SMT - 131
Manual
Ver 1.1
Page 2
Revision History
Version 1 Original Document
Version 1.1 Added Mode select in modbus
Index
Index 2
Introduction 3
Thermostat operation 3
Installation 4
Wiring Examples – HVAC Control 5
Wiring Examples – Ancillary Functions 7
Installer Options Menu 10
Modbus Data 11
Specifications 15
Page 3
Introduction
The Smart Temp SMT-131 thermostat has been designed for use in hotel rooms and other
locations where the user may be unfamiliar with thermostat operations. In these applications it is
important that the thermostat be very intuitive, robust and attractive. The SMT-131 thermostat
has been designed with these important goals is mind.
The SMT-131 also offers advanced energy conservation features such as set point limit control,
un-occupied heating and cooling settings as well as Modbus RTU communications for integration
with the “Building Automation System” (BAS) or “Hotel Check In” system. Additionally, the SMT131 seamlessly interfaces with the Smart Temp OC-3D occupancy detection system and “Door
Station” system.
Thermostat operation
The SMT-131 is an extremely simple thermostat to
operate and does not normally require a user
manual or user training.
The diagram to the left shows all LCD elements and
the 6 buttons (Up / Down / Make Up Room / Do Not
Disturb / On – Off / Fan Mode.
Depending on switch and installer menu settings
not all LCD segments maybe shown.
On/Off
Tap the On/Off button to turn the thermostat On or Off. (To ensure the simplest user operation
the user cannot select heating or cooling Mode directly).
Set Temperature
Adjust the target temperature with the Up or Down button.
Fan
Single fan speed mode (Sw1=Off)
Tap the fan button to cycle between auto fan and continuous fan mode.
Three fan speed mode (Sw1=On)
Tap the fan button to cycle between low, medium, high and auto fan speeds. Press and hold the
fan button to turn the fan on continuously.
Page 4
Note. Option 16 in the installer menu (See page 11) permits you to set the SMT-131 to reset the
indoor fan to Automatic Mode (cycle on and off with heating and cooling) every time the
thermostat is turned off and then back on.
Ventilation Mode
If permitted by DIP Sw7, (See page 5) the user can run the indoor fan only (Ventilation Mode)
when the SMT-131 is off by tapping the fan button. Each tap of the fan button will cycle between
all available fan speeds.
“Make up Room” & “Do Not Disturb” Buttons
When enabled by DIP Sw8, (See page 5) pressing these buttons will activate relevant LCD
segments and backlight colour on the optional outside door station as well as write data to
Modbus for monitoring by a BAS system.
Installation
System Design
Great effort has been taken to make the SMT-131 system intuitive, reliable and easy to install.
Using a common sense approach to the installation will ensure this product is installed easily and
to the customer’s satisfaction. Please read and understand this instruction manual so that
installation, testing and commissioning process is undertaken in an efficient and effective
manner.
Wall Controller
Open the SMT-131 wall controller by placing a flat blade
screwdriver or coin in the slot on the bottom of the thermostat
case and push in gently inwards and twist to release the case
locking clip. Gently pry the two case halves apart at the base taking
care not to twist the case too hard as this may crack the LCD.
Terminal Identification
B Modbus Data “B”
A Modbus Data “A”
0 0-10V Zero Volt Terminal
H 0-10V Heat Output
C 0-10V Cool Output
- 24V Common
+ 24V Active
W Heat (Or Reversing Valve)
Y Cool (Or Compressor) D- Digital Input 0 Volt
3 Fan – High Speed D+ Digital Input Active
2 Fan – Medium Speed S- Sensor Input 0 Volt
1 Fan – Low Speed S+ Sensor Input Active
Page 5
DIP Switch Settings
Switch
Function
On
Off
Sw1
Indoor Fan Mode
3 Fan Speed
1 Fan Speed
Sw2
Equipment Type
Heat Pump
Heat Cool
Sw3
HP Mode (Sw2= ON)
HC Mode (Sw2=OFF)
Rev Valve Heat (B)
HE – Fan With Heat
Rev Valve Cool (O)
HG – No Fan In Heat
Sw4
Not Used
Sw5
Comp Protection Delay
5 Min Anti Cycle
No Anti Cycle
Sw6
Not Used
Sw7
Ventilation Mode
Permitted
Not Permitted
Sw8
Door Station (Optional)
Fitted
Door Station Not Used
Note: The SMT-131 reads the switch settings on power up only. If you change any DIP switch
settings you must cycle power or press the reset button before these changes will take effect.
