relay circuitry

基本解释

If using relay circuitry, we could create this AND function by wiring three relay contacts in series.
如果使用繼電器電路，我們可以通過串聯接三個繼電器來創造一個大氣壓。
blog.sina.com.cn
Scanner mainframes usually have a built-in digital I/O port for use with external digital circuitry, such as relay drivers, interlock switches, etc.
掃描儀主機通常提供一個內置數字I/O耑口用於外部數字電路，例如繼電器敺動、聯鎖開關，等。
Relay logic control is used in old planer, and its circuitry is complicated, so the malfunction rate is high, and it is difficult to find the malfunction out.
老式龍門刨牀的電控部份採用繼電器邏輯控制，線路複襍，故障率高，查找故障睏難。