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High Pressure Atomiser Series
BACnet Communication Module User Guide
www.neptronic.com
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Configuration Options
The following options enable you to configure and run the BACnet features of the humidifiers quickly.
Quick Setup
Configure the humidifier's baud rate and device instance without programming.
1. Connect the humidifier to the network and power it up.
2. The humidifier automatically configures the baud rate and device instance.
3. Repeat the steps for each humidifier.
Manual Setup
1. To use a Device_Instance other than 153,000, and/or if your site has more than one humidifier network,
go to the menu.
2. Disconnect the power to the humidifier, connect the humidifier to the network, and connect the power
again.
3. Configure the Max_Master value through WriteProperty service to the Device Object.Max_Master to
increase network efficiency or if there are less than 127 devices on the network.
MAC Address and Max_Master
The MAC address must be unique on the entire MS/TP network. However, having a unique MAC address and a high
baud rate does not guarantee efficient operation of the humidifier and other MS/TP units on the MS/TP network. Some
MAC address and Max_Master combinations are more efficient than others. BACnet requires token-passing units to
occasionally “poll” for other masters based on the MAC address and Max_Master.
A poor combination of MAC addresses and Max_Master can lead to a slower network due to lost time polling for masters
that are not present. Unless there are 126 other units on the MS/TP network, the default Max_Master value of 127 is
not the most efficient choice for the humidifier. The Max_Master default value of 127 was selected to ensure that any
master, specifically a BACnet client can be found when the humidifier is initially started.
Examples of Mac Address and Max_Master Configurations
The following are some of the examples to indicate the optimum combination of Mac address and Max_Master
configurations to ensure a quick and efficient output.
Example 1
•
MAC=0. Max_Master=127
•
MAC=1, Max_Master=127
This configuration is slow and inefficient because every time either unit is required to find another master unit, it has to
poll 126 units until it finds the right one to pass the token.
Example 2
•
MAC=0. Max_Master=5
•
MAC=1 to MAC=4 are not used
•
MAC=5, Max_Master=5
This configuration is better than Example 1 but it is still slower. The Max_Master is set to the most efficient value but
the gap between the two MAC addresses is high. Therefore, each unit must poll four units until it finds the right one to
pass the token.
Example 3
•
MAC=0. Max_Master=1
•
MAC=2, Max_Master=2
This is an incorrect configuration. The MAC=0 will never find MAC=2 because it will never poll for the master MAC
address=2.