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is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus. Traditionally "serial" relates to a three (or more with hardware handshaking) wire system (TIA-232-F), now using ∓25V Voltages. Technically speaking the specialized SPI (Serial Peripheral Interface) and I2C (Inter-Integrated Circuit) buses are serial communication systems as well - use one of those tags if they would be more appropriate!

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I have read quite a lot of tutorials and tips about the issue, but serial port just doesn't work. There has to be some configuration that I have missed. The setup Raspberry Pi 1 Model B (oldest … random data to serial port while scoping TX pin with my oscilloscope. TX pin was always high. Python snippet: import serial port = serial.Serial("/dev/ttyAMA0", baudrate=9600, timeout=3.0 …
asked Apr 30 '18 by Petri Mantere