Midac
Encyclopedia
MIDAC is an acronym created in 1981 by a Sydney
-based business, Combined Resources Computing (CRC). It stands for Microprocessor Intelligent Data Acquisition and Control. CRC was established in order to complete several building automation projects commenced by R-Tec.
R-Tec was an Australian development company based in Sydney that focussed on designing innovative computerised building automation products. The proprietors formed R-Tec in the late 1970s after leaving Johnson Controls. The early R-Tec automation systems used TTL logic with control parameters stored in dynamic memory.
The early computerised building automation
systems or BAS monitored alarms and conditions relating to building services including air conditioning, water and power, etc. They also controlled plant by starting and stopping pumps and fans according to time and other interlock conditions.
The systems of the 1970s and early 1980s used parallel or multiple conductor communications data busses to communication with Data Gathering Panels (DGPs) located throughout the building. The DGPs would communicate monitored conditions using multiplex techniques back to a central location and "front end" system through the parallel data trunk. In the same way commands to start and stop plant would be sent from the front end to the DGP and then to the machine. All decisions or "intelligence" was centrally located, and the DGPs simply relayed information.
Combined Resources Computing was established by Kevin Johnson-Bade, an ex R-Tec software engineer, with the prime goal of completing the building automation system contracted to R-Tec by the University of Melbourne
. This occurred when R-Tec closed down, being unable to complete its contractual commitments.
The University of Melbourne building automation system was ambitious. In 1982 it was possibly the first successful implementation of a distributed intelligence building automation or Direct Digital Control
or DDC system using Z80 microprocessors. Remote units called Satellite Intelligence Units (SIUs) were located in buildings around the campus and were connected to the front end using a serial communications. See: Distributed control system
CRC developed a unique object-oriented
control algorithm building approach. Even though the Z80 microprocessor of the time ran at only 1 MHz, and had a memory addressing range of 64 Kbytes, the University of Melbourne system out-performed other automations systems of the time significantly. CRC created a front-end computer that used ten processors to share the task, having access to up to 256 pages of shared memory. Each SIU used two Z80 processors. This allowed the intelligence to be shared, and many decisions to be made locally thus further reducing the load on the front end and reducing communications.
The University of Melbourne system was a leader in the development of distributed intelligence DDC system.
Out of CRC Midac System Pty Limited was formed in 1982, and went on to develop and implement more leading DDC technology included systems where the front-end computer was a CPM operating system MZ3500 Sharp personal computer. The Sharp was chosen because of its much superior graphics compared with the early IBM PC of the early 1980s.
Over the following years the major players like Johnson and Honeywell would follow, replacing their mini-computer front-end terminals with PCs as they implemented microprocessor-based distributed intelligence systems using serial communications networks. Toward the end of the 1980s and early 1990s most DDC systems included an object-oriented control algorithm building tool. They compiled the object-oriented instructions into the system's native proprietary linear language, whereas in the Midac approach the control system's native language or operating environment was itself object-oriented.
Midac went on to develop three new generations of microprocessor-based DDC systems, the last version being Nexus, developed for DKS that was taken over by James Hardie's Building Automation division. That business and its assets including Nexus were purchased by Chubb International in the late 1990s.
1982 Developed innovative Object Oriented Control Algorithm Building Language
1982 Implemented one of the world’s first Distributed DDC Systems
1983 Pioneered Full DDC (Direct Digital Control) Energy Management Systems
1985 Provided First Full DDC Teaching System for TAFE
1988 - 1989 Designed and released Australia's first Home Automation technology
1990 - 1992 Developed Nexus - AI DDC system modeled on the human body
1995 Early WWW Political "Vote". First use of CyberVote term see Electronic voting examples
1995 Pioneered early Online Business Gateway/Portal sites in Australia
1998 eCommerce Gateway using Application Service Provider approach
2002 Released GatewayEngine, ReceptionCounter and RingForHelp products
2003 - 1010 YesBookit - the first online booking management system for real estate agents
Sydney
Sydney is the most populous city in Australia and the state capital of New South Wales. Sydney is located on Australia's south-east coast of the Tasman Sea. As of June 2010, the greater metropolitan area had an approximate population of 4.6 million people...
-based business, Combined Resources Computing (CRC). It stands for Microprocessor Intelligent Data Acquisition and Control. CRC was established in order to complete several building automation projects commenced by R-Tec.
R-Tec was an Australian development company based in Sydney that focussed on designing innovative computerised building automation products. The proprietors formed R-Tec in the late 1970s after leaving Johnson Controls. The early R-Tec automation systems used TTL logic with control parameters stored in dynamic memory.
