PT-Link II N2-3 Interface
PT-Link II N2-3
®
Technical Guide
27
Appendix C - VCM-X N2 Parameters
N2 Properties for the VCM-X Controller
Parameter
Name
Object
Description
Limits
Alarm
Status
AlrmSts
AI: 1
Needed only in
legacy application.
Control
Status
CtrlSts
AI: 4
Current operational
status.
Occupied
Mode
Enable
Cooling
Setpoint
Mirror
ClSt
AI: 7
Occupied Mode
Enable Cooling
Setpoint Mirror.
Control
Temperature
CtrlTp
AI: 9
Current value of the
control temperature
sensor.
Duct Static
Pressure
DuctPr
AI: 14
Current value of the
duct static pressure
sensor.
Economizer
Position
EcoPos
AI: 16
Current position
of the economizer
damper.
Occupied
Mode
Enable
Heating
Setpoint
Mirror
HtSt
AI: 31
Occupied Mode
Enable Heating
Setpoint
Mirror.
Modulating
Gas Valve
Position
MdHt-
2Pos
AI: 38
Current position
of MODGAS II
modulating gas
valve control.
On Board
Relays
OnRlys
AI: 44
Needed only in
legacy application.
Outdoor Air
Dewpoint
OaDwpt
AI: 47
Current calculated
outdoor air
dewpoint added on
version 1.09.
Outdoor Air
Humidity
OaRh
AI: 52
Current value of the
outdoor humidity
sensor.
Outdoor Air
Temperature
OaTp
AI: 54
Current value of the
outdoor tempera-
ture sensor.
Outdoor Air
Wetbulb
OaWtbl
AI: 55
Current calculated
value of the out-
door wetbulb
temperature.
N2 Properties for the VCM-X Controller
Parameter
Name
Object
Description
Limits
Reheat
Value
Position
Rt2Pos
AI: 60
Current position of
MHGRV modulat-
ing hot gas reheat
valve control.
Relief
Pressure
RfPr
AI: 62
Current value of the
building pressure
sensor.
Return Air
Temperature
RaTp
AI: 64
Current value of the
return temperature
sensor.
Indoor
Humidity
InRh
AI: 67
Current value of
the indoor humidity
sensor.
Space
Temperature
SpcTp
AI: 72
Current value of the
space temperature
sensor.
Current
Supply Air
Setpoint
SaTpStM
AI: 82
Current SAT
Cooling or Heating
setpoint if there
is no reset source;
Current calculated
SAT setpoint with
Reset Source.
Supply Air
Temperature
SaTp
AI: 83
Current value of the
supply air
temperature sensor.
Temperature
Demand
TpDmnd
AI: 84
Based on the
comparison
between the
current Control
Temperature and
the Heating or
Cooling Setpoint
Temperatures. Does
not work for supply
air control
VFD
Blower Fan
VfdBw-
Pos
AI: 88
Current position of
the VFD blower fan
signal.
VFD
Relief Fan
VfdExPos
AI: 89
Current position of
the VFD relief
fan signal.
Application
Software
Version
AppVer
AI: 99
Current version of
the software in the
unit.
Alarm
Group 1
AlrmGrp1
AI: 104
Needed only in
legacy application.
Alarm
Group 2
AlrmGrp2
AI: 105
Needed only in
legacy application.
Alarm
Group 3
AlrmGrp3
AI: 106
Needed only in
legacy application.
Dewpoint
Setpoint
Mirror
DptStM
AI: 110
Mirror of the DPtSt
“read only.”
External
Relays 1-2
ExRlys12
AI: 111
Needed only in
legacy application.
External
Relays 3-4
ExRlys34
AI: 112
Needed only in
legacy application.
NOTE:
When a new setpoint is received from N2, it is main-
tained and used in temporary memory until the unit goes
unoccupied. It is then stored in permanent memory and
will become the new default setpoint even if power is
cycled. Therefore, if power is cycled prior to the unit
going unoccupied, the setpoint will not have been stored
in permanent memory.
NOTE:
Objects labeled AI and BI are read-only. Objects labeled
AO are read/writeable. You cannot write directly to Sensor
Inputs.
