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What if you need to send unique SNVTs to more than 13 controllers or groups from an Xenta base unit?

Issue

What if you need to send unique SNVTs to more than 13 controllers or groups from an Xenta base unit?

Environment

  • LNS System
  • LON Devices
  • LonMaker/NL220

Cause

All devices with Neuron chips in them use an address table. This table holds the neuron addresses or group addresses of each device or group that receives a SNVT from it. That table only holds 15 entries and 2 of them are used in the base units for the TAC group and the Xenta group leaving only 13.

Resolution

If the signals are sent to a group that only occupies one entry in the address table of the sender and one in each receiver. If the binding is unacknowledged, one entry is taken in the sender for each node or group but not in the receivers.

So what if you need a unique occupancy signal for 50 controllers? Or a unique temperature setpoint for them? A group binding will not do because that is one single value to the entire group.

The Loytec L-Proxy communicates on Lon networks and is commissioned like other Lonworks devices but uses a proprietary chip set instead of a neuron. This allows its address table to contain 384 entries. It can also have up to 5 ports which can all be commissioned in the same network.

So if you send all of your SNVTs from the base units to the L-Proxy (up to 125 of them from a 401!), you can let the L-Proxy distribute them to the rest of the devices. Another benefit of that chipset is that the throughput is much greater than the neuron so it can handle such a load.

 

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Revision #:
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Last update:
‎2018-09-07 01:20 AM
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