Wiring Examples – HVAC Control
Caution - Although the SMT-131 is a robust device, wiring errors can potentially
damage the thermostat. This damage is NOT covered by warranty. Take care when
wiring 24V near sensor inputs or the modbus communications terminals.
Provided below are a few typical examples of wiring. These can be adapted to meet specific
project or user needs. For example, heat pump 3 speed fan and heat pump single speed fan are in
essence the same wiring except for DIP switch 1 position and the fan med and high speed
terminal wiring.
Heat Pump System - 3 Fan Speed
Switch Settings
Sw1 = On - 3 Fan Speed
Sw2 = On - HP Mode
Sw3 = On/B Off/O
Sw4 = N/A
Sw5 = On - Comp Delay
Sw-6 = Customer Pref
Sw7 = Customer Pref
Page 6
When using a separate power supply for the valve, please ensure both power supply’s 0 volt
terminals are joined so the 0-10V signal has a return path.
In this example, the relay “Y” terminal could be used for a circulating water pump call if needed.
Heat Cool System - 1 Fan Speed
Switch Settings
Sw1 = Off - 1 Fan speed
Sw2 = Off - HC Mode
Sw3 = On/HE Off/HG
Sw4 = N/A
Sw5 = On - Comp Delay
Sw6 = Customer Pref
Sw7 = Customer Pref
0-10V Heating Valve With Cool - 1 Fan Speed
Switch Settings
Sw1 = Off - 1 Fan Speed
Sw2 = Off - HC Mode
Sw3 = On/HE
Sw4 = N/A
Sw5 = On - Comp Delay
Sw6 = Customer Pref
Sw7 = Customer Pref
Line Powered Cooling Valve - 3 Fan Speed
Switch Settings
Sw1 = On - 3 Fan Speed
Sw2 = Off – HC Mode
Sw3 = On/HE
Sw4 = N/A
Sw5 = Off - No Delay
Sw6 = Customer Pref
Sw7 = Customer Pref
Page 7
Belimo 6 Way Valve
Belimo manufactures an actuator that
is in full cooling at 2V, off at 6V and full
heating at 10V. To use this type of
actuator with the Smart Temp SMT131 you must enter the installer menu
and set valve type to “Belimo Mode”.
Information on the installer menu can
be found on page 10 of this manual.
Given the SMT-131 provides 2 x 0-10V outputs, when in “Belimo Mode”, the heating 0-10V
output controls the Belimo valve while the cooling 0-10V output provides a signal to drive a fully
modulating fan should it be required.
As with normal valves, the 0-10V heating and cooling span settings in the installer menu scale the
heating and cooling outputs. Factory default is full heating and full cooling 1°C from set point. The
heating and cooling span can be adjusted independently to a maximum of full heating and full
cooling 3°C from set point. The output is linear.
Wiring Examples – Ancillary Functions
Additional capabilities can be used when wiring the SMT-131 to external devices. These include
BAS, room occupancy detection systems, door card readers and the optional Smart Temp outside
door stations.
Complete System Overview
As can be seen by the diagram to the left, the SMT-131
is the hub of a sophisticated hotel room HVAC control
and management system.
Connecting the SMT-131 to an automatic occupancy
detection system such as the Smart Temp OC-3D
(optional) permits you to precisely control HVAC energy
consumption by automatically selecting a more
economical room set temperature when the room is
unoccupied.
The optional door station connects quickly and easily to
the SMT-131. This provides the hotel guest with the
ability to request privacy or call for housekeeping when
needed. A doorbell function is also provided.
