T9800 series BACnet MS/TP Networked Thermostat Controller Technical Bulletin
Rev 1.4
5 | P a g e
and the last device has an EOL connected.
3.3 Setting the network parameters
All network configuration is done through the software. After power on the controller, and the fan
coil is power off, user can enter the controller setting mode by press the “fan” and “generale”
button simultaneously for 5 seconds. In setting mode, user can change the MAC address and baud
rate for the network. The setting index is 1 and 14.
Table 2 Network parameters
The valid address is 6-128. And the default value is 128, which is not
valid for a master device. User should change the MAC before
connect. Two devices on the same bas can’t have the same MAC
address.
The default value is Auto, which allows the device to automatically
detect the baud rate of the BACnet bus and operate at that speed.
An incorrect value causes the device to not communicate on the
network, and can potentially cause the network to fail. Options for
this setting are Auto, 9,600, 19,200, 38,400, and 76,800 Baud.
3.4 MS/TP controller mapping
3.4.1 Preparation
Before you map a T9800 Series Network Thermostat Controller into an NAE:
1. Decide which points within the thermostat controller need to be mapped. Only map
the points that need to be viewed on a regular basis because excessive mapping
lowers system performance. Suggested points for mapping include Zone Temp, Set
Point, Mode and Fan Speed.
2. Verify that a Field Bus is defined in the NAE. BACnet MS/TP devices attach to a Field
Bus. Refer to the BACnet MS/TP Integration with the NAE Technical Bulletin (LIT-
12011013) or the Metasys N2 Communication Bus Technical Bulletin (LIT-636018)
for instructions on how to define a Field Bus.
3.4.2 Adding a Thermostat Controller
The thermostat controller must be added before its points can be mapped. To add the
thermostat controller, select either the Field Bus and choose Field Device from the Insert
menu. Assisted Definition using Auto Discovery is the easiest way to add a new thermostat
controller online; however, this method requires that the thermostat controller to be added is
connected and ready to communicate. Device addresses must be unique from 6 to 127 for
the BACnet MS/TP.
3.4.3 Adding BACnet MS/TP Points
The required points must be mapped under the thermostat controller device. To map the
points, select the thermostat controller device under the BACnet Integration (refresh the tree
view if required to see a newly added thermostat controller device) and choose Field Point
from the Insert menu. Assisted Definition using Auto Discovery is the easiest way to add new
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