CGU 04i DESCRIPTION
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2. Description of the communication module CGU 04i
2.1. General
GSM/GPRS communication module CGU 04i is a wireless data transmission device.
The communication module is one of the basic elements of AGNES GPRS system.
The system AGNES characteristics are described in reference
[1]
. GSM-GPRS infrastructure
is used for the wireless communication as a line layer. ARNEP protocol is implemented above
the line layer. The protocol ARNEP is described in reference
[2]
. On its basis the modules
create virtual private data network where data can be transferred between user devices via
any protocols.
One may simply imagine the CGU 04i module as a protocol converter between
the user device (PLC automatic, PC, data terminal, etc.) and GSM-GPRS infrastructure
of a mobile network operator, it provides the user with possibility to communicate simply
between all the systems. Apart from data transfers via GPRS the CGU 04i module enables
SMS.
The radio component GSM-GPRS is built in the CGU 04i module, consisting module
Cinterion.
GSM-GPRS module CGU 04i is controlled by communication 32-bit microprocessor.
It ensures GSM-GPRS communication, data transfer on serial user interfaces and a number
of diagnostic and service features. CGU 04i module in the basic version has one serial user
interface (communication port) RS232, one interface for direct connection of inputs
and outputs (CIO) for data collection and technological process management and one optional
user interface (RS232, RS422, RS485, M-BUSD, CNT). It is possible to set transfer
parameters and communication protocol for each user interface separately. As a result you
may communicate with various user interfaces using different communication protocols on
serial interface.
2.2. Examples of possible applications
•
Security
systems
•
Telematics
•
Telemetry
•
Vending and dispenser machines
2.3. Compatibility with other Conel company modems
Regarding the communication and data transfers the CGU 04i module is compatible
with the older CGU 04 type (or CGU 02). This means it is possible to combine both types
in one network and simply extend an existing network of CGU 04 (CGU 02) modules
with new communication points using CGU 04i modules. CGU 04i provides some features not
included in the older CGU 04 type.
User and industrial communication protocol implemented on serial interfaces are
compatible with the protocols used for Conel radio modems (e.g. CDA 70). Thus you may
establish complex combined data networks consisting of both radio and GPRS modems.
