The use of digital input and output is to provide information processing systems such as computers with the data they need to work on. These devices allow the processors to process logic states which can be true or false for a given instance. It is also possible go use digital input to indicate whether voltage in a device or circuit is low or high based on a given value for reference. One know that the voltage is higher than the limit by observing the turning on of light emitting diodes on the device and switching off for low values.
The information processing systems like computers veil results to users using the digital output devices. Since they are digital, logic data is used to give feedback meaning it gives a possible value of either true or false. The digital output devices give users the ability to command the systems on whether to use low or high voltage values. A voltage is produced when a user sets the value as high using the digital output devices and no voltage produced for low voltages.
Data acquisition involves taking samples of physical processes in the real world and doing measurements on them to produce digital data. Conclusions from these tests are reached after the data is converted to a form used by computers and processing the data yo give out information on the tests.
Sensors are used to collect or measure these conditions then the data are taken to circuits which convert the signals into data then the data is processed by devices that convert it to computer acceptable input. The data acquisition process is also enhanced by deploying the use of computer programs to process all this data and make meaning from it. This is because the systems are used for complex conditions which require fast processing and therefore the need for advanced programs to aid in the process. Natural conditions that can be measured using such systems include force, light intensity, the hotness or coldness of a place or fluid flow.
Analog input and output devices are those that can read and give data relating to a continuous state meaning not necessarily two values. Digital input and output only reads two possible values either true or false or on and off for a given condition. It is possible to read digital inputs and outputs using analog tools and also digital tools but not possible for the case of analog signals and data. Application for digital data is in only cases which require determining the truth or presence of a condition while analog goes on to give exact details about the condition in question.