TROB24 Series Thermostat
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2) Enter the password (637).
3) In this mode you can manually configure the MAC address, Device Instance and Baud Rate.
4) Power down the thermostat, connect the thermostat to the network and then power up the thermostat.
5) Repeat steps 1 to 4 for each.
6) To increase network efficiency or if there are less than 127 devices on the network, the Max_Master
value can be configured through WriteProperty service to the
Device Object.Max_Master
. For more
information, refer to the
MAC address and Max_Master
section on page 4.
Copy Config
Copy the thermostat’s entire configuration and broadcast it to other devices of the same type on the same
network.
1) With the thermostat in Operation Mode (jumper = RUN), go to the Quick Access Menu by pressing and
holding both function buttons on the thermostat for 5 seconds. Refer to the thermostat’s
Specification &
Installation Manual
for more details.
2) Enter the password (637).
3) Scroll to “Copy Config” and select yes. Follow onscreen instructions.
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 thermostat 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
of 127 is not the most efficient choice for the thermostat. The Max_Master default of 127 was selected to ensure
that any master, specifically a BACnet
®
client, can be found when the thermostat is first started.
Example 1:
This example 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.
MAC=0.
Max_Master=127
MAC=1,
Max_Master=127
Example 2:
This example is better but it’s still slower. The Max_Master is set to the most efficient value; however because
of the gap between the two MAC addresses, each unit must poll 4 units until it finds the right one to pass the
token.
MAC=0.
Max_Master=5
MAC=1 to MAC=4 are not used
MAC=5,
Max_Master=5
Example 3:
This example is an incorrect configuration. The MAC=0 will never find MAC=2 because it will never poll for the
master MAC address=2.
MAC=0.
Max_Master=1
MAC=2,
Max_Master=2
Example 4:
As a general guideline, the most efficient set up for an MS/TP network is one in which the units are
consecutively numbered starting at MAC address 0 and all have Max_Master=the maximum MAC address in
the system. If consecutive numbering is not possible, then the next most efficient set up is one in which all units
have Max_Master=the maximum MAC address in the system.
MAC=0.
Max_Master=3
MAC=1,
Max_Master=3
MAC=2,
Max_Master=3
MAC=3,
Max_Master=3