The early computerised building automation
Building automation
Building automation describes the functionality provided by the control system of a building. A building automation system is an example of a distributed control system...
systems or BAS monitored alarms and conditions relating to building services including air conditioning, water and power, etc. They also controlled plant by starting and stopping pumps and fans according to time and other interlock conditions.
The systems of the 1970s and early 1980s used parallel or multiple conductor communications data busses to communication with Data Gathering Panels (DGPs) located throughout the building. The DGPs would communicate monitored conditions using multiplex techniques back to a central location and "front end" system through the parallel data trunk. In the same way commands to start and stop plant would be sent from the front end to the DGP and then to the machine. All decisions or "intelligence" was centrally located, and the DGPs simply relayed information.
Combined Resources Computing was established by Kevin Johnson-Bade, an ex R-Tec software engineer, with the prime goal of completing the building automation system contracted to R-Tec by the University of Melbourne
University of Melbourne
The University of Melbourne is a public university located in Melbourne, Victoria. Founded in 1853, it is the second oldest university in Australia and the oldest in Victoria...
. This occurred when R-Tec closed down, being unable to complete its contractual commitments.
The University of Melbourne building automation system was ambitious. In 1982 it was possibly the first successful implementation of a distributed intelligence building automation or Direct Digital Control
Direct Digital Control
Direct digital control is the automated control of a condition or process by a digital device .A very early example of a DDC system meeting the above requirements was completed by the Australian business Midac in 1981-1982 using R-Tec Australian designed hardware...
or DDC system using Z80 microprocessors. Remote units called Satellite Intelligence Units (SIUs) were located in buildings around the campus and were connected to the front end using a serial communications. See: Distributed control system
Distributed control system
A distributed control system refers to a control system usually of a manufacturing system, process or any kind of dynamic system, in which the controller elements are not central in location but are distributed throughout the system with each component sub-system controlled by one or more...
CRC developed a unique object-oriented
Object-oriented programming
Object-oriented programming is a programming paradigm using "objects" – data structures consisting of data fields and methods together with their interactions – to design applications and computer programs. Programming techniques may include features such as data abstraction,...
control algorithm building approach. Even though the Z80 microprocessor of the time ran at only 1 MHz, and had a memory addressing range of 64 Kbytes, the University of Melbourne system out-performed other automations systems of the time significantly. CRC created a front-end computer that used ten processors to share the task, having access to up to 256 pages of shared memory. Each SIU used two Z80 processors. This allowed the intelligence to be shared, and many decisions to be made locally thus further reducing the load on the front end and reducing communications.
The University of Melbourne system was a leader in the development of distributed intelligence DDC system.
Out of CRC Midac System Pty Limited was formed in 1982, and went on to develop and implement more leading DDC technology included systems where the front-end computer was a CPM operating system MZ3500 Sharp personal computer. The Sharp was chosen because of its much superior graphics compared with the early IBM PC of the early 1980s.
Over the following years the major players like Johnson and Honeywell would follow, replacing their mini-computer front-end terminals with PCs as they implemented microprocessor-based distributed intelligence systems using serial communications networks. Toward the end of the 1980s and early 1990s most DDC systems included an object-oriented control algorithm building tool. They compiled the object-oriented instructions into the system's native proprietary linear language, whereas in the Midac approach the control system's native language or operating environment was itself object-oriented.
Midac went on to develop three new generations of microprocessor-based DDC systems, the last version being Nexus, developed for DKS that was taken over by James Hardie's Building Automation division. That business and its assets including Nexus were purchased by Chubb International in the late 1990s.
History
1981-1983 Developed Concurrent Processing Multi-user DDC "Super Computer"1982 Developed innovative Object Oriented Control Algorithm Building Language
1982 Implemented one of the world’s first Distributed DDC Systems
1983 Pioneered Full DDC (Direct Digital Control) Energy Management Systems
1985 Provided First Full DDC Teaching System for TAFE
1988 - 1989 Designed and released Australia's first Home Automation technology
1990 - 1992 Developed Nexus - AI DDC system modeled on the human body
1995 Early WWW Political "Vote". First use of CyberVote term see Electronic voting examples
Electronic voting examples
The following is a list of examples of electronic voting from elections around the world. Examples include polling place voting electronic voting and Internet voting.-Origin:...
1995 Pioneered early Online Business Gateway/Portal sites in Australia
1998 eCommerce Gateway using Application Service Provider approach
2002 Released GatewayEngine, ReceptionCounter and RingForHelp products
2003 - 1010 YesBookit - the first online booking management system for real estate agents