In hardware programming, fromSerial is frequently used as a custom flag or function to manage data incoming from a physical serial connection (like USB or UART).

: Developers add fromSerial after concurrent combinators to manage how data streams are processed relative to one another. 2. Embedded Systems & Microcontrollers (Arduino/ESP32)

: Clinical studies may analyze "from serial diffusion MR images" to track the progression of conditions like glioblastoma over time. VPF Replay Module - Developer Forum | Roblox

: In projects using the Vrekrer SCPI parser , a boolean variable named fromSerial may be used to track whether a command originated from the serial port or a network connection like WiFi.