Advantech RS-485 Instrukcja Użytkownika Pobierz pdf (Strona 337)

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ADAM-5000 F-5

Appendix F

1.3 Normal Mode and Common Mode

Figure F-3: Normal mode and Common mode.

Have you ever tried to measure the voltage between ‘Hot’ and

concrete floor, or measure the voltage between ‘Neutral’ and concrete

floor? You will get nonsense value with above testinF. ‘Hot’ and

‘Neutral’ were just a relational signal, so you will get the AC110V or

AC220V by measure those two signal. Normal mode and common

mode just show you that the ‘frame ground’ is the most important

reference signal for all the systems and equipments.

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