Adcon A720 Guía de usuario descargar pdf (Pagina 14)

CHAPTER 2

System Setup

Installation

The base station has two main components: an indoor unit (the

A840) and an outdoor unit (the A440).

Before proceeding with the installation, take a moment to plan

your network. First, it is essential to realize the importance of

selecting a good location for the base station. You must consider

several factors, some of them quite contradictory, when you select

this location:

• From a radio perspective, the height of the receiving antenna

is essential: the higher the antenna, the greater the range of

communication. For the GSM operated RTUs this is not an

issue, but you must make sure you have good on-site

coverage from your cellular provider.

• The base station should be situated in the same building

where the people managing the base station work, or at least

spend some of their time.

• Places like cellars, near heat sources, or damp locations are

not suitable.

• Geographically it is better to have the base station in the

center of the area where the RTUs will be installed (this does

not apply to A733GSM/GPRS stations).

• If you plan to use the base station as a server to allow other

people to log in and get data, be sure that a telephone line is

available exclusively for this use.

• Adcon also recommends that you have a telephone

connection next to the PC for when you need technical

support.

The communication distance you can achieve is directly

proportional to the height of the receiving antenna. The

propagation mode of the waves the Adcon system uses is basically

the line of sight. Due to the curvature of the earth, on flat terrain,

the maximum distance reached depends on the height of the

receiver and of the measuring stations’ antennas. You can’t do

much on the remote station side, but you have more options with

the base station. Some typical examples of the achieved distances,

under various conditions, are shown in Table 1.

The addIT RTU, however, uses low-power technology and was not

designed to communicate over large distances. The typical “line-of

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Adcon A720 Guía de usuario Pagina 14