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Unformatted text preview: Laboratory assignment three Error detection in digital communication lines EECS 203 Lab report due during your lab check slot on April 29 Please keep track of how long you spend doing this laboratory assignment. Specifically, how much time is needed to do the problems after studying enough to understand the concepts? Please carefully review lecture four before starting this assignment. If you make catastrophic wiring mis- takes, this could result in be exploding integrated circuits sending chunks of plastic into your forehead. In this laboratory assignment, you will be modifying a circuit so that it will tolerate errors on (encoded signal) communication wires between a control panel and remote outputs. Although this lab assignment isnt more difficult than lab two, it does require more independent thinking. Ill try to guide you through the necessary steps in the Theory section of this handout. Please show your work in your lab report. 1 Original design You have been hired by a space flight company to improve their rocket design. An actuator is a device that performs a mechanical action in response to an input signal. In the original design, most actuator signals were generated by error- tolerant primary control computers located very near the actuators. However, a few signals came from the pilot control panel. In the original design, the pilot could push buttons to generate any of the signals indicated in the following table. 1. no action 2. open hatch ( H ) 3. decompress cabin ( C ) 4. eject pilot ( P ) 5. release safety harness ( S ) 6. self-destruct ( D ) The actuators and control panel are both highly reliable. They were connected by a shielded cable containing four wires, one of which is presently unused. The original design called for the transmission of four unencoded signals. The projects prior engineer decided to add a signal, and made due with the same cable by encoding and decoding the signal. You were able to learn this information by reading the excellent technical reports produced by the engineer who formerly held your position....
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- Winter '08