Network communications enables the room to be
“turned on” remotely as a guest arrives and “shut
down” at checkout – further saving money on energy
costs.
Page 8
Modbus Wiring
Modbus communications unlock many additional functions within the SMT-131 thermostat. It
also permits all modes, functions and controls to be remotely supervised and adjusted from a
central location if needed. Modbus object data can be found on page 10 of this manual.
The SMT-131 uses a high powered Maxim chipset that will “theoretically” permit the connection
of up to 255 devices on a single Modbus node. RF noises and other interferences will reduce the
real world permitted connections to a maximum of 200 in most cases.
Modbus and other communication protocol rely on the quality of cable and good installation
practises to ensure reliable communications. Modbus requires the use of screen cable with the
drain grounded in a single location.
when using a common power supply or when using a modbus master that also powers the SMT131, ensure the R (24v active), C (24v common) Data A & B wires are not crossed.
Hint! When the SMT-131 is connected to a working Modbus Network and receiving valid data,
the decimal point in the temperature display will blink. If there is no communication or the SMT131 is receiving corrupted data, this decimal point will remain on steady.
Modbus relies on a series connection and
will normally not tolerate “Star” wiring or
“T” branches.
Occupancy Input
When the room is detected “unoccupied” by a third party
device or the optional Smart Temp OC-3D occupancy
detection system, the SMT-131 will replace the user set point
with installer pre-set temperatures or alternatively, turn the
thermostat off. The user settings will return when the room is
again occupied.
The Digital Inputs in the SMT-131 are volt free. To initiate the
“unoccupied” function simply bridge the D+ and D- terminals
through a clean contact (switch or relay terminal).
DO NOT APPLY ANY EXTERNAL VOLTAGES TO THIS INPUT.
Page 9
Outside Door Station
When coupled with the optional
Smart Temp door station the guest
has the ability to set the room as “Do
Not Disturb”, call for housekeeping
or be alerted to visiting guests with a
pleasant doorbell chime. Hotel staff
are informed about the room status
or guest’s needs by text information
displayed on the door station LCD or
the door station backlight colours.
Connection between the SMT-131 and the hotel door station is by the supplied 1 metre cable
fitted with RJ12 plugs. Longer cables up to 10 metres maximum can be supplied at extra cost.
When fitting the door station, the SMT-131 DIP Sw8 must be ON. The outside door station will
flash all LCD segments if DIP Sw8 is in the wrong position.
Remote Temperature sensors
Occasionally the room thermostat cannot be
installed in the ideal location to measure the room
temperature accurately. In these circumstances
the SMT-131 can use optional remote
temperature sensors. These are a two wire device,
not polarity dependent and simply wired into the
SMT-131 sensor inputs terminals. Depending on
installer menu sensor settings, shown on page 11,
remote sensor(s) will either override the SMT-131 onboard sensor or average with the onboard
sensor. Multiple sensors can be used for averaging over larger areas if necessary.
Wireless (RF) remote sensors are also available if wiring cannot be installed economically.
Doorbell
A built in doorbell feature is included with the SMT-131 thermostat. This is normally activated by
the optional outside door station or via Modbus data link. In circumstances where this is not
convenient, the digital input terminals can be
assigned as a doorbell switch with the digital
input options detailed in the installer menu on
page 11. Simply place a momentary volt free
switch across the S+ and S- terminals to
activate the doorbell. Once pressed, the
doorbell will chime for 10 seconds.
Page 10
Installer Options Menu
The SMT-131 has an impressive list of options that can be installer selected. These options tune
the thermostat’s performance as well as set energy conservation settings. This menu is
deliberately hidden and difficult to enter to discourage unauthorised tampering.
The 2 steps to enter the installer menu are:
This section is removed for the web version of this manual to protect the security of
the thermostat. This information is only provided to our service agents or selected
trade customers. Please contact Smart Temp for further information.
Navigating Through The Installer Mode Settings
The bottom right button steps forward through the menu options, the bottom left button steps
you backwards.
Adjust your options with the up/down buttons.
