Field Instruments

General

The Alerton® BACtalk® Viewport™ is a compact operator terminal for BACnet systems. It connects directly to theMS/TP LAN of a BACnet system and can be wall- or panelmounted.

The Viewport’s easy-to-use keypad and intuitive 4-line by 20-character LCD allow an operator to query and adjust system values.

The communications design and messaging structure of the Viewport comply with ANSI/ASHRAE Standard 135- 1995, BACnet. The Viewport integrates seamlessly with

your BACnet system.

The Viewport provides a low-cost alternative to the BACtalk operator terminal architecture—perfect for smaller installations and buildings where a BACtalk

operator terminal solution is excessive. When the Viewport is combined with an LSi™ Controller, a powerful standalone installation results—energy management features,

scheduling, and DDC are handled in the LSi, with the Viewport providing operator access to view and change most BACnet properties. The Viewport can also operate

without an LSi on the MS/TP LAN. In this case, global DDC and energy management features are not available; the Viewport is used to view and command VLC data and to

host a BACtalk operator terminal connection.

A portable computer running BACtalk for Windows can connect to the Viewport over a simple RS–232 PTP connection for system access, troubleshooting, and Viewport display programming. A BACtalk operator terminal connected to the BACnet internetwork can also be used.

Together with Alerton’s complete BACtalk line of powerful Windows-based operator terminal software and programmable VisualLogic® controllers, the Viewport compact operator terminal offers a total BACnet solution.

Features

• Capable Fully programmable displays can be customized for each site.
• User-friendly 8-button keypad, adjustable backlit LCD, and simple menu structure give occupants and technicians intuitive access to system information.
• Versatile Connects to a BACnet MS/TP LAN. Offers an economical alternative to a PC-based operator terminal for small sites and a convenient access point for larger installations.

Specifications

• Make:  Alerton
• Model: BT-VIEWPORT
• Power: 24 VAC @ 5 VA. Transformer sold separately. Utilizes a half-wave rectifier, which enables the Viewport to share its power supply with other half-wave devices. One leg of 24 VAC connects to earth (panel) ground.
• Processor & Memory: High performance CMOS CPU with 2MB battery backed static RAM and 64K non-volatile EPROM.
• Display: 4-line by 20-character backlit liquid crystal display with 8-button keypad.
• Clock: Real-time quartz crystal clock. Capable of receiving a BACnet time synchronization.
• Battery: Replaceable 3 V, 2/3 A Duracell (DL2450 or equivalent) lithium battery with 1.5 years cumulative capacity. Standby battery life is 10 years.
• Communications: BACnet MS/TP LAN up to 76.8 Kbps.

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