Viconics PIR Ready7 VT76x7 Series Use and care manual

1
PIR Ready7 VT76x7 Series
Programmable & Non-Programmable Thermostats
For Commercial HVAC Applications
LonWorks Integration Manual
ITG-VT760x7-PIR-LON-E01
(028-6007 R1 - Issue Date: May 30, 2008)

2
Product Overview
The VT76x7 PI thermostat family is specifically designed for single stage
and multi-stage control of heating/cooling equipment such as rooftop and
self-contained units with humidifier and/or dehumidifier. The product
features an embedded complete humidity solution with an intuitive, menu-
driven, backlit LCD display that walks users through the programming steps,
making the process extremely simple. Accurate temperature & relative
humidity control is achieved due to the product’s PI time proportional control
algorithm, which virtually eliminates temperature offset associated with
traditional, differential-based thermostats.
All models contain one digital input, which can be set by the user to monitor
filter status, activate a remote temporary occupancy switch, and/or used as
a general purpose service indicator. The two models contain a SPST auxiliary switch, which can be used to
control lighting or disable the economizer function and a discharge air sensor input.
The thermostats are also compatible with the new Viconics PIR cover accessories. Thermostats equipped
with a PIR cover provide advanced active occupancy logic, which will automatically switch occupancy levels
from Occupied to Stand-By and Unoccupied as required by local activity being present or not. This advanced
occupancy functionality provides advantageous energy savings during occupied hours without sacrificing
occupant comfort. All thermostats can be ordered with or without a factory installed PIR cover.
The additional following documentation is available on www.viconics.com
- Detailed information on the thermostat (VT76x7X5x00) is available in document LIT-VT76x7-PIR-Exx
- PIR application information and examples, are available on document: APP-VT76-PIR-Guide-Exx
- PIR cover installation information is available on document: PIR Cover Installation-Exx
Contents
• PID History Revision Table
• Thermostat Objects
• SNVTs and SCPTs Table Per Model
• Input Network Variables (nvi’s) Description
• Output Network Variables (nvo’s) Description
• Configuration Properties (nci’s) Description
• Integration - Global Commands
• Integration - Graphic User Interface (GUI) Objects
• Integration - Configuration Objects
• Wiring Guide
o Overview
o Network Configuration
o Maximum Number Of Devices
o Maximum Cable Length
o Repeaters
o Terminators
• Network Adapter
• Software Files
• RoHS and Non-RoHS APB and NXE Files
• Device Identification
• Tips And Things You Need To Know
• Troubleshooting Section
• Document Control
F
ig.1 VT76x7B Thermosta
t

3
PID History Revision Table
XIF, APB and NXE File Names and Corresponding PIDs. This manual information is to be used only with
the current released VT76x7 PIR ready thermostats.
Used on current
released thermostat APB / NXE / XIF file names Revision Level Associated PID
PIR Ready VT76x7 Series VT76RH_PIR.XIF Rev 4.0 80:00:C5:55:00:04:04:22
This manual information is NOT to be used only with the previously released VT76x7 thermostats.
Previously
released thermostat APB / NXE / XIF file names Revision Level Associated PID
VT76x7 Series VT76x7.XIF Rev 3.0 80:00:C5:55:00:04:04:13
Thermostat Objects
V
T76x7 Space Comfort
Object Type
nvoSpaceTemp
SNVT_temp_p
Configuration Properties
Send Heartbeat
Temperature Setpoints
Minimum Send Time
Receive Heartbeat
nviSpaceTemp
SNVT_temp_p
Mandatory
Network
Variables
Optional
Network
Variables
Manufacturer
Network
Variables
nvoUnitStatus
SNVT_hvac_status
nvi ApplicMode
SNVT_hvac_mode
nvoEffectOccup
SNVT_occupancy
nviOccManCmd
SNVT_occupancy
nvoOutdoorTemp
SNVT_temp_p
Manufacturer Configuration Properties
Please see the manual for details.
-
Plug-in for configuration available
nviTimeSet
SNVT_time_stamp
nviSetpoint
SNVT_temtp_p
nvoSccStatus
SNVT_state_64
nviOutdoorTemp
SNVT_temp_p
nvoEffectSetpt
SNVT_temp_p
nvoSetpoint
SNVT_temp_p
nvoRHStatus
UNVT

