DM900 is applied to the explosion-proof high-voltage and low-voltage switches in the mines of a large state-owned coal mine group. By installing a DM900 at each end of the explosion-proof high-voltage and low-voltage switches, the RS485 monitoring parameters of the explosion-proof low-voltage switches can be sent to the high-voltage switch end, and then uniformly reported to the monitoring room on the shaft through the interface of the high-voltage end.

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