Published by pchipkin December 10th, 2009
in BACnet MSTP and Delta Controls.
This device supports two protocols. One is BACnet MS/TP and the other is LinkNet (Delta’s own protocol).
When the product is shipped the internal jumper is set to LinkNet. Despite this BACnet MSTP is active and if you connect a MSTP client you can read and write the BACnet objects. What you cant do until you change the jumper is discover the device. It appears the only effect of the jumper is to enable the reply to a who-is.
Did you know that with the CAS BACnet Explorer you can add a device manually and then discover its objects and properties. Using this feature the DFM-200 was ‘discovered’ even with the protocol selection jumper in the wrong position.
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Published by cpascu December 10th, 2009
in BACnet, BACnet MSTP and Utilities and tools.
To change the CAS BACnet explorer MSTP MaxMaster.
1) Open the settings file with notepad. The settings file is stored in of two places
C:\Users\<username>\Documents\CAS BACnet Explorer\Settings.xml
C:\Users\<username>\Documents\CAS BACnet Explorer (beta)\Settings.xml
2) Find the iMSTPNmaxMaster value
<key name=”iMSTPNmaxMaster” value=”127“/>
3) Change the value to a number between 1-254. Note: 255 (OxFF) is reserved for broadcasts.
From the BACnet Spec:
This parameter represents the value of the Max_Master property of the node’s Device object. The value of Max_Master specifies the highest allowable address for master nodes. The value of Max_Master shall be less than or equal to 127. If Max_Master is not writable in a node, its value shall be 127.
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