4
SNVTs1and SCPTs2Table Per Model
No
Sub
Point Name
Snivet Type
Enumeration and
Signature Type
VT7657B5x00E VT7607B5x00E
0 nviSpaceTemp SNVT_temp_p X X
1 nviOutdoorTemp SNVT_temp_p X X
2 nviOccManCmd SNVT_occupancy X X
3 nviApplicMode SNVT_hvac_mode X X
4 nviSetpoint SNVT_temp_p X X
5 nviTimeSet SNVT_time_stamp X N/A
6 nciDaySched[0] UNVT_day_sched X N/A
7 nciDaySched[1] UNVT_day_sched X N/A
8 nciDaySched[2] UNVT_day_sched X N/A
9 nciDaySched[3] UNVT_day_sched X N/A
10 nciDaySched[4] UNVT_day_sched X N/A
11 nciDaySched[5] UNVT_day_sched X N/A
12 nciDaySched[6] UNVT_day_sched X N/A
13 nciSetPts SNVT_temp_setpt X X
1 occupied_cool x x
3 unoccupied_cool x x
4 occupied_heat x x
6 unoccupied_heat x x
14 nciCfg1RtuHp UNVT_cfg_1_rtu_hp X X
Associate with UNVT_cfg_1_rtu_hp format file
1 password Unsigned-Long x x
2 unoccupied_timer Unsigned-Short x x
3 anticycle Unsigned-Short x x
4 power_up_delay Unsigned-Short x x
5 temporary_occ_time Unsigned-Short x x
6 heating_stages_CPH Unsigned-Short x x
7 cooling_stages_CPH Unsigned-Short x x
8 heat_maximum_setpoint SNVT_temp_p x x
9 cool_minimum_setpoint SNVT_temp_p x x
10 OA_temp_heat_lockout SNVT_temp_p x x
11 OA_temp_cool_lockout SNVT_temp_p x x
12 calib_room_sensor SNVT_temp_diff_p x x
13 calib_outside_air_sensor SNVT_temp_diff_p x x
14 deadband Unsigned-Short x x
15 fan_mode Enumeration Set Used:
fan_mode_b-t x x
16 fan_control Enumeration Set Used:
off_on_state_t x x
17 fan_delay Enumeration Set Used:
off_on_state_t x x
18 keypad_lockout Enumeration Set Used:
rem_lock_t x x
19 proportional_band Unsigned-Short x x
20 temperature_units Enumeration Set Used:
temp_unit_t x x
21 frost_protection Enumeration Set Used:
off_on_state_t x x
22 menu_scroll Enumeration Set Used:
scroll_type_t x x
1: SNVTs: Standard Network Variables Types
2: SCPTs: Standard Configuration Parameters Types

5
No
Sub
Point Name
Snivet Type
Enumeration and
Signature Type
VT7657B5x00E VT7607B5x00E
15 nciCfg3RtuHp UNVT_cfg_3_rtu_rh X X
Associate with UNVT_cfg_3_rtu_rh format file
1 di_config Enumeration Set Used:
input_cfg_model_d_t x x
2 aux_contact_config Enumeration Set Used:
aux_contact_cfg_t x x
3 number_of_events Enumeration Set Used:
nb_of_events_t x N/A
4 progressive_recovery Enumeration Set Used:
off_on_state_t x N/A
5 number_of_heating_stages Unsigned-Short x x
6 number_of_cooling_stages Unsigned-Short x x
7 rh_frontal_display Enumeration Set Used:
off_on_state_t x x
8 humid_low_reset_temp SNVT_temp_p x x
9 humid_high_reset_temp SNVT_temp_p x x
10 dehum_lockout_temp SNVT_temp_p x x
11 humidification_high_limit_setpoint SNVT_lev_percent x x
12 humid_low_reset_rh_setpoint SNVT_lev_percent x x
13 dehumidification_hysterisys SNVT_lev_percent x x
14 rh_sensor_calibration Signed-Long x x
15 humidification setpoint SNVT_lev_percent x x
16 dehumidification_setpoint SNVT_lev_percent x x
17 dehumidification_lockout_function Enumeration Set Used:
off_on_state_t x x
16 nciHvacType SNVT_hvac_type X X
17 nciSccModel UNVT_model_info_2 X X
Associate with UNVT_model_info_2 format file
Thermostat Model x x
Software Version x x
18 nvoSpaceTemp SNVT_temp_p X X
19 nvoUnitStatus SNVT_hvac_status X X
mode x x
heat_output_primary x x
heat_output_secondary N/A N/A
cool_output x x
econo_output N/A N/A
Fan_output x x
in_alarm x x
20 nvoOutdoorTemp SNVT_temp_p X X
21 nvoEffectOccup SNVT_occupancy X X
22 nvoSccStatus UNVT_thermo_state_rtu_rh X X
Associate with UNVT_thermo_state_rtu_rh format file
1 fan_output True bit index 2 x x
2 cooling_stage_1 True bit index 3 x x
3 cooling_stage_2 True bit index 4 x x
4 auxiliary_contact True bit index 5 x x
5 heating_stage_1 True bit index 6 x x
6 heating_stage_2 True bit index 7 x x
7 di_direct_status True bit index 17 x x
8 local_pir_motion True bit index 24 x x
9 service_alarm True bit index 12 x x
10 filter_alarm True bit index 13 x x
11 fan_lock_alarm True bit index 25 x x
12 set_clock_alarm True bit index 22 x x
13 frost_protection_alarm True bit index 23 x x