Exit the menu saving changes by pressing and holding the bottom right (fan button) or waiting.
The SMT-131 will exit this menu automatically after 20 seconds.
Option List Table
Option
Setting
0
User Temperature Display
0 = Show Room and Set temperature (Default)
1 = Show Set Temperature Only
1
Temperature Format
C = Degrees Celsius (Default)
F = Degrees Fahrenheit
2
High Set Point Limit
Off, then 5°C to 30°C (41°F to 95°F) (Default = 30°C)
3
Low Set Point Limit
Off, then 5°C to 30°C (41°F to 95°F) (Default = 5°C)
4
User Set Point Dead Band
0.5°C to 5°C in 0.5°C Steps (Default = 1°C)
5
Span (Relays - Hysteresis)
0.5°C to 3°C in 0.5°C Steps (Default = 0.5°C)
6
Indoor Fan Purge
0 = Off (Default)
1 = Fan Purge - 1 Min
2 = Fan Purge - 3 Min
3 = Fan Purge - 5 Min
4 = Fan Purge - 10 Min
5 = Heat Only Fan Purge - 1 Min
6 = Heat Only Fan Purge - 3 Min
7 = Heat Only Fan Purge - 5 Min
8 = Heat Only Fan Purge - 10 Min
9 = Cool Only Fan Purge - 1 Min
10 = Cool Only Fan Purge - 3 Min
11 = Cool only Fan Purge - 5 Min
12 = Cool Only Fan Purge - 10 Min
Note - A 15 second fan purge is applied in all modes
7
0-10 Volt Heat Span
0.5°C to 3°C in 0.5°C Steps (Default = 1°C)
8
0-10 Volt Cool Span
0.5°C to 3°C in 0.5°C Steps (Default = 1°C)
Page 11
9
Auto Off Timer
Off, then 1 to 10 Hours in 30 Min Intervals (Default = OFF)
10
Unoccupied Heat Set Point
Off, then 5°C to 30°C (41°F to 86°F) (Default = OFF)
11
Unoccupied Cool Set Point
Off, then 5°C to 30°C (4°F1 to 86°F) (Default = OFF)
12
Unoccupied Fan Mode
1 = Low (Auto) (Default)
2 = Med (Auto)
3 = High (Auto)
4 = Low (On)
5 = Med (On)
6 = High (On)
13
Backlight
0 = On With Button Press Only
1 = Always On (High Brightness)
2 = Low Then High With Button Press (Default)
14
Sensor Input Functions
rS = Use In Place Of Onboard Sensor (Default)
Au = Average Onboard And Remote Sensor
dA = Display Sensor Value In Modbus Only
15
Digital Input Functions
OC = Initiate Unoccupied Mode (Default)
db = Chime The Doorbell (Sw8 Must Be Off)
16
Reset Indoor Fan Mode
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)
17
Belimo Mode
0 = Off (Default)
1 = On
Defines 0-10V Output For Belimo 6 Way Actuator
18
Modbus Address
1 to 255 (Default = 7)
19
Communications Baud
0 = 4.8K
1 = 9.6K (Default)
2 = 19.2K
“r”
Factory Reset
0 = Off (Default)
1 = Force Reset - Resets All Installer Settings
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.
Page 12
Data Format
Protocol Modbus RTU
Byte Format 1 Start Bit, 8 Data Bits, 1 Stop Bit, No Parity
Address 1 to 255
Baud 4800 / 9600 / 19200 BPS
Holding
Register
Type
Value
Comments
40001
Read Only
Device ID
Always Returns “131”
Use As A Sentinel Point
40002
Read Only
Firmware Version
Divide By 100 (e.g. Version 2.36 = 236)
40003
Read Only
DIP Switch
Settings
Binary Count
Sw 1 = 1, Sw2 = 2, Sw3 = 4, Sw 4 = 8 etc
40004
Read / Write
Occupancy Status
0 = Room is Unoccupied
1 = Room is Occupied
Note - Modbus can write “0” holding the
room unoccupied regardless of the occupancy
input.
