Published by pchipkin March 28th, 2008
in FieldServer and Simplex 4100.
When simplex 4100U’s are networekd together the configuration of a FieldServer needs special considerations.
Follow these steps
1. Use the correct input doc. It must say ‘HW Ref’. This is the only report that can be used.
2. Use the HW Ref column to work out which card-point-subPoints you need to capture in the configuration.
You will need one Map […]
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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 19th, 2008
in BACnet MSTP and Cables.
Practically speaking you can go up to 4000 feet (1200m) at baud rates up to 76800 baud. Above that you need to do a little math and reduce the length. For example, at 115k baud your cable should not be much longer than 2500 feet.
However, the higher the baud rate the more sensitive the cable is […]
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Published by pchipkin March 18th, 2008
in BACnet and BACnet MSTP.
Data inside a BACnet device is organized as a series of objects. Each object has a type and a set of properties. There is always at least one object in a device – it is used to represent the device itself . The other objects represent the device’s data.
In practical terms think of a simple […]
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Published by pchipkin March 17th, 2008
in BACnet and BACnet MSTP.
All devices on a BACNet network are effectively peers. This means that any device (we take device here to mean any Bacnet capable entity – device or software application) can write to the writable properties of another device’s objects. This can result in conflicting commands.
BACnet has a mechanism to resolve the conflict. It differentiates between […]
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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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