信号切换是两路或两路以上信号输入，根据用户要求，进行自动切换。主要有485信号切换器，422切换器，232切换器，TTL切换器。
笔记本电脑信号切换 Fn LCD
翻译公司信号切换 vedio signal switch
切换信号 switching signal ; Motor cue
信号和轨道切换修理工 Signal and Track Switch Repairers
信号切换和变换板由JZX - 18f继电器和WB系列电量传感器组成。
Signal switch circuit board is composed of JZX-18F relay and WB series sensors.
在电流切换应用中，可能需要将多个电流信号切换至单台仪表，或者可能需要将一个信号源连接到多个负载。
Current switching applications may require connecting multiple current signals to a single meter, or may require connecting a single source to multiple loads.
基于PIN二极管开关电路在射频信号切换方面的特性，设计了一种应用于滤波器切换的PIN电子开关电路。
Based on characteristics of PIN diode switch circuit in rf signal switching, a PIN electronic switch circuit is designed to perform filter switching.
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