Modbus cannot override the occupancy input
and hold the SMT-131 in occupied mode.
40005
Read Only
Bell Status
0 = Bell Is Silent
1 = Bell Is Chiming
40006
Read / Write
Door Station
Status
0 = Normal - No Activity
1 = “Make Up Room” Active
2 = “Do Not Disturb” Active
40007
Read / Write
HVAC Status
0 = Air Conditioning Off (1 or 3 Fan Speed)
1 = Low Speed Ventilation ( 1 or 3 Fan Speed)
2 = Med Speed Ventilation (3 Fan Speed Only)
3 = High Speed Ventilation (3 Fan Speed only)
4 = Air Conditioning ON (1 or 3 Fan Speed)
40008
Read / Write
Fan Status
3 Fan Speed Mode
0 = Low (Fan Auto)
1 = Med ( Fan Auto)
2= High (Fan Auto)
3 = Auto Fan Speed (Fan Auto)
4 = Low (Fan On)
5 = Med (Fan On)
6 = High (Fan On)
7 = Auto Fan Speed (Fan On)
1 Fan Speed Mode
0 = Fan Auto
4 = Fan On
Page 13
40009
Read / Write
User Set Point
Deg C = 0.5°C Steps
Deg F = 1°F Steps
Value / 10 ( e.g. 23.5°C = 235)
40010
Read / Write
Contact Reception
Notification
0 = Off
1 = Show Contact Reception on LCD
SMT-131 LCD will flash “Contact Reception”
on LCD and sound chime. User may accept
alert by touching any button on SMT-131
40011
Read Only
Room
Temperature
Value / 10 (e.g. 21.7c = 217)
40012
Read / Write
Temperature
Display
0 = Show Room and Set Temperature
1 = Show Set Temperature Only
40013
Read / Write
C/F Display
0 = Deg C format
1 = Deg F format
40014
Read / Write
User Set Point
High Limit
5°C to 30°C Range (41°F-86°F) in 1°C/F Steps
1:1
40015
Read / Write
User Set Point
Low Limit
5°C to 30°C Range (41°f-86°F) in 1°C/F Steps
1:1
40016
Read / Write
Dead Band
0.5°C to 5.0°C in 0.5°C Steps
1.0°F to 10.0°F in 1°F Steps
Value / 10 (e.g. 1.5°C Dead Band = 15)
40017
Read / Write
Relay Span
0.5°C to 3.0°C in 0.5°C Steps
1°F to 10°F in 1°F Steps
Value / 10 (e.g. 1.0°C Span = 10)
40018
Read / Write
Fan Purge Period
0 = Off
1 = Fan Purge - 1 Min
2 = Fan Purge - 3 Min
3 = Fan Purge - 5 Min
4 = Fan Purge - 10 Min
5 = Heat Only Fan Purge - 1 Min
6 = Heat Only Fan Purge - 3 Min
7 = Heat Only Fan Purge - 5 Min
8 = Heat Only Fan Purge - 10 Min
9 = Cool Only Fan Purge - 1 Min
10 = Cool Only Fan Purge - 3 Min
11 = Cool Only Fan Purge - 5 Min
12 = Cool Only Fan Purge - 10 Min
40019
Read / Write
0-10V Heat Span
0.5°C to 3°C in 0.5°C Steps
1°F to 6°F in 1°F Steps
Value / 10 (e.g. Heat Span of 1°C= 10)
40020
Read / Write
0-10V Cool Span
0.5°C to 3°C in 0.5°C Steps
1°F to 6°F in 1°F Steps
Value / 10 (e.g. Cool Span of 1°C = 10)
40021
Read / Write
Auto Off Timer
0 = 0ff
1 to 10 Hours.
