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AG-BASRTB00-BD0 Page 3

Application Guide — BASrouters

T R L SO

CONTEMPORARY

Application #2 — Connecting Together BACnet’s Automation and Field Levels

One advantage of BACnet is that the same protocol

can operate at both the automation level, and the

eld level where the eld controllers are operating.

The automation devices are BACnet/IP compatible

operator workstations (B-OWS) and building controllers

(B-BC) while the eld devices are application specic

controllers (B-ASCs). In order to interconnect these

two levels, a BASrouter is needed. On the BACnet/

IP side, the BASrouter can operate up to 100 Mbps

while supporting both auto-negotiation and Auto-MDIX.

On the MS/TP side, baud rates up to 76.8 kbps are

supported — 115.2 kbps on the BASrouterLX. Notice

that multiple BASrouters can reside within the same

BACnet internetwork. A cluster of MS/TP devices

located at distant parts of a building can be connected

to the same BACnet/IP network but at different

locations using separate BASrouters. This could be a

more convenient solution than using EIA-485 repeaters

to extend MS/TP networks especially if the MS/TP

devices cannot all operate at the same baud rate.

Using repeaters with auto-bauding MS/TP devices can

also be tricky.

BACnet MS/TP Network 1 BACnet MS/TP Network 2

BACnet/IP Network 3

Conguration

Router 1

Conguration

Router 2

Conguration

1 2 3 4 5 6 7 8 ... 19 20

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Contemporary-control-systems BASrouter Application Guide Manuale Utente Pagina 3