量度电压应该量度 R 和 G 两端。
红色(R)应该是24V 没错,但是其他三根线里面,G(GND)是common, 不是算control lines。
所有跟帖:
• G (绿色)线不是common,蓝色线是 -常谈- ♂ (31 bytes) () 09/12/2021 postreply 07:05:23
• you are right, C 才是 common. -原上草2017- ♂ (0 bytes) () 09/12/2021 postreply 08:21:40
• G (绿色)线不是common,蓝色线是 -常谈- ♂ (31 bytes) () 09/12/2021 postreply 07:05:23
• you are right, C 才是 common. -原上草2017- ♂ (0 bytes) () 09/12/2021 postreply 08:21:40
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