CDX800 DESCRIPTION
2. Description of the CDX 800 communication module
2.1. General description
The communication module is a device for wireless data transmission. The communic-
ation module is one of the basic elements of AGNES system. The system AGNES character-
istics are described in reference
[1]
. The 869 MHz according to CEPT/ERC Rec 70-03 for
used radio frequency and for running equipment of a short distance (telemetrics, security sys-
tems, fleet management) or for radio equipment of small performance bands are 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]
.
One may simply imagine the CDX 800 module as a protocol converter between the
user device (PLC automatic, PC, data terminal, etc.) and radio network; it provides the user
with possibility to communicate simply between all the systems.
The CDX 800 module is controlled by communication 32-bit microprocessor. It ensures
radio communication, data transfer on serial user interfaces (1 x RS232/RS485, 1 x optional
port a 1 x CIO) and a number of diagnostic and service features. CDX 800 module in the basic
version has one user interfaces RS232/RS485 (multi-communication ports), which is program
configurable, and one interface for direct connection of inputs and outputs (CIO) for data
collection and technological process management. 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. Port 2
is configurable. RS232, RS485/RS422, M-BUS or CNT interfaces can be ordered as its
interface position.
Separate the two CDX 800 modems by a minimum distance 10 meters because
of communication problems.
2.2. Examples of possible applications
•
Security systems
•
Telematics
•
Telemetrics
•
Remote monitoring
•
Automatic sensors
•
Metering
2.3. Compatibility with other Conel company modems
Regarding the communication and data transfers, the CDX 800 module is compatible
with modules communicating via the ARNEP protocol on the RS232 interface. This means it is
possible to combine different types in one network and simply extend for example an existing
network of the CGU 04i CDA70 modules with new communication points using CDX 800
modules. In addition, the CDX 800 module provides some features not included in older types.
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.
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