Published by Steven Smethurst July 31st, 2007
in BACnet and Scott Cosby.
The Schedule object is defined by the standard as a periodic schedule of events that may repeat within a range of dates. The schedule object is categorized into two types of days:
Normal Days in a Week
Exception Days
The two types can entail scheduled events for an entire day or portions of a day. The developer may […]
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Published by Steven Smethurst July 24th, 2007
in BACnet and Scott Cosby.
The Command object is a very important part of the operation of a BACnet device. The Command object writes to a group of object properties through action code(s) within the Present_Value property. When this writing occurs, the Command object will start a sequence of actions in the BACnet device(s).
The Command object like the object in […]
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Multi-state objects are very important in operational state description of a BACnet device. There are three types of Multi-state objects described in the BACnet standard:
Multi-state Input
Multi-state Output
Multi-state Value
All three object types use the four required BACnet standard properties. Refer to the article on BACnet Objects by the same author for a more detailed explanation.
The Multi-state […]
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Published by Steven Smethurst July 13th, 2007
in Modbus.
Q: Given hardware, can I write .NET software for the slave device itself? Is the software on slave device embedded C? Some other language I have never heard of? Can it use C#? The reason I ask is because I have been tasked with writing slave software, NOT master software, and only know C#, VB.NET, […]
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Published by Steven Smethurst July 12th, 2007
in Modbus.
Q: We want to check the communication between our device and personal computer, so we need the 232 communication software. Control.com/Q1026236536
A: There are a few free utilities to check communications between your PC and your Modbus device. Try searching Google for Free Modbus Slave utilities. I recomeded that […]
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Published by Steven Smethurst July 11th, 2007
in Modbus.
Q: What is the minimum subset of function that a Modbus salve device should implement?
A: It depend on if you are creating a commercially available slave device or your own slave device.
If you are creating a Modbus Slave device that will only be interrogate by a specific Modbus Master, then you only have to implement […]
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Published by Steven Smethurst July 10th, 2007
in BACnet and Scott Cosby.
BACnet object(s) are concepts that allow the communication and organization of data related to inputs, outputs, software, and calculations to be performed. The BACnet Object can manifest itself in a variety of ways. These ways include:
Single Points
Logical Groups
Program Logic
Schedules
Historical Data
The BACnet object covers both physical and non-physical concepts. For example, a thermostat could be considered […]
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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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CAS Modbus Scanner is a utility to retrieve coils, inputs, holding registers, and input registers from a Modbus enabled device. Values retrieved from the device can be viewed in many different formats including Binary, HEX, Uint16, Int16, Uint32, Int32, and Float32.
This utility is great finding and debugging problems with your Modbus network.
Features:
Can read; coil […]
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Published by Steven Smethurst July 3rd, 2007
in BACnet and Scott Cosby.
The BACnet Notification object is a BACnet Object that is used to send event notifications within a BACnet System. When a device has a problem or a fault, such as the present value of a property rise above a predetermined level, a notification object would be created to inform the rest of the BACnet system […]
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