Modular microprocessor system for collection and processing of
information from analogue and digital sensors
(OKTOPORT)
1.
2.
3.
4.
5.
6.
System purpose.
Basic modules.
Technical characteristics.
Architecture of information net.
Software.
Applications.
1. System purpose
The main task of smart information systems is collecting information from
different (analogue and digital) sensors and further information processing.
The large number of sensors, communications interfaces and necessity of
short distance measurement request a developing of modular microprocessor
system with network structure.
OKTOPORT is developed to satisfy these requirements. The system is
realized on smart technology and it is flexibility and multi functional.
The basic purpose is collecting and processing of from temperature sensors
in width range of measured temperatures; measurement from devises where the
output signal is analogue (power) or digital. There are included tools for digital
output management using special chips (electronic switches).
OKTOPORT is suitable for distributed systems realizing for information
collecting and information processing from distant devises.
The specialized software includes:
¾ processing programs;
¾ programs for monitoring and documentation;
¾ programs for Internet;
¾ distributed data base.
2. Basic modules
OKTOPPORT includes the following basic modules:
¾ RS485/422 – communication module, transforming interface
RS232 in RS485 or RS422;
¾ OKTOPPORT–D – microprocessor controller, supporting 8 buses,
realizing protocol 1-Wire Bus on Dallas Semiconductor. It is connecting with
other modules by RS485, RS422 or RS232. The using on each of three
interfaces is depends of network topology;
¾ OKTOPPORT–А - microprocessor controller, supporting 8
analogue inputs, intended for servicing of thermometers, realized with thermo resistors or thermo - pair. It is connecting with other modules by RS485, RS422
or RS232. The using on each of three interfaces is depends of network topology;
¾ OKTOPPORT-Т - microprocessor controller intended for
measurement and management of thermo-objects and it has possibility for
settings monitoring and settings changing. It supports interface RS232 for
connecting with personal computer and one bus for 1-Wire Bus (Dallas
Semiconductor) realizing.
3. Technical characteristics
All of microprocessor modules (described in item 2) are using RISK
processor AVR90S8535 with 8MHz and 8K FLASH. Microprocessor efficiency
is 8 million instructions per seconds.
OKTOPORT-D
Each of modules includes programmer for processor memory programming
(onboard FLASH programmer), using LPT port on personal computer.
Each of modules local network communication uses one of three interfaces
(RS485, RS422 or RS232). The interface chooses is setting by switches.
Each of modules power supply is realized by two manners:
¾ from outside power 220V based on embedded block in the module;
¾ from interface cable (12 V and GND from personal computer).
The communication module (RS485/422) is used for connection between
operation station (personal computer) and OKTOPORT. The module transforms
RS232 signals in RS485 or RS422. The communication is one directional
(RS485) or two directional (RS422). The communication module can works as
“master” or as “slave”. It is powered by constantly power 12V from personal
computer and gives it (option) to the other devises from the network. The
modules (included in OKTOPORT) are designed for low consumption and can
work with power supplay 6V (6V power drop on power cable).
Communication module
The communication module is designed to support local network from type
OKTOPORT with 1000 m length and included modules from OKTOPORT-D
(A) type as follow:
¾ 31 modules in case of RS485 using;
¾ 16 modules in case of RS422 using.
All of the modules include termination resistors (permitted or forbidden by
micro switches) for long buses allowing.
OKTOPORT-D includes 8 1-wire buses and in each of them can be
connected to 16 devices (Dallas Semiconductor) from the type:
¾ DS1820 – electronic thermometer (from -55º to 125º C);
¾ DS2450 – 16 bits, two channels analogue (0-5V);
¾ DS2423 - 4 channel static electronic counter(to 4 MHz);
¾ DS2406 – two channel electronic switch (I/O);
¾ DS1990A - identification elements (Touch Memories).
Each of 1 wire buses maximal length is 75 m.
OKTOPORT-A supports 8 analogue inputs for thermo – resistors
servicing, realized by thermo – resistors or thermo pairs. It is servicing different
types of thermo – resistors or thermo pairs by embedded in the processor 4
channels 16 bits ADC. Each of the channels is galvanic isolated.
OKTOPORT-T is intended for thermo-object measurement and
management. It has possibility for setting monitoring and settings exchanging.
