RS-485: Wiring and Connection/en: различия между версиями
(Новая страница: «{{warning|1= When connecting external devices to the Wiren Board via the RS-485 bus, it is necessary to connect not only the data lines A and B, but also the grou…») |
(Новая страница: «If your bus is longer than 100 meters, it is desirable to install a terminal resistor at its end (about 150 Ohms, see more in [https://ru.wikipedia.org/wiki/RS-48…») |
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The common wire terminal is designated, according to the equipment, as SC, SG, G, GND, ground or reference. On the Wiren Board controllers, this terminal is designated as GND. When connecting to an isolated port, you need to connect to the isolated ground of the port ("GND iso"terminals). | The common wire terminal is designated, according to the equipment, as SC, SG, G, GND, ground or reference. On the Wiren Board controllers, this terminal is designated as GND. When connecting to an isolated port, you need to connect to the isolated ground of the port ("GND iso"terminals). | ||
If your bus is longer than 100 meters, it is desirable to install a terminal resistor at its end (about 150 Ohms, see more in [https://ru.wikipedia.org/wiki/RS-485#.D0.A1.D0.BE.D0.B3.D0.BB.D0.B0.D1.81.D0.BE.D0.B2.D0.B0.D0.BD.D0.B8.D0.B5 Wikipedia]). For long lines, there are also recommendations to terminate unused cable conductors at both ends. | |||