6
No
Sub
Point Name
Snivet Type
Enumeration and
Signature Type
VT7657B5x00E VT7607B5x00E
23 nvoRHStatus UNVT_rh_status X X
Associate with UNVT_rh_status format file
local_humidity_level SNVT_lev_percent x x
supply_humidity_level SNVT_lev_percent x x
effective_reset_humid_setpoint SNVT_lev_percent x x
pi_humid_demand_output SNVT_lev_percent x x
dehumid_output_active Enumeration Set Used:
off_on_state_t x x
24 nvoEffectSetpt SNVT_temp_p X X
25 nvoSetpoint SNVT_temp_p X X
26 nciSndHrtBt SNVT_time_sec X X
27 nciMinOutTm SNVT_time_sec X X
28 nciRcvHrtBt SNVT_time_sec X X
29 nciMajVer SCPT_maj_ver X X
30 nciMinVer SCPT_min_ver X X

7
Input Network Variables (nvi’s) Description
Parameter Variable Name Function
Room
Temperature network input SNVT_temp_p
nviSpaceTemp
 This input network variable provides a network remote
temperature value to the thermostat. If a valid value is present,
the internal temperature reading (internal sensor) is no longer
used.
 Valid Range: -40 to 122°F (-40 to 50°C)
 Default Null (release) Value: 621.81°F (327.67°C or 0x7FFF)
 This network variable is subject to the Receive HeartBeat Time,
nviRcvHrtBt.
Outdoor Air
Temperature network input SNVT_temp_p
nviOutdoorTemp
 This input network variable provides outdoor air temperature
information to the thermostat from a network value temperature
value. If a valid value is present, the internal temperature
reading (internal sensor) is no longer used. The device will
automatically display the value on its display when used.
 Valid Range: -40 to 122°F (-40 to 50°C)
 Default Null (release) Value: 621.81°F (327.67°C or 0x7FFF)
 This input network variable is used to command the Space
Comfort Controller into different occupancy modes. It is typically
set by a supervisory node to manually control occupancy
modes, or to override the scheduled occupancy.
 Default Null Value: OC_NUL = 0xFF
 Valid Range:
0 = OC_OCCUPIED
1 = OC_UNOCCUPIED
2 = OC_BYPASS – Not Used
3 = OC_STANDY – Not Used
Occupancy network input
SNVT_occupancy
nviOccManCmd
0xFF = OC_NUL (Release to internal occupancy)**
* OC_OCCUPIED and OC_UNOCCUPIED commands will
always have full authority over the local occupancy routines
of the thermostat may they be a local input or a PIR cover.
** OC_NUL command will release the thermostat to use its
own internal occupancy routine driven by the local
schedule, one of the digital input or a PIR cover installed on
board.
 This network variable input is used to coordinate the Space
Comfort Controller with any node that may need to control the
heat/cool changeover of the unit.
 Default Null Value: HVAC_AUTO.
 This network variable is subject to the receive heartbeat time,
nciRcvHrtBt
 Valid Range:
0 = HVAC_AUTO
1 = HVAC_HEAT
2 = HVAC_MRNG_WRMUP – Not Used
3 = HVAC_COOL
4 = HVAC_NIGHT_PURGE – Not Used
5 = HVAC_PRE_COOL – Not Used
6 = HVAC_OFF
7 = HVAC_TEST – Not Used
8 = HVAC_EMERG_HEAT – Not Used
9 = HVAC_FAN_ONLY – Not Used
12 = HVAC_MAX_HEAT – Not Used
13 = HVAC_ECONOMY – Not Used
14 = HVAC_DEHUMID – Not Used
15 = HVAC_CALIBRATE – Not Used
System
Mode network input SNVT_hvac_mode
nviApplicMode
0xFF = HVAC_NUL – Not Used

