Microhard Systems MHX-900, Руководство по эксплуатации

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MHX-900 Operating Manual: Chapter 1 Introduction.
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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)
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apart will be capable of establishing
high-speed
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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,
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eliminated requirement for access to wire-based transfer media
such as telephone lines,
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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:
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transmission within a public, license-exempt band of the radio
spectrum
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– 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.
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Ideal conditions with clear line-of-sight communications, using high-gain antennas.
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Up to 115,200 bits per second (bps).
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902-928 MHz, which is license-free within North America; may need to be factory-configured
differently for some countries.