Endress+Hauser Fieldgate FXA520, Operating Instructions Manual

Page: 15 / 108

Fieldgate FXA520 3 Function and System Design
Hauser 13
3.2.3 Mobile communications network (GSM)
The GSM modem allows data to be transferred via a mobile communications network. It can be
configured as point-to-point connections or as freely accessible via the Internet/Intranet. A SIM
card from a mobile communications network operator is required for GSM operation.
Communication is established via the data channel of the SIM card, which may require additional
activation, depending on the GSM provider.
Fig. 3-5: Connecting Fieldgate to a mobile communications network
3.2.4 GPRS support
GPRS (General Packet Radio Services) is a mobile communications technique, which exploits the
advantages of packet-oriented data transmission and channel bundling.
In contrast to normal GSM connections, no complete channel is reserved for the duration of the
connection between the mobile device and the basis station, rather the data are compiled into
packets, which can be sent depending on requirement and capacity. Data transmission in packets
enables not only greater transmission rates but also permanent dial-in operation. The Fieldgate is
thus permanently in a position to connect to the Internet, an Intranet or a mailbox, whereby data
are only transferred as required, e.g. if a new e-mail is sent or a new Internet page is called up. In
this case, you are only charged for the amount of data actually transmitted and not for connection
time.
The GPRS mode of the Fieldgate GSM thus offers the easiest and most cost-effective option for
connecting a measuring point permanently to the Internet or an Intranet. Permanent dial-in allows
optimal use of Fieldgate’s web page functions, providing Internet access via WAP or HTML and PC.
To use some GPRS functions, e.g. access to the Fieldgate via Internet, the GSM/GPRS provider will
need to allocate a public IP address. It will be necessary to determine in each individual case,
whether this additional service is offered by the respective operator.
WWW
Fieldgate FXA 520
PSTN (Public Switched Telephone Network)
SIM
Card