DNT-T103 & DNT-T221 Application Guide
Page 12 of 41
Document Edition 4.1
PROGRAMMING
Objects
MS/TP CONNECTION
All of the existing predefined BACstat II objects are readily accessible over the MS/TP network.
Control Applications
BACstats with I/O may be configured to run one of six possible built-in control applications.
Another option disables local control altogether.
GCL+ Programming
BACstats are not programmable devices – GCL+ does not reside in a BACstat. Rather, when
connected to an MS/TP network you configure a BACstat for local operation and write GCL+
located elsewhere as necessary to do additional functions. In this way you configure the BACstat for
local operation (both display & button handling and local control) and then write any necessary
GCL+ in another controller for additional strategies.
For example: Through the Configuration Menu, you typically configure the BACstat II display and
buttons to functional locally, so GCL+ programs are not necessary for handling the display value or
adjusting setpoint (i.e., AV15 = 1237). You may also select a suitable control application for local
control. Then, using GCL+ programming located in another controller (i.e., DCU or other System
Device) you make mode and setpoint changes based on Time-of-Day or other conditions.
W
ITH
V3.21
F
IRMWARE
: All GCL+ programming for mode changes (DCU, DSC or DAC), data
exchange, and other strategies must be written in the DCU.
W
ITH
V3.22
F
IRMWARE OR
H
IGHER
: GCL+ programming for mode changes, or other strategies may
be written in any appropriate controller on the network.
Refer to the Programming Notes in
of this document, and also the appropriate
Appendix within the
ORCAview Technical Reference Manual
for further programming information.
Control Functions
OVERVIEW
1.
C
ONTROL
A
PPLICATIONS
When connected to an MS/TP network, the BACstat may configured to operate according to one of 7
possible application control strategies, and displayed in the Application variable (AV12).
Application
Description
AV12
None (MUX)*
Provides remote control of the outputs from another device.
0
VAV
Provides control of a simple VAV box and optional fan.
1
VVT
Provides control of a simple VVT box and optional fan.
2
HPU
Provides control of a Heat Pump Unit with a reversing valve and a fan.
3
FCU
Provides control of a Fan Coil Unit with heating/cooling and a fan.
4
Unit Heater
No longer supported. Use FCU instead.
Radiation/Reheat
Provides control of single or multi-stage heating with no fan.
5
Humidity
Provides control of a Humidifier and assumes a model of the BACstat
with a humidity sensor. (DNT-H103B and DNT-H121B)
6
