M-TEC Energy Butler

Installation

1. 1Connect the ModbusCloud gateway to the M-TEC Energy Butler's Multi-Funktion Port connector using the appropriate cabling.
2. 2Configure the Modbus communication settings on the gateway: 9600 baud, 1 stop bit, no parity, and auto timing.
3. 3Verify the Modbus TCP connection by reading a known register such as the state of charge (SOC) value.
4. 4Import the M-TEC Energy Butler template in the ModbusCloud platform and assign it to the connected gateway.
5. 5If using a Gen2 device, replace the register addresses in the template with the corresponding start registers from chapter 4 of the M-TEC documentation.
6. 6Confirm that all readings, including battery metrics, power values, and fault flags, appear correctly on the ModbusCloud dashboard.

Things to watch for

01

How do I know if my M-TEC Energy Butler is Gen2 or Gen3?

Refer to chapter 2 of the M-TEC Modbus documentation, which explains how to identify the hardware generation. The register addresses differ between Gen2 and Gen3 devices.

02

Why are some register values showing as zero or incorrect?

Some registers use int32 or uint32 data types that span two consecutive Modbus addresses. Verify that your register mapping accounts for both addresses and uses the correct byte order.

03

What baud rate and parity settings does the M-TEC Energy Butler require?

Set the baud rate to 9600, stop bits to 1, parity to none, and timing to auto. Incorrect settings will prevent communication.

04

Can I use this template for a Gen2 Energy Butler without modifications?

No. The template is designed for Gen3 devices. For Gen2, you must replace the register addresses with the corresponding start registers listed in chapter 4 of the M-TEC documentation.

Registers (15)

15 read / 0 write

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