8
Parameter Variable Name Function
Occupied
Cool & Heat
Setpoints
network Input
SNVT_temp_p
nviSetpoint
 This input network variable is used to allow the occupied
temperature setpoints only to be changed via the network from a
single analog value. (Note: the Unoccupied setpoints are not
changed). The corresponding heating and cooling values are
derived from the minimum deadband configuration value
 Default Null Value: 621.81°F (327.67°C or 0x7FFF)
 Ex. If the minimum deadband configuration value = 2 °F and
nviSetpoint = 70°F.
• The resulting Occupied heating setpoint will equal 69 °F which is
derived from 70 °F minus ½ the minimum deadband configuration
value of 2 °F
The resulting Occupied cooling setpoint will equal 71 °F which is
derived from 70 °F plus ½ the minimum deadband configuration
value of 2 °F
 This input network variable is used to set the time and date of the
Space Comfort Controller.
 Default Null Value :
Sub Name Valid Range Default Value
1 year 0 to 3000 0
2 month 0 to 12 0
3 day 0 to 31 0
4 hour 0 to 23 0
5 minute 0 to 59 0
Date and
time
network input
SNVT_time_stamp
nviTimeSet
6 second 0 to 59 0

9
Output Network Variables (nvo’s) Description
All output network variables will be updated no faster than the Minimum Send Time (nciMinOutTm)
configuration value, if used.
An output network variable will be transmitted immediately when its value has changed significantly.
Additionally, this variable will also be transmitted as a heartbeat output on a regular basis as dictated by the
Maximum Send Time (nciSndHrtBt) configuration value.
Parameter Variable Name Function
Room
Temperature network output SNVT_temp_p
nvoSpaceTemp
 This output network variable is used to monitor the effective
space temperature sensor that the Space Comfort Controller is
using for control. This output echoes the value of the input.
 Valid Range: -40 to 122°F (-40 to 50°C)
 The value 621.07°F (327.67°C or 0x7FFF) will be sent as an
invalid value in case of a sensor failure.
 This output network variable is available to report the Space
Comfort Controller status. It combines the operating mode, the
capacity of heating and cooling used and an indication if any
alarms are present in the object.
Sub Name Valid Value
01 mode HVAC_HEAT
HVAC_MRNG_WRMUP – Not Used
HVAC_COOL
HVAC_NIGHT_PURGE – Not Used
HVAC_PRE_COOL – Not Used
HVAC_HVAC_OFF
HVAC_HVAC_TEST – Not Used
HVAC_HVAC_EMERG_HEAT – Not Used
HVAC_FAN_ONLY – Not Used
HVAC_MAX_HEAT – Not Used
02: heat_output_
primary 0-100%
03 heat_output_
secondary Not Used
04 cool_output: 0-100%
05 econ_output Not Used
06 fan_output 0-100%
07 In_alarm 0 (No alarms)
1 (Alarm On)
Unit Status
network output SNVT_hvac_status
nvoUnitStatus
0x7FF (Alarming disabled) – Not Used
Outdoor
Temperature network output SNVT_temp_p
nvoOutdoorTemp
 This output network variable is used to monitor the outdoor air
temperature.
 Valid Range: -40 to 122°F (-40 to 50°C)
 The value 621.07°F (327.67°C or 0x7FFF) will be sent as an
invalid value in case of a sensor failure or if unconnected.

