ModBUS DNT-T305-H2A Building Automation Contoller

The DNT-T305 is a fully programmable, Native BACnet™ Advanced Application Controller that communicates on an RS-485 LAN using the BACnet MS/TP protocol. The DNT-T305’s attractive housing includes a LCD display with a wide-angle view and an intuitive keypad.


The DNT-T305 is suitable for various room applications with small I/O requirements such as Fan Coil Units, Unit Ventilators and Heat Pumps. Because of its programming capability, the DNT-T305 can be used to create or modify GCL+ programs and BACnet objects for specific applications.


  • Native BACnet firmware
  • BACnet MS/TP communications
  • Attractive wall-mount housing
  • 4/8/16 button keypad
  • Fully programmable in GCL+
  • Application database can be loaded over the network
  • Controller firmware can be flash loaded over the network
  • Derived Network Addressing (DNA) for simple integration into a standard network architecture
  • Service port

BACnet Device Profile

BACnet Advanced Application Controller



Large font 4-digit alpha numeric display (for time, object value or units)

Small font 4-digit alpha numeric display (for time or units display)

12-digit alpha numeric display (for object names, menu commands or options)

10 display icons representing different functions


4, 8 or 16 buttons (suitable for different applications)

Security door

Temperature Sensor

Thermistor input - 10k½ at 77°F (25°C)

Accuracy +/-0.4°F from 32-158°F (+/- 0.2°C from 0-70°C)

Display resolution of 0.1°

Stability 0.24°F over 5 years (0.13°C)

External Inputs

3 Universal inputs - 10 bit (supporting 0-5v, 0-10v, 10k½)

External Outputs

5 Binary FET outputs (AC or DC switching or PWM)

Jumper selection for internal or external power on binary outputs


32-bit processor

1 MB (8 megabit) Flash memory

128 KB SRAM memory for database

CPU Status LED

Device Addressing

Set via keypad configuration setup or software setup

Communications Ports

Main LAN (NET1)

BACnet MS/TP @ 9600, 19200, 38400 or 76800 bps (default) (maximum of 99 devices per BACnet MS/TP segment)

SubLAN (NET2) None with this model


AMP plug-in terminal connectors


Class 2


24 VAC

5VA, 65VA with BOs fully-loaded


32° - 131°F (0° - 55°C)

10 - 90% RH (non-condensing)


5 3/4 x 4 1/4 x 1 1/4 in. (14.7 x 10.9 x 3.8 cm) with housing

0.50 lb. (240 g) with housing





UL 916 Listed

BTL Listed

  • Programmable
  • Local User Interfaces