Automated Logic BT485 i-Vu Biasing Terminator Board. Automated Logic BT485 i-Vu Biasing Terminator Board - 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.. Automated Logic. Automated Logic Corporation. BT485. BT485. UPC: . EAN: . GTIN: . ASIN: