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ISO transport service network in the form described in the figures Retri

Also described readable and easy to understand. Described further show that can hold it can track the signal flow, helps to identify Ts incorrect operation towel, make sure to invite class error Buzhi Yu occurred. Nan this, NPN is a very useful tool in the form of description. ,[link widoczny dla zalogowanych], C continued on page 35) 21 sequences, the core state DOS should first check mark, when the non-0 to the process of switching. Of course, the line will be put into the process of making the system function can be called; when the core state is 0, should immediately withdraw from INT1CH, again after waiting 55ms into XINTICH, re-examine this flag to carry out such treatment. In some specific applications, if the level of priority of the process is relatively simple (for instance, only two, you can use a simplified method. Can be completed in the usual procedure lowest priority process, completed in INT1CH high priority interrupt stage process. This is the process of switching is interrupted with the entry and exit automatically. However, in the INTICH implementation process will involve INT1CH reentrant,[link widoczny dla zalogowanych], EOI interrupt the end of the command sent in advance, and low-priority process activation may be a special issue 3 features distributed network design example of the local station discussed the use of m on the base TMS - DOS real-time system design approach, the authors completed a detailed,[link widoczny dla zalogowanych], real-time system for distributed network working one by one Local features intermediate station service system. The system uses IBM-Pc/AT computer, system software and assembly language mixed with the preparation of TurboC. Its functions are: to receive lower computer data and sent forward by the next crew to the host computer l command (in this, the PC is a distributed network control center} dry degree and the next crew for the set A point in a working data acquisition and control devices) the implementation of PC orders; Allium based on real-time data show that the accused forced the state from the object; such as power system wiring diagrams, voltage and current values, active and reactive power, etc.} while also receiving the keyboard command to complete the picture mobile, data Save and print functions. The system was developed using assembly language interrupt driven serial hope line port communication device drivers. to break a way through RS 232 serial port to receive data from the lower machine. As a result interrupt, thus ensuring real-time data reception. no matter which system is currently running a feature, can enter at any time data receiving state, leek save data in the buffer, waiting for the screen display and other functions to read data. This system is another important feature of ten t printing functions can be made with the implementation of other functions set maker. The realization principle is to show screen screen mobile, data archiving and printing functions into two levels, the first three to a level of printing capabilities to another level. As a long time to print the work, and generally not very tight, so set its priority to the lowest place In the usual process of implementation,[link widoczny dla zalogowanych], and other functions on INT1CH interrupts to complete. When the system is printing, INT1CH every 55ms access time,[link widoczny dla zalogowanych], if not at the TDOS kernel mode at this time, you can perform other functions. 55ms quiet time, to the observation of who is very short, from a visual point of view all the features have been implemented, and the print job never seems to stop over Ding. 4 Conclusion The successful implementation of this distributed system port on the table: Based on MS - DOS real-time systems The design is entirely feasible. and because rich PC, software support, its performance is very good, display, print and operations have achieved the finished, the user is very convenient. Because it is used in ordinary Pc, / AT machine, it runs Maintenance is also more convenient. This system has been used in a mining area power supply automation network.
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