Document Edition 4.2
Page 1 of 43
A
PPLICATION
G
UIDE
Delta Network Sensor / Thermostat: BACstat II
DNS-24, DNT-T103 & DNT-T221
Document Edition 4.2
Product Description
The BACstat II is a line of network room sensors/thermostats with a custom
LCD display and pushbutton interface. They can communicate directly on a
BACnet MS/TP network or Delta’s proprietary LINKnet network.
They are capable of displaying a wide-range of digital or analog values,
including setpoints, temperature, air flow, heating and cooling status, fan
speed, valve and damper position, and more. When connected on a BACnet
MS/TP network they function as independent BACnet sensors or thermostats.
When connected to a Controller on a LINKnet network they provide
programmable remote sensor and expanded I/O capabilities. BACstats that are
hardware revision 4 or greater can be flash loaded over the network, and have
termination resistors that are jumper selectable.
The DNS-24 models are network sensors they have multiple onboard sensor options including temperature
humidity, CO2 and motion, but do not have any outputs or internal control algorithms. The DNT-T103 has 1
extra input, 3 binary outputs and a number of built-in application control strategies. The DNT-T221 has 2
extra inputs, 2 analog and 1 binary output and built-in application control strategies. As a result, DNT
BACstats are capable of stand-alone control when directly connected on an MS/TP network.
Contents
OTHER
RELEVANT
DOCUMENTS .................................................................................................. 2
IMPORTANT
INFORMATION .......................................................................................................... 2
SETUP
&
CONFIGURATION ............................................................................................................. 2
N
ETWORK
C
OMMUNICATIONS
........................................................................................................... 2
D
EVICE
C
ONFIGURATION
(K
EYPAD
) .................................................................................................. 2
S
ERVICE
T
OOL
M
ODE
(K
EYPAD
) ....................................................................................................... 7
I
NPUT
C
ALIBRATION
.......................................................................................................................... 8
I
NPUT
S
CALE
R
ANGES
...................................................................................................................... 8
SOFTWARE
&
PROGRAMMING...................................................................................................... 9
O
BJECTS
............................................................................................................................................ 9
P
ROGRAMMING
............................................................................................................................... 12
CONTROL
FUNCTIONS ................................................................................................................... 13
O
VERVIEW
...................................................................................................................................... 13
S
OFTWARE
L
OOP
C
ONTROLLER
....................................................................................................... 15
S
ETPOINTS
...................................................................................................................................... 19
C
ONTROL
D
IAGRAM
........................................................................................................................ 20
C
ONTROL
A
PPLICATIONS
(M
UX
,
VAV,
VVT,
HPU,
FCU,
R
AD
,
H
UM
) ............................................ 21
O
UTP UT
F
UNCTIONS
&
T
YPES
......................................................................................................... 29
OWS
FUNCTIONS .............................................................................................................................. 34
A
PPENDIX
A:
P
ROGRAMMING
N
OTES
.................................................................................................... 31
A
PPENDIX
B:
LINK
NET
......................................................................................................................... 32
