General
Remember the following when installing the Wiegand Reader Module:
Clustering
Clustering allows for the easy addition or replacement of Modules, it saves on wiring
and requires only one DC Power Supply connection for the Cluster.
The following applies:
• The WRM may be plugged directly into its associated Cluster Controller, or
into an existing Cluster consisting of a Cluster Controller and other Expansion
Modules.
• No more than eight Expansion Modules can be clustered with their associated
Cluster Controller.
• The WRM is powered and controlled via its Cluster Connector.
• Clustering with the Cluster Controller is recommended where Offline
Validation is a high priority, as the WRM will have reliable access to the Tag
Buffer and Memory on board the Cluster Controller.
S-Bus
S-Bus is useful when it would be convenient to install a WRM some distance from its
Cluster Controller. The following applies:
• The maximum S-Bus Cable length from the Cluster Controller to the WRM is
150 m (490 ft.).
• A maximum total of 8 addresses may be connected to the S-Bus.
• The S-Bus cable should be dual core and at least 0.21 mm2 (AWG24).
Screened cable is recommended where interference rejection may be
necessary in electrically noisy sites – and to provide SOME MEASURE* of
resistance to damage from nearby lightning strikes.
• Remotely mounted WRMs will also require a suitable Isolated DC Power
supply, as they are no longer plugged into the Cluster Controller.
• In the event of the S-Bus cable breaking, the WRM will stop working.
NOTE: *NOTHING can survive a direct lightning strike. Impro Technologies does
NOT claim that its products are lightning proof.
A more detailed chapter on S-Bus is included in the Impro (CCM) Cluster
Controller Module Installation Manual: HCM320-0-0-GB-XX
HMW300-0-0-GB-00 October 2013 Page 5
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General