionality, or reliability.

1.1 Features

Key features of the MHX-900 module include:

n transmission within a public, license-exempt band of the radio

spectrum

– this means there are no conditions on usage of the

MHX-900 module, and that it can be used without restrictions

or access fees (such as those incurred by cellular airtime);

n a serial I/O data port (TTL levels) with handshaking and

hardware flow control, allowing the MHX-900 module to inter-

face directly to any microprocessor with an asynchronous serial

interface.

Ideal conditions with clear line-of-sight communications, using high-gain antennas.

Up to 115,200 bits per second (bps).

902-928 MHz, which is license-free within North America; may need to be factory-configured

differently for some countries.