Modbus Data - Smart temp SMT - 131 Manual

9 Auto Off Timer
10 Unoccupied Heat Set Point
11 Unoccupied Cool Set Point
12 Unoccupied Fan Mode
13 Backlight
14 Sensor Input Functions
15 Digital Input Functions
16 Reset Indoor Fan Mode
17 Belimo Mode
18 Modbus Address
19 Communications Baud
"r" Factory Reset

Modbus Data

The SMT-131 has integrated Modbus RTU communications. Using a Modbus master controller
such as the Smart Temp 770-HMI many of the SMT-131 thermostat features can be centrally
controlled and monitored.
Modbus is a simple protocol that is extremely popular due to its robustness and simple
implementation. It is also a "forgiving" protocol and will tolerate many installation errors. This
being stated however, correct wiring practices should be used to achieve maximum reliability. See
page 8 for details on wiring Modbus networks.
The SMT-131 Modbus data is within the "40XXX" range, this being holding registers. Depending
on your choice of Modbus Master you may need to enter the address using the full address - such
as "40012" or by selecting "Holding Registers" and entering the address simply as "12".
These modbus registers are shown as Base "1" (PLC addressing ) format. Depending on your
modbus master addressing format you may need to subtract 1 from these values to convert to
base "0" (protocol addressing) format.
Off, then 1 to 10 Hours in 30 Min Intervals (Default = OFF)
Off, then 5°C to 30°C (41°F to 86°F) (Default = OFF)
Off, then 5°C to 30°C (4°F1 to 86°F) (Default = OFF)
1 = Low (Auto) (Default)
2 = Med (Auto)
3 = High (Auto)
4 = Low (On)
5 = Med (On)
6 = High (On)
0 = On With Button Press Only
1 = Always On (High Brightness)
2 = Low Then High With Button Press (Default)
rS = Use In Place Of Onboard Sensor (Default)
Au = Average Onboard And Remote Sensor
dA = Display Sensor Value In Modbus Only
OC = Initiate Unoccupied Mode (Default)
db = Chime The Doorbell (Sw8 Must Be Off)
0 = Off (Default)
1 = On (If user sets fan to continuous mode, when the user
turns the thermostat off the fan mode will reset back to
automatic mode)
0 = Off (Default)
1 = On
Defines 0-10V Output For Belimo 6 Way Actuator
1 to 255 (Default = 7)
0 = 4.8K
1 = 9.6K (Default)
2 = 19.2K
0 = Off (Default)
1 = Force Reset - Resets All Installer Settings
Page 11