M-Bus protocol support
The meter supports the M-Bus protocol as follows:
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Mode 1 communications (least significant bit first).
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Telegram formats:
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Single character
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Short frame
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Long frame
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Function codes (C-field bits 3-0):
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SND_NKE: Initiates of communications between the master and slave.
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SND_UD: The master sends user data to the slave.
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REQ_UD2: The master requests Class 2 user data from the slave.
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RSP_UD: The slave sends requested data to the master.
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Secondary addressing in accordance with the M-Bus standard.
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Broadcast telegrams.