Archive for the 'BACnet MSTP' Category



Free Tool: CAS BACnet Explorer

CAS BACnet Explorer is the perfect utility for exploring, testing and debugging BACnet® networks and devices.

Exploring - Automatically discover all the BACnet® IP, BACnet® Ethernet and BACnet® MSTP devices, objects, and there properties on your network. The objects and devices are arranged in an easy to use tree format with braches for each network, object, […]

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The BACnet Protocol

BACnet is described by experts in the field as a data communication protocol for Building Automation and Control networks. Previous products were not able operate within another developer’s system or device. This aspect is referred to as interoperability. During the late 1980s, members of the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) […]

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FieldServer Technologies ProtoCessors

FieldServer Technologies has produced low-cost, quality ProtoCessors for the automation industry. ProtoCessors are Industrial Communication Protocol (ICP) modules with a standard interface. FieldServer ProtoCessors provide original equipment manufacturers (OEMs) expeditious implementation of various industrial, machine, and building automation protocols for the end-user.
The ProtoCessors are composed of an embedded system on a single board with an […]

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2 BACnet MSTP devices with the same device ID

I was ask this question to day
What would happen if you had two BACnet MSTP devices with different MAC address but the same BACnet Device ID (Node ID) on the same network and you send a Broadcast Who-is message.
This would be an illegal configuration ( no two devices shall have the same Device ID..) but […]

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RS485 Cables - Why you need 3 wires for 2 (two) wire RS485

RS485 needs 3 conductors and a shield. Many people say its a two wire network but it is not.
Two conductors are used to carry the RS485 Differential voltage signal.
The Shield is connected to earth/ground at one end only and provides shielding against induced noise.
So why the 3rd conductor ?
The driver sends data by modulating the […]

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