10
Parameter Variable Name Function
 This output network variable is used to indicate the actual
occupancy mode of the unit. This information is typically reported
to a supervisory controller or provided to another Space Comfort
Controller to coordinate the operation of multiple units
 Valid Range:
0 = OC_OCCUPIED
1 = OC_UNOCCUPIED
2 = OC_BYPASS1
Occupancy network output
SNVT_occupancy
nvoEffectOccup
3 = OC_STANDBY – Not Used
NOTE : OC_BYPASS can be initiated by either nviOccManCmd or a
local input. NvoEffectOccup will only be in OC_BYPASS for the
duration of the ToccTime (nciGenOpts), until reinitiated by either a
transition of the local input or an update to nviOccManCmd.
 This network variable output is used to report the Space Comfort
Controller inputs’ and outputs’ status.
Name Valid value True Bit Index
fan output 0 = Off
1 = On 2
cooling stage 1 0 = Off
1 = On 3
cooling stage 2 0 = Off
1 = On 4
auxiliary contact 0 = Off
1 = On 5
heating stage 1 0 = Off
1 = On 6
heating stage 2 0 = Off
1 = On 7
di1 direct status 0 = Activated
1 = Not Activated 17
local pir motion 0 = No motion
1 = Motion 24
service alarm 0 = Off
1 = On 12
filter alarm 0 = Off
1 = On 13
fan lock alarm 0 = Off
1 = On 25
set clock alarm 0 = Off
1 = On 22
Thermostat’s
I/O status network output UNVT_thermo_state
_rh
nvoSccStatus
frost protection alarm 0 = Off
1 = On 23

11
Parameter Variable Name Function
This network variable output is used to report the Space Comfort
humidity function’s status
Name Valid value
local humidity level 0 to 100% RH
supply humidity level 0 to 100% RH
effective reset humid setpoint 0 to 100% RH
pi humid demand output 0 to 100% demand
Thermostat’s
I/O status network output UNVT_rh_status
nvoRHStatus
dehumid output active 0 = Dehumidification not active
1 = Dehumidification active
Setpoint network output
SNVT_temp_p
nvoEffectSetpt
 This output network variable is used to monitor the effective
temperature setpoint which may depend on nciSetpoints,
nvoEffectOccup, nviSetpoint and any local setpoint adjustment.
For example, if the occupancy state is unoccupied and the
heat/cool state is heat, the effective setpoint would be equal to
the unoccupied heating setpoint defined in nciSetpoints.
 Valid Range: -40 to 100°F (-40 to 37.5°C)
Local setpoint
output network output
SNVT_temp_p
nvoSetPoint
 This output network variable is used to monitor the space
temperature setpoint
 Valid Range : 40°F to 100°F (4.5°C to 37.5°C)
 The present value is derived by the following
OccHeat Setpoint + ((OccCool Setpoint – OccHeat Setpoint ) / 2)

12
Configuration properties (nci’s) Description
Parameter Variable Name Function
 This configuration property defines the schedule for every day of
the week (from Monday to Sunday or from day 0 to day 6). This
nci is linked with the nvoEffectOccup variable.
 2 or 4 events can entered depending on the nb_of_events
variable.
 Starting and ending time are entered in minutes, e.i. 11:59 pm is
equal to 1439 minutes (23 hours * 60 min + 59 min)
 Valid Range : 0 to 1439 minutes
 Default values:
Sub Name Default Value
1 occupied_event_1 0
2 unoccupied_event_2 1439
3 occupied_event_3 0
Schedule network input config
UNVT_day_sched
nciDay_Sched[x]
x= 0 to 6
4 unoccupied_event_4 1439
 This configuration property defines the space temperature
setpoints for various heat, cool and occupancy modes.
 The stand-by setpoints can be modified but are not used by the
controller, as it does not support Stand-By occupancy mode.
 Valid Range and Default values:
Sub Name Valid Range Default value
01 occupied_cool 54 to 100°F
(12 to 37.5°C) 73.5°F (23°C)
02 standby_cool Not Used Not Used
03 unoccupied_cool 54 to 100°F
(12 to 37.5°C) 82.5°F (28°C)
04 occupied_heat 40 to 90°F
(4.5 to 32°C) 70°F (21°C)
05 standby_heat Not Used Not Used
Temperature
Setpoints network input config SNVT_temp_setpt
nciSetPts
06 unoccupied_heat 40 to 90°F
(4.5 to 32°C) 61°F (16°C)
 This configuration property defines the thermostat’s common
configuration parameters and their settings.
 Valid Range and Default values:
Name Valid Range Default value
password 0 to 1000 0
unoccupied timer 0.5 to 24.0 hours 0.5
anticycle 0, 1, 2, 3, 4, or 5
minutes 2 minutes
power-up delay 10 to 120 sec. 10 sec.
temporary occ time 0, 1, 2, 3 to 12 hours 3 hours
heating stages cph 3, 4, 5, 6, 7 or 8 CPH 4 CPH
cooling stages cph 3 or 4 CPH 4 CPH
heat maximum
setpoint 40 to 90°F (4.5 to 32°C) 90°F
cool minimum
setpoint 54 to 100°F (12 to 37.5°C) 54°F
oa temp heat lockout -15 to 120°F (-26 to
49°C) 120°F
oa temp cool
lockout -40 to 95°F (-40 to 35°C) -40°F
calib room sensor ±5°F (±2.5°C) 0°F
calib outdoor air
sensor ±5°F (±2.5°C) 0°F
Thermostat’s
common
configuration
parameters
network input
config
UNVT_cfg_1_rtu_hp
nciCfg1RtuHp
deadband 2 to 4°F with 1°F
increments (1 to 2°C) 2°F

