Product “CLID-Network” : Access Control Network
The most powerful RS485 Network system for access control and door management

CLID-Network is a multipoint network system based on the RS 485 electrical standard whereby connections can be established among several satellites on the same cable. The communication protocol software is of the probabilistic type and the satellites can be Access Terminals as interfaces to card readers or alarm detectors. The logical structure of the Network is built of a PC as main Master and CLID-Tl/T2/T6 ; the Access Control software (ATZ) allows theoretically for connections of 32768 satellites (Card Readers).

The number of satellites connected on the network may vary according to

  • The application : simple verification, complex applications.
  • The length of the data message sent over the network.
  • The frequency of satellites-to-Master requests.
  • Practical operational parameters.

    • A topology should be limited to a maximum given number of satellites in order to not slow down the communication capability which would make the application inoperative.

    The total number of 32768 satellites is indeed theoretical ! In practice, such dynamic on-line applications would not be feasible because of too long response-time of the Master to satellites request. The only case in which an installation with such a huge number of satellites could be conceivable would be for site surveillance ; we would have a satellite requests triggered only by alarms and site accesses at a very low rate !

    CLID-Network allows 256 different terminals to be connected to the same cable and the liaison is usually guaranteed up to a distance of 1200 meters (4000 feet). Of course, this distance can be increased by using repeaters within the topology previously illustrated.

    CLID-Network basic network connection is made through a 4-cores shielded cable involving RS 485 communication together with the necessary power supply. Depending of specific topologies, power supply repeaters will have to be placed at some points on the network. The network supply topology can vary, in relation with the following parameters:

  • The type of satellites connected.
  • The number of satellites connected.
  • The geographical topology of the application.
  • Additional 24 VDC supply systems specific to an application like latch, bolts . . .

    • In fact, any kind of satellites can be placed up to a distance of 1200 meters from a power supply source ; this is made possible by accepting satellite power supply systems with consistent voltage drops.