Newnes Interfacing Companion

2.6

Data communications

2.6.1 Communications

Once an analog signal has been digitised by the ADC, the digital information must then be passed to a port of a microcomputer for subsequent placement on the data bus. An inexpensive, readily available method is by serial communications using the serial port. Other common methods are to use an ADC interface card that interfaces directly to the computer bus system, and the GPIB parallel data bus.

Steps in serial transmission of a byte of digital data:

(a) byte is converted into sequential series of bits

(b) bit transmitted over signal wire

(c) bits reassembled into bytes

2.6.2 Byte to serial ...