The PSD302 is constructed by Maple software running in the DOS environment. The specific structure is: multiplexed address data mode, 16-bit data bus, reset low effective, select RD and WR; the PA port in the system uses 8-way digital input The PB port is used for 8-channel switch output, and the PC port is defined as chip selection. The address is decoded by the chip selection equation to provide chip select output signals for other chips in the system. The 64K large-capacity EPROM in PSD302 enables the program to use both the PID control algorithm and the fuzzy control algorithm for segmentation control to improve the control quality. The A/D sampling PTS mode 80C196KC provides the peripheral transaction server PTS function, PTS and normal interrupt. The difference is that the normal interrupt program should protect the program pointer and the work field register when entering the interrupt entry, and the scene must be restored when exiting, but the PTS does not need to.
This paper briefly introduces the software and hardware design method of the new fan controller. It is not difficult to see that due to the adoption of some software and hardware optimization measures, the software and hardware design of the system is simplified, and the program operation efficiency is improved. By adopting the CAN bus technology, The communication inside the building automation system is reliable and fast, and achieves good energy saving effect. The practical application proves that the device has good control effect and high reliability. The temperature control accuracy reaches 0.5bC and the humidity control accuracy reaches 2% RH during automatic operation. The system has good expandability and can be extended to other than intelligent buildings with minor modifications. Use in a wider range of fields.
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