![]() Since the Raspbian operation system supports the most common USB-Serial converters like the U232-P9 that you find on eBay and computer shops, it is recommended to connect external RS232-devices via USB.īut sometimes you have breakout-modules with a serial interface that are directly connected to the GPIO header such as most GPS modules specially designed for the Raspberry Pi. You can distinguish between a hardware and a software handshake depending on whether the handshake uses specific handshake pathways or whether it occurs using special ASCII characters (XONXOFF) embedded in the data stream. In addition, both devices can agree on a handshake (flow control), with which they inform each other whether they are ready for the data transfer. However, it is necessary that both devices agree upon the same time duration of a single bit. In the idle state the sending and receiving devices are not synchronized with each other, i.e. In order to facilitate an error correction, a parity bit may be sent which indicates whether an odd or an even number of bits were set, but the parity bit may also be omitted. Then the data itself follows, including 5, 6, 7 or (usually) 8 bits. Modern computers no longer have serial ports, however this problem can be easily solved with low cost USB-to-serial adapters. Traditionally the serial interface is still used to connect measurement devices (voltmeters, oscilloscopes, etc.) and to communicate with roboters, modems and microprocessor systems (e.g. Lazarus Raspi Package Com Port Serial Interface Is In the Basic options dialog check the button Serial and select devttyS0 for the Raspberry Pi 3 or devttyAMA0 for older versions. Lazarus Raspi Package Com Port By graferencrum1976 Follow | Public ![]()
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