Controller Mac Address Assignment - Honeywell Spyder 5 User Manual

SPYDER MODEL 5 ENGINEERING TOOL – USER GUIDE
NOTE: Cloning of the device application can be done before or after the source-target definition of the devices and vice
versa.

Controller MAC Address Assignment

Automatic MAC Address Assignment
The factory setting of the MAC address of an IRM controller is 0xFF by default. On first power up, a controller will
automatically assign itself a unique MAC address within the range of assignable MAC addresses. The range of
assignable MAC addresses is defined by the Min MAC and Max MAC settings within the controller. For new factory
controllers, the default value for Min MAC is 1 and for Max MAC it is 32 (= Max Master setting in Niagara).
NOTE: The Max Master setting can be extended in Niagara to 127 at maximum and saved into the controller.
Once the controller has found a valid MAC address, it is saved in the controller permanently. From now on and on every
power up or system reset, this MAC address is used for MSTP communication.
The permanent MAC address changes automatically if any of the following conditions happen:
the Auto MAC process is re-triggered by Niagara via "You are" command using the MAC address 255 (0xFF)
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there is a conflict caused by devices in the network with the same MAC address.
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reset to factory defaults by pressing the service pin during power on
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Manually Changing MAC Addresses
In some scenarios, you might intend to change the MAC addresses:
Example:
If a small number of controllers are connected to a network, the Auto MAC function executed in the controller may result
in huge gaps of the assigned MAC addresses, e.g. 2, 7, 16, 23 and 31. Such a MSTP network is not optimized in terms of
bandwith usage.
To optimize the network, you can manually change the MAC addresses of the controllers in Niagara (see also section "
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