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75176 Data Enable ( DE ) Control from PIC16F877
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Figure 21.36 The PC ISA adapter card contains the PIC microcontroller with the parallel slave port (PSP) and RS-485 interface.
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Figure 21.37 The external sensor is a simple circuit powered by 12 V coming from the RS-485 connection with the DS1820 temperature sensor on the far left.
PROJECTS
slave port (PSP) enabled. This PIC16F877 uses its USART to communicate to a remote PIC16HV540 that interfaces with a Dallas Semiconductor DS1820 temperature sensor via RS-485. This entire application uses less than 620 lines of code (including comments). The application works very well and could be used as the basis of a home temperature-sensing system. The rst card that I created was the ISA card that the PIC16F877 resided on. In Fig. 21.38 you can see that the circuit is quite simple to implement with only ve chips. The circuit itself uses two 74LS85 value comparators and a 74LS138 for address selection. The RS-485 interface is implemented with a 75176, and the PC s 12-V power supply is passed to the remote sensor for its power. In the gure you can see that there are other (unpopulated) sockets on the board; this ISA prototype board was taken from previous projects simply because it is quite expensive, and I wanted to reuse it rather than spend $100 on a new one. The bill of materials for this circuit is listed in Table 21.16. There are a number of aspects of this circuit that will seem unusual. I use the PIC microcontroller itself for driving the address that is compared to when writes to the PSP port take place. The circuit was originally an ISA prototype card that I had lying around from previous projects, and rather than rewire the circuit, I used the circuit already on the prototype card. This circuit uses the PIC microcontroller to output the most significant 7 bits of the PC s I/O port address. The lower 3 bits are decoded and selected by the 74LS138. This method of decoding the PC s I/O port addresses allows me to select different addresses according to my own requirements. For this application, the ISA card presented here was the only optional card, so I used address 0x0300 (the rst prototype adapter block) for this application. Note that in this circuit the received data driver control (_RE) of the 75176 is always pulled low so that the driver is active. I did this so that the PIC microcontroller s RX pin (RC7) is always being driven. The LED was added to provide a visual indicator of when the ISA card received valid data. When I originally built this card, I used an old 80386 processored PC that I had bought for $30. This PC had I/O slots that were a standard three-quarters of an inch apart. For this project, I used a different PC that only had half an inch between slots. This meant that I had to reposition some cards in the system as well as cut down the ends of the wire-wrap pins. If you have to do this, please be careful and keep track of all the cut pins and clean them off the board you do not want any of them falling into the PC and shorting out anything on the PC s motherboard. The ISA card s PIC16F877 source code is PCTherm2.asm and can be found in the code\pctherm folder. This project does not have to use the PIC16F877; any 40-pin mid-range PIC microcontroller will work (because they all have built-in USARTs and PSPs). To communicate with this card, I wanted to use a PIC16HV540 ( high voltage ) PIC microcontroller to take the 12-V power from the PC and convert it to 5 V for the remote application. In doing this, I wanted the PIC16HV540 to power the 75176/RS-485 interface and the DS1820 digital thermometer. When I started working with this circuit, I discovered that the PIC16HV540 did not have the current drive capabilities required
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