Published by pchipkin March 28th, 2008
in BACnet MSTP and RS485.
Lets say you adopted all the best practices for installation of the network but you get intermittent or unacceptable performance because of packet loss, noise, collisions … Then you should consider hiring an expert to resolve your problems because now you are in the ‘Art’ part of RS485. These are some of the things they […]
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Published by pchipkin March 27th, 2008
in BACnet MSTP, Cables and RS485.
All cables offer impedance (resistance). Some cables are designed so that the impedance is relatively independent of distance. You want one of these cables. A clue to knowing if you selected one is to look at the cable’s Nominal Impedance. If they quote a number such a 100Ohms you have a good cable. If they […]
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Published by pchipkin March 14th, 2008
in BACnet MSTP and RS485.
How many devices to install on a single RS485 Trunk (Bandwidth Issues). There are non electrical considerations to determine how many devices you put on an MSTP network.
The chart below illustrates (from one installation) how little of the bandwidth is used to transfer data. The APDU’s are application layer message that poll and respond with […]
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Published by Steven Smethurst August 23rd, 2007
in Modbus and RS485.
Chipkin Automation Systems has updated there CAS Modbus Scanner to version 1.00bE.
The changes to the utility has come from comments and requests of ts users, if you have a suggestion or a request that you would like to see in the next version of CAS Modbus Scanner feel free to contact us or leave a […]
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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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Published by Steven Smethurst June 5th, 2007
in Modbus, RS485 and Scott Cosby.
The ModHopper wireless transceiver is a premier, low-cost product for building automation applications developed by the Obvius Corporation that supports Modbus and pulse equipment (i.e. sensors, meters, etc.) along with related networks. The ModHopper transceiver is best suited for energy monitoring in either industrial or commercial structures.
The ModHopper wireless transceiver provides the user with a […]
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Published by Steven Smethurst May 22nd, 2007
in Modbus, Moxa, RS485 and Scott Cosby.
Moxa will soon introduce its new MB3000 series gateways to the market. This series of network gateways includes the MB3180, MB3480, and MB3280. All of these devices offers various specifications and features to the user. The MB3000 series provides conversion between Transmission Control Protocol (TCP) and Remote Terminal Unit (RTU) and ASCII protocol based on […]
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Published by Steven Smethurst May 4th, 2007
in BACnet MSTP and RS485.
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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Published by Steven Smethurst April 13th, 2007
in RS485.
EIA-485 (formerly RS-485 or RS485) is a specification for the physical layer of a network that uses the difference in voltages between two wires (Three wire) to conveys data.
One polarity of voltage indicates a logic 1, the reverse polarity indicates logic 0. The difference of potential must be at least 0.2 volts for valid operation, […]
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Published by Steven Smethurst April 12th, 2007
in BACnet MSTP and 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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