13
Parameter Variable Name Function
fan mode 0 = On
1 = Auto
2 = Smart
0 = On
fan control 0 = Off
1 = On 1 = On
fan delay 0 = Off
1 = On 0 = Off
keypad lockout 0 = No_Lockout
1 = Level_1
2 = Level_2
No_Lockout
proportional band 2 to 8 F 2 F
temperature units 0 = °C
1 = °F °F
frost protection 0 = Off
1 = On 0 = Off
temperature scale 0 = °C
1 = °F °F
 This configuration property defines the thermostat’s common
configuration parameters and their settings.
Valid Range and Default values:
Name Valid Range Default value
di1 configuration 0 = None
1 = RemNSB
2 = RemOVR
3 = Filter
4 = Service
0 = None
auxiliary contact
configuration 0 = NORMALLY_OPEN 1 = NORMALLY_CLOSE 0 = NORMALLY_OPEN
number of events 2 or 4 2
progressive
recovery enable 0 = Off 1 = Active 0 = Off
number of heating
stages 1 = 1 Stage 2 = 2 Stages 2
number of cooling
stages 1 = 1 Stage 2 = 2 Stages 2
rh frontal display 0 = Off
1 = On Off
humid low reset
temp –40°F up to 15°F (-40°C to –9.5°C) -20.2°F (-29°C)
humid high reset
temp 20°F to 55°F (-6.5°C to 13°C) 32°F (0°C)
dehum lockout
temp –40°F to 122°F (-40°C to 50°C) 32°F (0°C)
humidification high
limit setpoint 50% RH to 90% RH 85% RH
humid low reset rh
setpoint 10% RH to 90% RH 20% RH
dehumidification
hysterisys 2% RH to 20% RH 5% RH
rh sensor
calibration –15% RH to 15% RH 0% RH
humidification
setpoint 10% RH to 90% RH 50% RH
dehumidification
setpoint 15% RH to 95% RH 70% RH
Thermostat’s
common
configuration
parameters
network input
config
UNVT_cfg_3_rtu_hp
nciCfg3RtuHp
dehumidification
lockout function 0 = Off 1 = On 1 = On

14
Parameter Variable Name Function
 This configuration property helps the user identify the type of
equipment being monitored.
 Valid Range:
Value Identifier Name
HVAC Unit-
Type
Identifier
network input config
SNVT_hvac_type
nciHvacType
0
1
2
3
4
5
6
7
8
9
HVT_GENERIC – Not Used
HVT_FAN_COIL
HVT_VAV – Not Used
HVT_HEAT_PUMP
HVT_ROOFTOP
HVT_UNIT_VENT – Not Used
HVT_CHIL_CEIL – Not Used
HVT_RADIATOR – Not Used
HVT_AHU – Not Used
HVT_SLF_CONT – Not Used
Generic
Fan Coil
Variable Air Volume Terminal
Heat Pump
Rooftop Unit
Unit Ventilator
Chilled Ceiling
Radiator
Air Handling Unit
Self-Contained Unit
 This configuration property defines model number and software
version of the thermostat
 Valid Range and Default values:
Sub Name Valid Range Default value
01 Thermostat Model 00 = VT7657B1000E
17 = VT7607B1000E Depend on model being used
Thermostat’s
model number network input config UNVT_model_numbe
r
nciSccModel
02 Software Version Unsigned short Thermostat dependent
Maximum
Send Time network input config SNVT_time_sec
nciSendHrtBt
 This configuration property defines the maximum period of time that
expires before the specified network variable outputs will automatically
be updated
 Valid Range: 0 sec. To 6553.4 sec.. Setting nciSendHrtBt to 0
disables the Send Heartbeat mechanism.
 Default Null Value : 0.0 sec (no automatic update)
Minimum
Send Time network input config SNVT_time_sec
nciMinOutTm
 This configuration property defines the minimum period of time
between automatic network variable outputs transmissions.
 Valid Range: 0 sec. to 6553.4 sec.. Setting nciRcvHrtBt to 0 disables
the Minimum Send Time mechanism.
 Default Null Value : 0.0 sec (no minimum send time)
Minimum
Receive Time network input config SNVT_time_sec
nciRcvHrtBt
 This configuration property is used to control the maximum time that
elapses after the last update to a specified network variable input
before the Space Comfort Controller starts to use its default values.
 Valid Range: 0 sec. to 6553.4 sec.. Setting nciRcvHrtBt to 0 disables
the Receive Heartbeat mechanism.
 Default Null Value : 0.0 sec (no failure detected)
Hardware or
Software
revisions
network input config
SCPT_maj_ver
nciMajVer
 This configuration property defines the major module software
revisions.
 Valid Range: 0 to 255
Hardware or
Software
revisions
network input config
SCPT_min_ver
nciMinVer
 This configuration property defines the minor module software
revisions.
 Valid Range: 0 to 255

