AMX VIEWSTAT INSTALLATION GUIDE
Installation Guide
ViewStat Communicating Thermostat (VST)
ATTENTION: READ THIS FIRST!
Additional Documentation
For additional installation, configuration, programming and operating instruction, refer
to the ViewStat Communicating Thermostat Instruction Manual and ViewStat Protocol
Reference Guide documents, available on-line, at www.amx.com.
The ViewStat Communicating Thermostat (FIG. 1) operates similarly to a conventional
thermostat but has the unique capability of being controlled, either locally or remotely
from a NetLinx or Landmark control system. The ViewStat is compatible with any 24volt controlled HVAC system, as well as millivolt systems. This manual describes how
the ViewStat connects to several different types. See the ViewStat Communicating
Thermostat Instruction Manual (available online at www.amx.com) for details.
If necessary, contact AMX Technical Support for help with additional specific control
wiring scenarios
Message display
Main display
hinged
front panel
Mode
button
Adjust buttons
.
Scroll/Setup
buttons
base
Enter button
Fan button
Communication
terminals
HVAC Equipment
terminals
FIG. 1 ViewStat Communicating Thermostat
The ViewStat is designed to work with VST-TTM (Temperature) and VST-TRH
(Temperature and Humidity) support modules, and remote sensors.
Connecting the ViewStat to AMX Control Systems
The Viewstat (VST) has a single RJ-45 jack on the rear panel, and uses ICSNet
cabling to connect to NetLinx or Landmark control systems.
Note: The terms "PhastLink" and ICSNet" are essentially interchangeable within the
context of cabling/connectors. They both use a standard 10BaseT type connection (i.e.
Category 5 wire and RJ-45 connectors), and they share the same pinout information
for the RJ-45 jacks. Generally the term "PhastLink" is used when dealing with
Landmark, and "ICSNet" is used when describing NetLinx control systems.
PHASTLink cables follow the EIA/TIA 568A color code, and NetLinx cables follow the
EIA/TIA 568B color code. The wires should be connected in the standard manner
described in the following table.
If standard EIA/TIA 568A/B color coding is followed, wiring problems will be minimized.
PHASTLink RJ-45 Pinout Information (EIA/TIA 568 A)
Pin Wire Color Polarity Function
1 White/Green + Transmit
2 Green - Transmit
3 White/Orange - Mic
4 Blue - Ground
5 White/Blue + 12 VDC
6Orange + Mic
7 White/Brown + Receive
8 Brown - Receive
TIA 568A
NetLinx RJ-45 Pinout Information (EIA/TIA 568 B)
Pin Wire Color Polarity Function
1 Orange/White + Transmit
2 Orange - Transmit
3 Green/White - Mic
4 Blue - Ground
5 White/Blue + 12 VDC
6 Green + Mic
7 White/Brown + Receive
8 Brown - Receive
TIA 568B
1 2 3 4 5 6 7 8
(female) (male)
RJ-45 connector - pin configurations
Note: It is important that the correct pairing is observed. Transmit, Receive, and
Mic need to be on twisted pairs. Splitting pairs (e.g., using a white/green wire with a
blue/white wire for transmit) will result in increased crosstalk, and may result in bus
failure or noise on the intercom.
1 2 3 4 5 6 7 8
Installing the Cat5 Suppression Ferrite
Before connecting the ICSNet cable, install the CAT5 Suppression Ferrite (provided),
as described below (no tools required):
1. Release the latch to open
the plastic enclosure.
2. Insert the Cat5 cable
and close the enclosure.
3. Installation
complete.
FIG. 2 Installing the CAT5 Suppression Ferrite
Connecting to a NetLinx Control System
To connect a single VST to a NetLinx control system, use ICSNet cabling to connect
the RJ-45 jack on the VST to any available ICSNet jack on the NetLinx Master. The
maximum cabling distance between the VST and Master is 1,000 ft. (304.8 m).
To connect multiple ViewStats to a NetLinx system, use a NetLinx Hub (NXC-NH) to
add additional ICSNet ports to the system. Connect the RJ-45 jack on the VST to an
available ICSNet jack.
Connecting to a Landmark Control System
To connect a single VST to a Landmark control system, use PhastLink cabling to
connect the RJ-45 jack on the VST to any available PhastLink jack on the Landmark
Master. The maximum cabling distance between the VST and Controller is 1,000 ft.
(304.8 m).
To connect multiple ViewStats to a Landmark system, use a Landmark Hub (PLHRPT) to add additional PhastLink ports to the system. Connect the RJ-45 jack on the
VST to an available PhastLink jack.
Connecting the ViewStat to the HVAC System
Before connecting the VST to the HVAC system, install the 24 VAC Suppression
Ferrite, to eliminate any potential noise problems.
Installing the 24 VAC Suppression Ferrite
Before connecting the 24 VAC power supply cable to the HVAC system, install the 24
VAC Suppression Ferrite (provided), as described below (no tools required - see
FIG. 3):
1. Pass the 24VAC power
cord through the ferrite
bead.
