i-Vu® Biasing Terminator

BMS & Control Carrier i-Vu Building Automation Controllers
i-Vu® Biasing Terminator
Networking and Integration

i-Vu® Biasing Terminator

Reliable network termination for stable BACnet MS/TP communication
The i‑Vu® Biasing Terminator (BT485) ensures dependable BACnet MS/TP network performance by properly terminating and biasing RS‑485 network segments, reducing communication errors caused by noise, reflections, and signal distortion.

i-Vu® Biasing Terminator

Network Device
Carrier's ancillary network devices ensure optimum performance for BACnet MS/TP and other EIA-485 networks. These devices install easily and work together to amplify data signals and provide surge protection, bias and termination to any EIA-485 network.

i-Vu® Biasing Terminator

Improved Network Signal Integrity

Prevents end‑of‑line reflections, electrical noise, and signal distortion on RS‑485 networks.

Proper Network Biasing

Maintains stable voltage levels on idle communication lines for reliable data transmission.

Simple Installation

Compact, plug‑in design allows quick installation at network endpoints.

Designed for MS/TP Networks

Optimized for use with BACnet MS/TP communication trunks.

Network Requirement

One terminator required at each end of a network segment longer than 10 ft (3 m)

Operating Temperature

‑20°F to 140°F (‑29°C to 60°C)

Physical Dimensions

0.5 in (12 mm) width
0.6 in (15 mm) height

Application Type

RS‑485 / BACnet MS/TP network termination and biasing device

Document Name Description Document Type Language Action
Installation Guide Open Controller Network Wiring Guide PDF English Download
Product Data i-Vu Open Network Devices Product Data Sheet PDF English Download
What problem does the BT485 solve?

It stabilizes RS‑485 networks by preventing signal reflections and electrical noise that can cause communication errors.

Where should the BT485 be installed?

It should be installed at each end of a BACnet MS/TP network segment longer than 10 feet.

Is the BT485 required on every controller?

No. Only the first and last devices on a network segment require a biasing terminator.

Does the BT485 require power?

No. It is a passive device and does not require an external power source.

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