MM20-USB opsecena 1


  • Transparent conversion of M-Bus interface to USB interface
  • Reading of up to 20 M-Bus slave devices
  • Short circuit protection of M-Bus line
  • LED indications On, Rx, Tx
  • Galvanic isolation up to 1kV DC
  • Automatic set of data rate and format
  • Plug & Play installation
  • Power supplied from USB port
  • Compatible with Windows 98/ME/2000/XP and Linux operating systems
  • Driver for virtual serial port


MM20-USB is interface converter intended for transparent readout and power supply of M-Bus slave devices. Converter is powered from USB port and galvanically isolated from the M-Bus line. LED indications show power supply presence, data transmit and receive. Data rate and format adjustment is performed according to M-Bus slave device. Converter is designed to withstand short circuit on M-Bus line.


MM20-USB is suitable for installation and service of M-Bus slave devices. In combination with a laptop, it is suitable for the local setting and reading of heat, water and electricity meters, and other devices that communicate according to M-Bus protocol. Converter acts on M-bus line as standard M-Bus master device which can sustain up to 20 M-Bus slave devices.

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Technical specification
M-Bus interface M-Bus master, up to 20 M-Bus slave devices, transparent protocol, speed 300-9600Baud; Connection: Pluggable screw clamp, RM 5mm, 2.5mm2
M-Bus port quiescent current: 0-30mA, short circuit: 50-70mA with restart function, line voltage: 30.5V +- 5%, internal resistance
M-Bus line length max 12km@300Baud, min 1km@9600Baud, cable JYSTYnx2x0.8
LED indicators ON, Rx, Tx
Overvoltage protection tranzorb on M-Bus line
M-Bus port quiescent current: 0-30mA, overcurrent: 50-70mA with restart, line voltage: 30.5V +- 5%, internal resistance <100Ohm
USB interface USB 1.1 and USB 2.0 standard
Connection: USB (type B)
Data rate and format Automatic, according to M-Bus slave device
Galvanic isolation 1kV DC
Power supply From USB port - no additional mains adapter is required
Operating temperature -20 do 75C
Dimensions 90 x 43 x 20 mm