Schneider Electric iEM3100 User Manual

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DOCA0005EN-04

Communications via M-Bus

iEM3100 / iEM3200 / iEM3300 series user manual

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See the M-Bus organization website at www.m-bus.com for more information on the M-bus 
protocol.

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See “Communications setup” on page 84 for information on setting the baud rate using a 
telegram.

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:

— Single character
— Short frame
— Long frame

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Function codes (C-field bits 3-0):

— SND_NKE: Initiates of communications between the master and slave.
— SND_UD: The master sends user data to the slave.
— REQ_UD2: The master requests Class 2 user data from the slave.
— 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.

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See the M-Bus organization website at www.m-bus.com for more information on the M-Bus 
protocol, including secondary addressing procedures.

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See “Fixed data header” on page 77 for the meter-specific information required for secondary 
addressing (for example, identification number, manufacturer and medium).

The M-Bus tool provides a graphical user interface where you can view meter data and configure 
meter settings. To obtain the tool, go to www.schneider-electric.com and search for your meter model 
then select Downloads or contact your local Schneider Electric representative.

The communications LED indicates the status of the communications between the meter and the 
network as follows:

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See “M-Bus tool for data display and meter configuration” on page 85 for information on obtaining 
and using the M-Bus tool.

The LED is flashing

Communication with the meter has been established.
NOTE: The LED flashes even if there is a communications error.

The LED is off

There is no active communication.