Preliminaries on Latching Low Level Physical Signals from a parallel port of a PC

In this study, a practical approach is viewed to capture low level physical signals, which are in form of TTL (Transistor-Transistor-Logic) signals, from a standard parallel port of a personal computer, PC. Both hardware and software consideration is taken into account. An appropriate hardware design to latch TTL signal out of the PC, is proposed. High level programming language commands as well as operating system commands are mentioned in context with programming issues.

Keywords:

TTL, Low Level Signal, Parallel Transmission, Serial Transmission, RS232, TWI IO,

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1. Dülger, M. (2003). Developing a Software Package for Electronic Jacquard System of Classical Textile Machines. Ph.D. Thesis, University of Gaziantep. 2. RS232 protocol, http://www.camiresearch.com/Data_Com_Ba sics/RS232_standard.html 3. TWI protocol, http://www.plcturk.com/webserver/kumanda/ TWI.htm 4. SPI protocol, http://www.plcturk.com/webserver/kumanda/ Spi_01.htm 5. 74HC273, Octal D-Type Flip-Flop with Reset. 6. 74HC244, Octal Buffer Line Driver.