Transcript turkey awos training 1.0 / alanya 2005

TURKEY AWOS TRAINING 1.0 / ALANYA 2005
TRAINING COURSE ON
AUTOMATED WEATHER OBSERVING SYSTEMS
( AWOS )
MODULE C.2: COMMUNICATION
SONER KARATAŞ
ELECTRONIC OBSERVING SYTEMS DIVISION
TURKISH STATE METEOROLOGICAL SERVICE
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
INTRODUCTION
 Communication between DCU and local station
 Real Time
 Cabled Communication
 Wireless Communication
 Off-Line
 Memory Card
 Communication between local station and remote centre
 Cabled Communication
 Wireless Communication
 Communication between DCU and remote centre
 Cabled Communication
 Wireless Communication
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Communication between DCU and
local station
Communication between DCU and local
station can be separeted as
•
Real Time Communication
•
Off-line communication.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Real Time Communication
• A station providing data to users of
meteorological observations in real time,
typically at programmed times, but also in
emergency conditions or upon external
request.
• Typical real-time uses would be the
provision of data for synoptic use and the
monitoring of critical warning states such
as storms, river, or tide levels.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Cabled Communication
•
RS232
•
RS485
•
Short Haul Modem
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
RS232
• The RS-232C standard is an
asynchronous serial communication
method for distances up to 15ft.
• Serial means that the information is sent
1-bit at a time.
• Asynchronous means that the information
isn't sent at predefined time slots (like with
a fixed clock, for instance).
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
RS232
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
RS485
• RS485 standard is an asynchronous serial
communication method for distances up to
4000ft.
• An RS-485 network can be connected in a 2 or 4
wire mode.
• Maximum cable length can be as much as 4000
feet because of the differential voltage
transmission system used.
• The RS232 may be converted to RS485 with a
simple interface converter.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
RS485 CONNECTION
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Short Haul Modem
• Short haul modems are cheap solutions to
systems of short ranges (up to 15 km),
which use private lines and are not part of
a public system.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Short Haul Modem
• Short haul modems are distance-sensitive,
because signal attenuation occurs as the
signal travels through the line.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Short Haul Modem
• The transmission rate must be lowered to
ensure consistent and error-free
transmission on longer distances.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Wireless Communication
• Wireless communication system has a number
of advantages.
• It is a simple matter to relocate a communicating
device, and no additional cost of rewiring and
excessive downtime is associated with such a
move.
• It is also a simple matter to add in a
communication device to the system or remove
one from the system without any disruption to
the remainder of the system.
• The cost of running and maintaining a radio
based communications solution is minimal.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Radio Modem
•
•
•
Radio modems encode, transmit and
decode the data.
They use radio waves for data
transmission.
And this medium of transmission gives
user a lot of advantage over the wired
data transfer.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Radio Modem
There are three stages of communication:
• Data encoding: Transmitting radio modem takes
data from the source system and encodes it
• Data transmission: Once encoded, the
transmitting radio modem transmits the encoded
data as radio waves with certain pre-defined
frequency.
• Data Reception: The receiving radio modem
receives the radio waves transmitted on the predefined frequency (like our radio instrument),
decodes the data to its original format and
provides it to the connected device
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Radio Modem
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Off-Line Communication
• Off-line AWOS: A station recording data on
site on internal or external data storage
devices eventually combined with a
display of actual data.
• The intervention of an observer is
required to send stored data to the remote
data user. Typical stations are
climatological and simple aid to the
observer stations.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Memory Card
• Data can be downloaded from datalogger
to memory card.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Memory Card
• After pulling data, data can be easily
transfer to main PC with using memory car
reader.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Communication between local
station and remote centre
• Communication between local station and
remote centre can be separeted as Cabled
Communication and Wireless Communication.
• Main difference between local station- remote
centre and DCU-local station is the distance.
• Distance between local station and remote
centre increases respect to between DCU and
local station.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Cabled Communication
•
Dial up Modem
•
Leased Line Modem
•
Internet Network ( TCP / IP )
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Dial up Modem
• Dial-up modems can establish point-to-point
connections on the public switched telephone
network ( PSTN ) by any combination of manual
or automatic dialing or answering.
• The quality of the circuit is not guaranteed, but
all phone companies establish objectives. The
links established are almost always 2-wire
because 4-wire dialing is tedious and expensive.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Leased Line Modem
• Leased, private or dedicated lines (usually 4wire) are for the exclusive use of "leasedline" modems - either pair (in a simple pointto-point connection) or several (on a
multidrop network contention) system
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Internet Network ( TCP / IP )
• Transmission Control Protocol/Internet
Protocol (TCP/IP) is a set of protocols or
rules developed to allow cooperating
computers to share resources across a
network.
• Data is given from local station to remote
centre using direct connection to TCP / IP
network
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Internet Network ( TCP / IP )
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Wireless Communication
• Global System for Mobile Communication
(GSM )
• Satellite
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Global System for Mobile
Communication (GSM )
• Global system for mobile communication
(GSM) is a globally accepted standard for
digital cellular communication.
• GSM system is optional data communication
system .
• The GSM system is ideal when VHF/UHF
data transmission is not possible due to
unattainable line of sight between the radio
transmitter and receiver.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Global System for Mobile
Communication (GSM )
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Satellite
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Satellite
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Communication between DCU and
remote centre
Communication between DCU and remote
centre can be separeted as
• Cabled Communication
• Wireless Communication
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Cabled Communication
•
Dial-Up Modem
•
Leased Line Modem
•
Internet Network (TCP / IP )
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Dial-Up Modem
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Leased Line Modem
• Leased, private or dedicated lines (usually
4-wire) are for the exclusive use of
"leased-line" modems - either pair (in a
simple point-to-point connection) or
several (on a multidrop network )
contention system.
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Internet Network (TCP / IP )
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Wireless Communication
• Global System for Mobile Communication
(GSM )
• Satellite
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Global System for Mobile
Communication (GSM )
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
Satellite
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
CONCLUSION
 Communication between DCU and local station
 Real Time
 Cabled Communication
 Wireless Communication
 Off-Line
 Memory Card
 Communication between local station and remote centre
 Cabled Communication
 Wireless Communication
 Communication between DCU and remote centre
 Cabled Communication
 Wireless Communication
TURKEY AWOS TRAINING 1.0 / ALANYA 2005
THANKS
THANK YOU FOR YOUR PATIENT
AND YOUR ATTENDANCE
DO YOU HAVE ANY QUESTION ?
Soner Karataş
[email protected]
TURKEY AWOS TRAINING 1.0 / ALANYA 2005