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Integration – Global Commands
The following figure shows which objects from the thermostat can be monitored and commanded from the
BAS front-end.
Figure 1: Global commands from a BAS front-end to a VT76x7 series tstat

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Integration – Graphic User Interface (GUI) Objects
The following objects should be typically used in a GUI:
 nvoSpaceTemp
 occupied_heat (nciSetpts);
 unoccupied_heat (nciSetpts);
 occupied_cool (nciSetpts);
 unoccupied_cool (nciSetpts);
 nvoOutdoorTemp
 nvoEffectOccup
 heat_output_primary (nvoUnitStatus)
 cool_output (nvoUnitStatus)
 fan (nvoSccStatus)
 cool_1 (nvoSccStatus)
 cool_2 (nvoSccStatus)
 heat_1 (nvoSccStatus)
 heat_2 (nvoSccStatus)
 Local_RH_level (nvoRHStatus)
 supply_RH (nvoRHStatus)
 effect_reset_RH_setpt (nvoRHStatus)
 PI_demand_humid_output (nvoRHStatus)
 dehumid_active (nvoRHStatus)
 service_alarm (nvoSccStatus)
 filter_alarm (nvoSccStatus)
 d1_direct (nvoSccStatus)
 frostpro_alarm (nvoSccStatus)
Figure 2: Graphical User Interface (GUI) example of a Roof Top Unit with dehumidification
Dehumidification Status (nvoRHStatus)
Supply %RH (nvoRHStatus)
43 %RH
Room %RH (nvoRHStatus) 38 %RH

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Configuration Objects
The following SNVT and UNVT should be typically used for configuration purposes:
 nciCfg1RtuHp;
 nciSetpoints;
 nciCfg3RtuHp;
 nviDaySchedule[0]
 nviDaySchedule[1]
 nviDaySchedule[2]
 nviDaySchedule[3]
 nviDaySchedule[4]
 nviDaySchedule[5]
 nviDaySchedule[6]
Wiring Guide
Overview
For clarity we will use the term “Device” to represent any product with an active Echelon network
connection, including Viconics and non-Viconics controllers.
Summary Specifications:
Parameter Details
Network Wiring 24 to 16AWG, twisted pair
Maximum total wire length11600 feet (500 meters) in free topology
Maximum device-to-device distance 1600 feet (500 meters) in free topology
Polarity Polarity insensitive
Multi-drop Free Topology
Termination for Free Topology Network Segment One RC network with Ra = 52.3Ω±1%, 1/8W
Termination for Doubly Terminated Bus Network
Segment Two RC network with Ra = 105Ω±1%, 1/8W
Number of transceivers per segment Up to 64
Baud rate 78000 bits per second
1Network segment length varies depending on wire type.
Table 1: Summary of Specifications for a Viconics’ EIA-485 Network
Network Configuration
The Echelon network is designed to support free topology wiring and will accommodate bus, star, loop or
any of these topologies. Echelon devices can be located at any point along the network wiring.
Figures 3.1 to 3.5 present five different network topologies. The actual termination circuit will vary by
application.

