Archive for December, 2007

How often should a BACnet MSTP device search for a new master?

Published by pchipkin December 14th, 2007 in BACnet MSTP. 0 Comments

A BACnet MSTP device should search for a new master after it has gotten the token more then Npoll – 1 times.
If your device is on a large network (20+ nodes) and Npoll is set to a very high number it may take a long time for your device to find a new device […]

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BACnet MSTP - Tusage_timeout, Nretry_token

Published by pchipkin December 14th, 2007 in BACnet MSTP. 0 Comments

Tusage_timeout
The minimum time without a DataAvailable or ReceiveError event that a node must wait for a remote node to begin using a token or replying to a Poll For Master frame: 20 milliseconds. (Implementations may use larger values for this timeout, not to exceed 100 milliseconds.)
Nretry_token
The number of retries on sending Token: 1.
Tusage_timeout variable is […]

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