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5 Human-readable commands are transmitted between the devices, and data is trans-
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If an application does not t all these criteria, then you probably should be looking for another method of communicating between the PC and the PIC microcontroller.
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Depending on when you bought your PC and the operation system that is running on it, you may or may not have Higraeve s HyperTerminal ASCII terminal emulator loaded on to your PC under the Communications pull-down. In this section I want to introduce you to the application and show you its different features as an example of what you should be looking for in a terminal emulator to which you will interface a PIC microcontroller. As I said in the preceding section, I feel that the serial port is the best way to interface to a PIC microcontroller. As part of the interface, I recommend that the communications are to be as human readable as possible. This allows the PIC microcontroller application to be tested and debugged separate from the PC application to eliminate as many variables as possible. In demonstrating PC terminal emulators, I am going to focus on Hilgraeve s HyperTerminal. If you do not have a copy of HyperTerminal or want to upgrade to the latest level, you can download and install HyperTerminal for free for personal use from the Hilgraeve web site: www.hilgraeve.com/. To con gure the terminal emulator, rst disconnect it (the program connects itself automatically) by clicking on the telephone with the receiver off, or click on Call and select Disconnect. Now select File and then Properties to display the Properties dialog box. This dialog box speci es how you would like HyperTerminal to work for you. Click on the Settings tab, and make sure that Terminal Keys, ANSI, Emulator, and 500 (line) backspace buffer are selected. The Terminal Setup menu will allow you to de ne the cursor settings used in the HyperTerminal dialog box. ASCII setup will allow you to tailor the data to the application. These parameters are really user- and application-speci c. For the most part, I leave these at the default values. Finally, make sure that you have a direct connection and that the program does not attempt to access the system through a modem. Next, click on Con gure, and look at the parameters to set up. For PIC microcontroller applications that connect serially in this book, select Eight bits, None for parity, 1 stop bit, and None for ow control. The data rate ( bits per second ) is the value you want to use (usually 1200 bps for the projects presented in this book). Selecting None for ow control means that a three-wire RS-232 can be used. Don t worry about advanced ; it is normally used for specifying the serial port s rst in/ rst out data buffers (FIFOs). To be on the safe side, select No FIFO operation. Finally, click on View, and select Font ; select a Monospace font such as Courier New, which is easier to follow than a proportional spaced font when you are sending formatted data between the PC and an external device. With your setup nished, click on File and then Save As so that you can save these parameters. The default directory should be desktop. For the le name, enter something descriptive such as
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and click on SAVE. If you minimize all the active windows now, you ll see that a new tab is on your desktop that will bring up the HyperTerminal with the parameters that you just entered. When HyperTerminal has the desktop s Focus and is Connected, when you press a key, the ASCII code for it will be transmitted out of the PC s serial port. Data coming in on the serial port will be directed to HyperTerminal s display window. Files also can be transferred; this is an excellent way to create test cases instead of repeatedly typing them in manually. Doing a Send File will send the le exactly as it is saved on disk. Send Text File is preferable because it transfers the le s ASCII data in the same format as if it were typed in, including the Carriage Return / Line Feed line-end delimiter. You can use other terminal emulators instead of HyperTerminal, but if you do, you should be selecting an application that has the following capabilities:
1 2 3 4 5 6 7 8
TTY and ANSI terminal emulation Varying data rates 8 N 1 data format Monospace fonts User-selectable com port access User-selectable handshaking Con guration save Text le transfer
This is a pretty basic list of features, but if your terminal emulator provides these capabilities, you will be able to use it to interface to the PIC microcontroller applications presented here, as well as to any that you create on your own.
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