將單一位元組寫入 |tty|，以啟用外部轉發狀態。
usage: fx set-relay [--off|--on] /dev/ttyUSB0
Turn on or off a USB-connected relay on the specified device.
fx 設定接力
除非另有註明，否則本頁面中的內容是採用創用 CC 姓名標示 4.0 授權，程式碼範例則為阿帕契 2.0 授權。詳情請參閱《Google Developers 網站政策》。Java 是 Oracle 和/或其關聯企業的註冊商標。
上次更新時間：2025-07-25 (世界標準時間)。
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