Westermo GD-01 - Manual (Page 2)

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Introduction
Wireless data communication links over a GSM network can be used instead of normal
wirebound communication in several industrial data communication applications. The
benefits of wireless applications are many and one of the most obvious is the low cost of
the installation. Other important benefits are for example all services provides by the
GSM networks. The data transfer service is just one of many that could be used in a lot
of different industrial data communication applications.
The Westermo GD-series of modems provides a reliable data communication link over
GSM networks. The modems has been designed for use in industrial data communication
applications and has several features that are normally not present on standard GSM
modems. The GD-xx series of GSM modems is available in two versions: the GD-01 and
the GD-02. The GD-01 is a DIN-rail mounted modem with RS-232 interface in either a
9-pin D-sub or in a 5-pin screw connector.
The GD-02 is also DIN rail mounted and has the same RS-232 interface as the GD-01
plus a RS-422/RS-485 interface in a 4-pin screw connector, 2 alarm inputs and one relay
output. The GD-02 is in general more advanced than the GD-01. Besides the interface
differences there are also a lot of “soft” features such as callback and password func-
tionality.
The Westermo GD-series of modems can be used in data communication applications
together with other GSM modems, traditional analogue PSTN modems (like the TD-33)
or ISDN adapters (like the ID-90).
All configuration is made by AT-commands but in the GD-02 also dipswitches or remote
configuration can be used to set up the modem.
See the technical specifications and the AT-command description for more details.
Note! To get the modem to work properly it is necessary to use a subscription
(SIM-card) from a GSM network operator. To get all functions in the
GD- modems to work it is important that the wanted services are
enabled in the subscription. Please refer to the technical specification
for a list of GSM services supported by the modem.