2. Loop the cable around
and pass it through the
ferrite bead again.
3. Gently pull the cable
to eliminate excess
slack.
FIG. 3 Installing the 24 VAC Suppression Ferrite
Setting the DIP Switch
Set the DIP switch located on the thermostat circuit board (FIG. 4) according to the
application needs (see the DIP Switch Settings table below for details).
FOSSIL
MULTI
MASTER
ON
H/C
Common (black) from
24 VAC HVAC System
Power (red)
from 24 VAC
HVAC System
jumper from RC to RH
cutout
OFF
SINGLE
SERVANT
ELECTRIC
HT.PUMP
FIG. 4 Setting the DIP Switch
The following table shows what each switch corresponds to depending on position.
Switch one should be set in the “OFF Servant” position unless you plan to broadcast
readings from remote temperature sensors to other thermostats in the system when
there is no control system in place.
DIP Switch Settings
Application
Single Stage Furnace & AC Servant Fossil Single H/C
Two Stage Furnace & Two Stage AC Servant Fossil Multi H/C
Roof Top Unit (Two Stage Heat & Two Stage
Cool)
Boiler with AC (Two Transformers) Servant Fossil Single H/C
Single Stage Heat Pump Servant Electric Single HT. Pump
Two Multi-stage Heat Pump Servant Electric Multi HT. Pump
First Stage Radiant Floor Heat, Second
Stage Furnace One Stage of Cooling
Switch #1Switch #2Switch #3Switch
Servant Fossil Multi H/C
Servant Fossil Multi H/C
#4
Attaching the MiniVerter
Before mounting the VST, you must attach the MiniVerter to the rear panel:
1. Detach the faceplate from the base of the VST (FIG. 1).
2. Pull the stripped/tinned wires through the cutout in the center of the base.
3. Connect the communications wiring:
a. Blue to B-
b. Orange to B+
c. Red/White to A-
d. Black/White to A+
4. Connect the power wiring (FIG. 5):
a. Connect Black (common) from the HVAC system to C on the VST
Communication terminal.
b. Connect Red (24 VAC power) from the HVAC system to R on the VST
5. Jumper RH to RC (FIG. 5):.
6. Insert the MiniVerter (connector-side first) into the guide-slots located on the
7. Slide the MiniVerter back into its locking position in the mounting bracket
Communication terminal.
bottom of the MiniVerter mounting bracket (FIG. 6).
(FIG. 6).
from
MiniVerter
FIG. 5 ViewStat base with Communication, Power and Equipment terminals
ViewStat base (top view)
1
Insert the MiniVerter
(connector-side down)
into the guide slots
inside the mounting
mounting
bracket
bracket.
Snap into place
3
Slide the MiniVerter into locking
position in the bracket.
2
MiniVerter
FIG. 6 Inserting the MiniVerter into the mounting bracket (top view).
8. With the connector-side of the MiniVerter seated in the guide-slots, gently
press the opposite side of the MiniVerter in and down, to snap it into its locked
position on the mounting bracket.
Connecting the ViewStat to the HVAC System
Warning!
• 120 volts may cause serious injury from electrical shock. Disconnect electrical
power to the HVAC system before starting installation. This system is a lowvoltage system.
• Improper installation may cause serious injury from electrical shock. This system must be installed by a qualified contractor in accordance with NEC Standards and applicable local and state codes.
For HVAC system wiring diagrams (for Single-Stage Furnace and AC, Two-Stage
Furnace and Two-Stage AC, Roof-Top Unit (Two-Stage Heat and Two-Stage Cool),
Boiler With AC (Two Transformers), and Single Stage Heat Pump Configurations,
refer to the Wiring Diagrams section in the ViewStat Communicating Thermostat
Installation Instructions document (included).
Maximum Cable Distances
Maximum Cable Distances
Between the VST and NetLinx or LandMark Controller: 1000’ (304.8m)
Between support module and VST: 1000’ (304.8m)
Max. cumulative cable length between multiple support modules and VST: 1000’ (304.8m)
Between support module and remote sensor: 300’ (91.44m)
Additional Information
Refer to the ViewStat Communicating Thermostat Instruction Manual (available
online at www.amx.com) for additional information and details on the VST and
related devices, including:
• Product Specifications for the VST and Support Modules
• Configuration, installation and wiring of the VST, Support Modules and Remote
Temperature Sensors.
• Programming and operation instructions.
• HVAC system wiring diagrams.
AMX Corporation reserves the right to alter specifications without notice at any time.
For full warranty information, refer to the AMX Instruction Manual(s) associated with your Product(s).
AMX Corporation. All rights reserved. The AMX logo is a trademark of AMX Corporation. AMX reserves the right to alter specifications without notice at any time.
3000 RESEARCH DRIVE, RICHARDSON, TX 75082 • 800.222.0913 • 469.624.7153 • fax 469.624.7153 • technical support 800.932.6993 • www.amx.com
062-004-2639 6/04 ©2004
93-0944
REV: C
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