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Telemetry Applications
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News:
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| GPRS |
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 New to GSM is the 'General Packet
Radio Service', or GPRS.
GPRS is an 'always on' technology which means
you are able to have a virtual connection all of the time, transferring data
only when required, rather than having to make a specific call to connect to a
service as in a normal data (Circuit Switched Data) mode.
A key use for
GPRS is to send and receive data between devices such as telemetry (telemetry
refers to devices not being controlled by humans such as outstations or RTU's).
To use GPRS the service is 'dialled' in a similar manner to a standard
data call (though there is no phone no.) at which point the user is 'attached'
and an IP address is allocated. From then on data can flow to and from the
public domain (Internet) or private domain until either the network unattaches
the device (maybe because of a time-out, fault or congestion) or it is down
manually. This is where Dynamic Logics expertise of communication in remote
harsh conditions comes in. We have implemented the GPRS feature within a number
of our outstations (see suitable products) to ensure communication continues in
the most severe of conditions and if it should become unattached from the
network our solution will connect the outstation back to the network
automatically. However if you only want to connect to the network when a
problem needs reporting, then our outstations can be configured to do so!
 Our latest D7000 range
goes one step further with the use of GPRS. As standard our FSK protocol is
used however as the user is charged on the amount of date transferred rather
than the time taken to do so. We have produced a 'GPRS binary protocol' which
reduces the transfer protocol to a minimum ensuring only the minimum amount of
data is transmitted over the GPRS network. This should result in monthly
charges reducing for the user!
The maximum speed of a gprs network is
171.2 kilobits per second, about 3 times as fast as data transmission speeds
over fixed telecommunication networks and 10 times as fast as current GSM
networks. This will allow data information to be transmitted more quickly for
high volume data users and should result in a more cost effective way of
transmitting data. No dial-up modem connection is necessary so information can
be sent and received immediately hence the term 'always connected'.
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