Value / 10 (e.g. 3 Hour Auto Off Timer = 30)
40022
Read /Write
Unoccupied Heat
Set Point
0 = Off
5°C to 30°C in 0.5°C Steps
41°F to 86°F in 1°F Steps
Value / 10 ( e.g. 17°C Unoccupied Heat = 170)
Page 14
40023
Read / write
Unoccupied Cool
Set Point
0 = Off
5°C to 30°C in 0.5°C Steps
41°F to 86°F in 1°F Steps
Value / 10 ( e.g. 28.5°C Unoccupied Cool =
285)
40024
Read / Write
Unoccupied Fan
Mode
3 Fan Speed Mode
1 = Low (Fan Auto)
2 = Med ( Fan Auto)
3 = High (Fan Auto)
4 = Low (Fan On)
5 = Med (Fan On)
6 = High (Fan On)
1 Fan Speed Mode
0 = Fan Auto
4 = Fan On
40025
Read / Write
Backlight
0 = On With Button Press
1 = Always On (High)
2 = Always On Low - High With Button Press
40026
Read / Write
Remote
Temperature
Input Function
0 = Replace On Board Sensor With Remote
1 = Average Onboard Sensor With Remote
2 = Modbus Use Only (e.g. Coil Temp
Monitor)
40027
Read / Write
Digital Input
Function
0 = Occupancy Initiate
1 = Chime Door Bell
40028
Read / Write
Reset Fan Mode
0 = Leave Fan Mode Unchanged
1 = Reset Fan To Auto At Switch Off
40029
Read / Write
Belimo Mode
0 = Standard 0-10V Valve Logic
1 = Belimo 6V = Off 3 Way Valve Logic
40030
Read / Write
Modbus Address
1 to 255
40031
Read / Write
Baud Rate
1 = 4.8Kbs
2 = 9.6kbs
3 = 19.2Kbs
40032
Read Only
Digital Input
Status
0 = Open
1 = Closed
40033
Read Only
Internal Sensor
Value
Value / 10 (e.g. 23.3°C = 233)
40034
Read Only
Remote Sensor
Value
Value / 10 (e.g. 21.8°C = 218)
40035
Read Only
W relay status
0 = Off
1 = Energised
40036
Read Only
Y Relay Status
0 = Off
1 = Energised
40037
Read Only
High Fan Relay
Status
0 = Off
1 = Energised
40038
Read Only
Medium Fan
Relay Status
0 = Off
1 = Energised
40039
Read Only
Low Fan Relay
Status
0 = Off
1 = Energised
40040
Read Only
0-10V Heat Value
Value / 100 (e.g. 7.3V = 730)
40041
Read Only
0-10V Cool Value
Value / 100 (e.g. 2.1V = 210)
Page 15
40042
Read Only
Permitted Modes
(ver 2.1+ only)
0 = Auto (Heating and cooling called)
1 = Heat Only Mode
2 = Cool Only Mode
Specifications
Input Voltage 24VAC 50/60 Htz +/- 15%
Operating Temperature 0°C to 50°C (32°F to 122°F)
Operating RH 0-95% (Non Condensing)
Storage Temperature 0°Cto 65°C (32°F to 150°F)
Size 113 x 103 x 25mm.
Display Size 69.5 x 46.3mm.
Backlight White LED (Other Colours Available Upon Request)
Display Type STN Touch Panel
Relay Rating 30V @ 1Amp Max
0-10V Output Load 10mA Max
Control Range 5°C to 30°C (41°F to 86°F)
Memory Type Non Volatile - Settings Do Not Require Battery Backup
Communications Modbus RTU 4 .8K / 9.6K / 19.2 K
1 Stop Bit, 8 Data Bits, 1 Start Bit. No Parity.
Plastic ABS / Poly Blend – UV Stabilised and Fire Rated
Warranty 3 Year RTB
Page 16
Great care has been taken in the preparation of this manual. Smart Temp Australia P/L takes no
responsibility for errors or omissions contained in this document. It is the responsibility of the
user to ensure this controller or equipment connected to it, is operating to their respective
specifications and in a safe manner.
Due to ongoing product improvement Smart Temp Australia P/L reserves the right to change
the specifications of the SMT-131 thermostat (or its components) without notice.
All rights reserved. © Smart Temp Australia P/L 2011
Intellectual rights apply.
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