Campbell csi mAXON, Инструкция по эксплуатации

Страница: 7 / 74

1-1
Section 1. General Radiotelemetry
Network
1.1 Introduction
Data retrieval from a remote site can be difficult. To accomplish data
collection from isolated sites Campbell Scientific, Inc. utilizes a radiotelemetry
(RF telemetry) network. Dataloggers can be accessed by RF telemetry which
requires no physical connection from the computer to the datalogger. The RF
telemetry link reduces the number of visits to a remote site for data collection.
The RF telemetry network is designed for complete computer control. One
computer can establish communication with up to 254 remote sites. PC208W
Datalogger Support Software allows data collection from the datalogger,
transmitting datalogger programs, and displaying current readings from the
datalogger.
The requirements specific to a RF telemetry network include:
•
The distance between radio stations should not be greater than
approximately 25 miles.
•
The stations should not have major obstacles between them; therefore, they
should be within line-of-sight of each other.
The stations communicate over a radio frequency which is specified in
Megahertz (MHz, 148 to 174 MHz and 440 to 470 MHz are supported). A
data communication network must have its own specific frequency to prevent
interference from other sources. Typical radio frequencies are either VHF
(Very High Frequency) ranging from 148 to 174 MHz or UHF (Ultra High
Frequency) ranging from 440 to 470 MHz. A typical RF system is shown in
Figure 1-1.
Telemetry network’s three basic components are:
•
Field Station
•
Base Station
•
Repeater Station
This manual covers the use of the RF310 and RF312 radios, the RF310M radio
modem and the RF310B base station. Some PC208W software topics are also
addressed.