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3
Communication Applications
Building Technologies
Fire Safety & Security Products
The various communication nodes in DMS7000 networks comprise of the following
HW-modules:
Communication Modules (for data processing)
Modems (for data transmission − standard V24/28 or PSK/QAM modulation)
MK7011 CERLOOP-Node (CS100-designation: CK100-11)
The CERLOOP-Node is employed in a ring shaped network in which all network
members are directly connected to a common data-bus (LOOP).
In a CERLOOP-Node telegrams are received from the network and passed on to the
connected equipmnt via the local interface. Telegrams which are not addressed to
this equipment will be retransmitted on the LOOP. Telegrams originating in the
equipment will be transmitted via local interface onto the LOOP.
The CERLOOP-Node monitors the communication link and signals any fault back to
the equipment. If it is no longer able to process the telegrams, relay contacts close to
over-bridge the loop node.
On detection of an open circuit in the transmission direction of the LOOP, telegrams
will automatically be transmitted in the opposite direction.
MK7012 CERBAN-Node (no longer on sale)
Application and function of the CERBAN-Node is similar to that of the
CERLOOP-Node. The basic difference is that the local interface in the MK7011 is
replaced by a CERBAN front interface in the MK7012. This permits the node to be
installed at a considerable distance from the connected equipment.
A network configuration using both CERBAN and CERLOOP-Nodes (END-LOOP)
can provide a higher telegram throughput than a pure CERBAN-Network.
MK7022 Communication unit (no longer on sale, CS100 designation: CK100−22)
The MK7022 Communication unit is used as a serial interface between a CERBE-
RUS network (CERBAN or CERLOOP) and a host. It controls the telegram traffic
from and towards the host, supervises the communication and re−establish the com-
munication path automatically after a disconnection.
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10.2008
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