relay key meaning in Chinese

继电器电键
继电器式电键

As to the software , we firstly scheduled all of the test signal path between the computer and the uut , the output control logic between the digital i / o card and programmable relay key matrix , and used all of this to be the base of software design , then we introduce the block flow of software
在软件设计部分首先规划了所有测试信号在计算机主机与被测件之间的连接和传输路径、数字i / o卡对可编程继电器开关矩阵的输出控制逻辑，作为软件设计依据，随后介绍了软件的模块化设计思想。