FAQ
– CMC III
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Door control with CAN bus access
How many racks can be controlled with a CMC III system?
Each door requires a 7030.200 CAN bus access. This means two CAN bus accesses are
required for a rack with two doors.
A maximum of 16 CAN bus accesses can be connected to a CMC III Processing Unit and
two CAN bus accesses to a CMC III Processing Unit Compact. If a CMC III Processing Unit
is supplied only with PoE, a maximum of five handles can be connected. A system should
always be configured based on how the racks are positioned. A CMC III Processing Unit with
connected CAN bus access can be used for the front or rear or also for both sides.
The number of components thus depends on the configuration and on the number of doors
to be monitored.
How many reader systems must be installed?
Although the number of reader systems also depends on the application, at least one reader
system should be used for each CMC III system with electromagnetic handles (without a
reader system, the doors can only be opened remotely via the network or using a master
key). This can then control all handles that are connected to this CMC III system, namely, a
maximum of 16 units. Several reader systems can, however, also be connected to a CMC III,
for example, to keep the paths from the reader system and door as short as possible.
Consequently, it is better in a rack row to connect a reader system to every second or third
rack. The reader systems may either be used with equal rights for all handles, or allocated to
selected handles only.
Can a reader system be used to release selected doors only?
From software version V3.15.00, the connected reader units may be assigned to the
connected handles. If assigned in this way, only the respective handles may be opened with
a reader system. For example, if only three handles out of 16 are assigned to a reader
system, upon entering an authorised code, only these three handles will be released, and the
other connected handles will remain locked. One-to-one assignment of a reader system to a
handle is also supported with this function.