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Maximum Number Of Devices
Up to 64 transceivers are allowed per network segment. If your network requires more than 64 transceivers a
repeater is then required to extend your network

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Maximum Cable Length
The maximum length of a chain is related to its transmission speed. Using proper cable, Echelon
supports a baud rate of 78 kilobits per second for distances up to 1600-ft (500 m) in free topology and
8800 ft (2700 m) in bus topology with double terminations.
If you require a maximum network length of more than 1600-ft (500 m) or 8800 ft (2700 m), then a
repeater is required to extend the network.
Repeater
In the event that the limits on the number of transceivers or total wire distance are exceeded, a physical
layer repeater can be added to interconnect two or more network segments. A repeater will double the
overall channel capability, including node count and network extent, but not bandwidth. Note that only
one physical layer repeater should be placed in series between any two nodes on a channel. If
additional cabling or network bandwidth is required, then a LonWorks Router should be used in place of
a repeater.
Terminators
Echelon network segments requires termination for proper data transmission performance. The type of
terminator varies depending on whether shielded or unshielded cable is used. Free topology and Bus
networks also differ in their termination requirements. The following sections describe the various terminators
and terminations procedure.
Free Topology Network Segment
In a free topology segment, only one termination is required and may be placed anywhere on the
free topology segment. There are two choices for the termination:
1. RC network with Ra = 52Ω±1%, 1/8W
2. LPI-10 Link Power Interface, with jumper at “1 CPLR” setting.
Doubly Terminated Network Segment
In a doubly terminated bus topology, two terminations are required, one at each en of the bus.
There are two choices for each termination:
1. RC network with Ra = 105Ω±1%, 1/8W
2. LPI-10 Link Power Interface, with jumper at “2 CPLR” setting.
Only one LPI-10 interface is supported per segment. The other terminator must be an RC-type.
Grounding Shielded Twisted Pair Cable
When using Shielded Twisted Pair, terminate the twisted pair as listed in the previous section and
ground the cable shield by using a capacitor, to tie the shield to earth ground, and a large-value
resistor to bleed off any static charge on the shield. Tying the shield to earth ground through a
capacitor will avoid DC and 50/60Hz ground paths from being formed through the shield. Typical
values for resistor and capacitor are as follows:
Capacitor = 0.1μF, 10%, Metalized Polyester, ≥100V
Resistor = 470kΩ, 1/4W, ±5%
The cable shield should be grounded at least once per segment, and preferably at each node.
Grounding the shield at every node will assist in suppressing 50/60Hz standing waves.

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Network Adapter
Although network connections are polarity insensitive, it is good practice to keep polarity consistent
throughout the entire site. Figure 4 shows a network connection example and the location of the Status LED.
This Status LED may help to troubleshoot network problems.
Figure 4: Network connections and location of the Status LED on a LON module
Table 2 shows the different possibilities with the Status LED behavior of the LON module.
Condition of the Status LED Explanation
 Continuously ON The Echelon communication module has no valid application
loaded in its memory.
 Flashing at a rate of 1/2Hz The Echelon communication module has an application
loaded in its memory but is Unconfigured. When an Echelon
communication module is in the unconfigured state, the
application is not running. This is the default state when the
devices are shipped. A network management tool should be
used to configure the module and integrate the device to a
LonWorks network.
 Continuously OFF The Echelon communication module has an application
loaded into its memory and the application is running.
Table 2: Status LED condition
Software Files
XIF: When binding a node onto the network, an XIF file is needed. The XIF file has information that is used
by the network management tool to help ease the installation and maintenance process of a node. It is also
used for offline configuration of the node.
APB and NXE: When running an application program associated with a XIF file, an APB or NXE file is
needed. Please note that the thermostats have the APB file already flashed from the factory.
Device Resource File (DRF): When a LON network management tool is used; a DRF file must be installed.
DRF files are needed to display special manufacturer defined variables or configurations correctly.
• Please note that all release notes for the XIF, APB & NXE software files will be included under
the following folder name on your hard drive: C:\LonWorks\Import\Viconics. The name of the
file is: VT7xxxReadme.txt
Plug-Ins File: Plug-Ins simplify start-up, maintenance, configuration and reduce the installation effort.
• Please note that all release notes for Plug-Ins files will be included under the following folder
name on your hard drive: C:\LonWorks\Plug-Ins\Viconics\VT7xxx. The name of the file is:
Readme.txt.
• All the latest software files can be downloaded from VICONICS’ web site at
http://www.viconics.com