The module realizes thermo regulator, working autonomous or connected by
RS232 to the PC. The thermo regulation process is based on using of electronic
thermometers DS1829 (1 to 16) and power output (to 440W, ~220V), processed
by contactless relay sheme (synchronized by net frequency). The additional
option in the module is registering on power ~220V in the net.
OKTOPORT-T includes two digits display for temperature visualization
and 4 –buttons keyboard for work’s settings.
4. Information network architecture
Figure 1 shows block sheme on for instance system, based on
OKTOPOPT type modules.
RS 232
Communication
Module
Up to 16 m
RS485
RS422
T1
Up to 256 m
T16
TТ
C1
1
1
3
2
OKTOPOR -D
C16
4
5
ADC1
ADC16
SW1
SW16
6
7
Other
8
AIN1
2
OKTOPORT-A
AIN16
3
31
Other devises of OKTOPORT-A or
OKTPORT - D
type
Fug.1 Block schema on the system, based on OKTOPORT modules
(TТ, T1-T16-thermometers; С1-С16-counter inputs; ADC1-ADC16-ADC;
SW1-SW16-digital outputs; AIN1-AIN16-analogue inputs)
5. Special designed software
The OKTOPORT software is modular and includes two types of modules:
1. User’s software (realized in PC).
2. System’s software (resident in FLASH memory on the module).
The user software is based on high level program language Tcl/Tk and works
under Windows95/98/2000/NT/XP.
It includes the following modules:
¾ communication module – it realizes communication on the different
interfaces (RS232, RS485 и RS422);
¾ data base service (Mk4Tcl);
¾ graphic module – it realizes tables and graphics on video display;
¾ printing module – it is using for text and graphic documents printing;
¾ configuration module – it is using for working modes configuration;
¾ user’s module – it is allowing additional options and processes
(specific input information process, user’s menus, additional interfaces including
- TCP/IP, WAP, etc)
¾ information security tools.
The system software is resident on each of modules and includes
procedures for service of the specific periphery. It is developed on ANSI C and
Assembler for AVR90S8535.
There are the following classes of procedures:
¾ communication;
¾ information blocks coding and encoding;
¾ for working on 1-Wire Bus and realizing specific commands to the
periphery devices;
¾ basic result’s process (scaling, formatting, etc.)
¾ for modules and switched devices identification;
¾ testing procedures.
6. Applications
The system TERMOCONTROL 01 (fig.2) is developed based on
OKTOPORT. It is intended for monitoring and control of refrigerator
complexes.
Fig. 2.
TERMOCONTROL 01 includes:
¾ Computer configuration (PC, printer, UPS);
¾ communication module;
¾ Two modules of OKTOPORT-D;
¾ 16 thermometers DS1820;
¾ Communication bus RS422 with backup power supplay 12V.
¾ Software TERMOCONTROL 01.
The thermometers DS1820 measure temperatures from -55 to + 125 °С
and installed in the refrigerators with common 1 –Wire Bus up to 300m.
The length of the communication bus (from PC to the outermost module
OKTOPORT-D) can reach up to 1000 m.
The system is working continuously and in the power suplay breaking it is
possible to work 20 min.
The software TERMOCONTROL 01 includes:
- User’s software (realized in the PC);
- System software (resident in FLASH memory of the given module).
TERMOCONTROL 01 has following:
1. Creation of dynamic table for the current state (current temperature) in
each refrigerator in the system (fig. 3)
Fig. 3
2. Forming of two type of reports:
¾ twenty-four hour, with measured temperatures for 24 hours from
the last 24 hours and forms graphic and text document (fig.4);
Fig. 4 Graphic report for one refrigerator.
¾ weekly report with measured temperatures for each of last 7 days in
interval of 4 hours and forms graphic and text document (fig. 5).
Fig.5 Common graphic report
The system supports function for reports printing.
TERMOCONTROL01 supports data base for all measured temperatures.
Based on OKTOPORT can developing more applications connected with
process and control of:
• thermal objects;
• pulse inputs processing (with frequency up to 4 MHz);
• relay and analogue outputs;
• distributed systems for access control.
The further idea for system advance is the using of wireless communication
(DECT) and adding of new sensors.
Contact person: Dichko Bachvarov
Phone. (359 02) 72-13-61
E-mail: dichko@clmi.bas.bg