2025-03-06 20:09:23R. Bishop:
Added section on duplexing
communications/serial.md ..
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## Full or Half duplex?
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**What do we mean by duplex?**
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A duplex communication system refers to any point-to-point (PTP) system composed of two or more connected devices which can communicate with each other in both directions. There are two common duplex communication systems: Full-Duplex (FDX) and Half-Duplex (HDX).
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**What's the differences?**
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In a **Full-Duplex** system, communication can occur in both directions simultaneously. Old-style telephone service lines are a prime example of an FDX communication system; both parties are able to speak and be heard by the other party simultaneously, there is a constant channel each way between them.
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In a **Half-Duplex** (also known as a **semiduplex**) communication can only occur one way at a time. If device A would like to send data to device B, but device B is already sending data to device A, then device A will have to wait until device B has stopped transmitting to send data.
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## Most common Serial Architectures
The most common Serial Architectures are listed below: