PT-Link II N2-3 Interface
PT-Link II N2-3
®
Technical Guide
37
Appendix E - VCM N2 Parameters
N2 Parameters for the VCM Controller
Parameter
Name
Object
Description
Limits
Application
Software
Version
AppVer
AI: 99
Current version of the
software in the unit.
Alarm
Status
AlrmSts
AI: 1
Needed only in legacy
application.
Unit Mode
UnitMode
AI: 123
Needed only in legacy
application.
Control
Status
CtrlSts
AI: 4
Current operational
status.
Control
Temperature
CtrlTp
AI: 9
Current value of the
control temperature
sensor.
Occupied
Mode
Enable
Cooling
Setpoint
Mirror
ClSt
AI: 7
Occupied Mode
Enable Cooling
Setpoint
Mirror.
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.
External
Relays 1-2
ExRlys12
AI: 111
Needed only in legacy
application.
External
Relays 3-4
ExRlys34
AI: 112
Needed only in legacy
application.
Indoor
Humidity
InRh
AI: 67
Current value of the
indoor humidity sensor.
Occupied
Mode
Enable
Heating
Setpoint
Mirror
HtSt
AI: 31
Occupied Mode
Enable Heating Setpoint
Mirror.
On Board
Relay
OnRlys
AI: 44
Needed only in legacy
application.
Outdoor Air
Humidity
OaRh
AI: 52
Current value of the out-
door humidity sensor.
Outdoor Air
Temperature
OaTp
AI: 54
Current value of the out-
door temperature sensor.
Outdoor Air
Wetbulb
OaWtbl
AI: 55
Current calculated value
of the outdoor wetbulb
temperature.
Relief
Pressure
RfPr
AI: 62
Current value of the
building pressure sensor.
N2 Parameters for the VCM Controller
Parameter
Name
Object
Description
Limits
Return Air
CO
2
Level
CO2Level
AI: 150
Current value of
the CO
2
sensor.
Return Air
Temperature
RaTp
AI: 64
Current value of
the return tempera-
ture sensor.
Space
Temperature
SpcTp
AI: 72
Current value of
the space tempera-
ture sensor.
Supply Air
Temperature
SaTp
AI: 83
Current value of
the supply air
temperature sensor.
Temperature
Demand
TpDmnd
AI: 84
Based on the com-
parison between
the current Control
Temperature and
the Heating or
Cooling Setpoint
Temperatures.
Does not work for
supply air control.
VFD
Blower Fan
VfdBwPos
AI: 88
Current position
of the VFD blower
fan signal.
VFD Relief
Fan
VfdExPos
AI: 89
Current position of
the VFD relief
fan signal.
Modulating
Gas Valve
Position
MdHt2Pos
AI: 38
Current position
of MODGAS II
modulating gas
valve control.
Reheat
Value
Position
Rt2Pos
AI: 60
Current position of
MHGRV
modulating hot
gas reheat valve
control.
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.”
Indoor RH
Setpoint
Mirror
InRhStM
AI: 114
Mirror of the
InRhSt “read only.”
Modulating
Cool
Position
MdClPos
AI: 115
Current position of
the modulating
cooling signal
(Chilled water or
digital compressor).
Modulating
Heat
Position
MdHtPos
AI: 116
Current position of
the modulating
heating signal
(hot water or SCR
heat).
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.
