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M-Bus Mikro-Master

Mains-independant M-Bus master with USB-Interface for mobile installations and readout of small M-Bus systems with a Laptop.

M-Bus Mikro-Master | Relay Australia | M-Bus | Automation Industries
  • Max. 10 slaves

  • Baudrates: 300 to 9600 Baud

  • Bus cut-off at overload and short-circuit condition

  • USB-Interface

  • Power supply by Laptop 

  • USB cable (length = 1m)  in the delivery package

  • Laptop as mobile temporary master

  • Easy installation of M-Bus systems

  • Good for M-Bus demonstrations

  • Current USB driver from the chip manufacturer

A special version for PSION handheld computers is available on request.

The ServiceMaster

The M-Bus Mikro-Master is a complete M-Bus level converter, specially designed for mobile use. The device is supplied from the USB interface, which makes an external power supply unnecessary. This and its small housing recommend the Mikro-Master USB especially for service purposes such as meter parameterization, commissioning of installations or troubleshooting. For small networks of up to 10 meters, the MikroMaster USB is also suitable for permanent use in the installation. In combination with a laptop it is the ideal tool for every service technician and should not be missing in any toolbox.

M-Bus Mikro-Master Flow | Relay Australia | M-Bus | Automation Industries
M-Bus Mikro-Master Flow 2 | Relay Australia | M-Bus | Automation Industries

Technical Data

Operating Voltage

5VDC ±5%

Power Consumption

max. 1,5W

Power Input

Temperature Range

0 .. 55 °C

M-Bus Voltage (without load)

28V (Mark)
16V (Space)

M-Bus Idle Current

max. 15mA
(10 Unit Loads)

Max. M-Bus Quiescent Current

M-Bus Current (C20)

M-Bus Current (C3)

M-Bus Quiescent Current

Bus Impedance

M-Bus Standby Current

Overcurrent Threshold


Internal Bus Resistance

app. 100 Ω

Bus Extension

max. 500m (J-Y(St)-Y nx2x0,8)
(10 slaves at the end of the cable)

Transmission Speed

Transmission Speed Optical

Bit Recovery

M-Bus Baud Rate

300 .. 2400 Baud
with suppression of echo

Galvanic Isolation


Light-grey plastic bax
Protective class IP40
H x L x W: 30 x 54 x 110 mm


LED Status Indicators

Control Panel




Operating Controls


Screw Terminals



USB 2.0 Socket Typ B
M-Bus: 2-pin socket for pluggable screw terminal

Data Memory

Dimensions H x W x D





Firmware WebGUI Version 1 (Broadway)

Firmware WebGUI Version 2 (HTML5)

Order Information

Order Number



Micro-Master incl. adapter cable (NO LONGER AVAILABLE!)


Micro-Master USB incl. USB cable

Additional Accessories

Order Number



M-Bus readout software with automatic meter search and CSV export


M-Bus read out software, available in various license amounts

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