Remote ADC with RS232 Output

The circuit converts an analogue voltage to its digital equivalent which is transmitted to a PC via an RS232 link.This type of circuit is useful for controlling remote equipments using only one PC. For example, you can monitor several furnaces by sending their individual temperatures to a central PC. In combination with a simple program the ADC lets you decide which action must be taken when certain temperatures are measured.This circuit is composed of three building blocks. The first one handles the conversion of analogue signals to digital data. The second block accepts the digital data and puts it in the standard RS232 data frame before converting it to a bit stream. The last function is the RS232 line driver.