Delta Controls DNS-24 - User Manual

Document Edition 4.2 Page 1 of 43
APPLICATION GUIDE
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
NETWORK COMMUNICATIONS ........................................................................................................... 2
DEVICE CONFIGURATION (KEYPAD) .................................................................................................. 2
SERVICE TOOL MODE (KEYPAD) ....................................................................................................... 7
INPUT CALIBRATION .......................................................................................................................... 8
INPUT SCALE RANGES ...................................................................................................................... 8
SOFTWARE & PROGRAMMING...................................................................................................... 9
OBJECTS............................................................................................................................................ 9
PROGRAMMING ............................................................................................................................... 12
CONTROL FUNCTIONS ................................................................................................................... 13
OVERVIEW ...................................................................................................................................... 13
SOFTWARE LOOP CONTROLLER ....................................................................................................... 15
SETPOINTS ...................................................................................................................................... 19
CONTROL DIAGRAM ........................................................................................................................ 20
CONTROL APPLICATIONS (MUX, VAV, VVT, HPU, FCU, RAD, HUM) ............................................ 21
OUTP UT FUNCTIONS & TYPES ......................................................................................................... 29
OWS FUNCTIONS .............................................................................................................................. 34
APPENDIX A: PROGRAMMING NOTES .................................................................................................... 31
APPENDIX B: LINKNET ......................................................................................................................... 32

Delta Controls DNS-24 Specifications

General

Brand	Delta Controls
Model	DNS-24
Category	Accessories
Language	English

Summary

Product Description

Important Information

V3.22 Firmware & Software or Higher

Discusses firmware and software compatibility for BACstats.

Setup & Configuration

Device Configuration

Covers user access, menu navigation, and options for device setup.

Service Tool Mode (Keypad)

Service Tool Menu Options

Details the main and air balancer menu options available in Service Tool Mode.

Input Calibration & Scale Ranges

MS;TP Connection

Describes input calibration for MS/TP connections, including local calibration.

Software & Programming

Objects

Lists predefined objects accessible over the MS/TP network.

Inputs

Sensor Details

Details humidity, CO2, and motion sensor inputs, their availability, and handling.

System Events and Statistics

System Log (AV35)

Lists event codes and descriptions for the system log, detailing device events.

Programming & Control Functions

Control Applications Overview

Lists and describes available built-in control strategies and operating modes.

Software Controller Loop

Controller Operation and Parameters

Outlines controller parameters, operation, staging, and reset actions.

Setpoints

Setpoint Configuration

Details configuration of day, night, minimum, maximum, and differential setpoints.

Control Applications

Application Details

Describes specific control applications like VAV, VVT, HPU, FCU, and Humidity.

Output Functions & Types

OWS Configuration

Device Configuration and Settings

Covers device configuration, settings, and copying configurations via OWS.

Output Configuration Types

Details output types like PWM, Time Proportioned, Tri-State, and Fan control.

Navigator Commands and File Operations

Describes navigator commands, loading, and saving BACstat configuration files.

Appendix A: Programming Notes

Programming Best Practices

Covers programming notes for variables, priority, and keypress resets.

Appendix B: LINKnet

LINKnet Configuration and Objects

Details LINKnet configuration, calibration, limitations, and object access.

GCL++ Programming for LINKnet

Explains GCL++ programming, LCD object properties, and temperature units for LINKnet.

LINKnet Programming Notes & Examples

Provides programming notes, examples, and keypress value lists for LINKnet.