Mux 4 : Multiplexeur pour instruments

Multiplexers for measuring instruments

E-Mux 4 and E-Mux 8

A Multiplexer 4 or 8 inputs


The multiplexer MUX enables the communication of 1 to 8 measuring instruments (caliper, digital indicator, micrometer, weight scale, torque wrench...) from any brand to a PC or similar equipment equipped with a USB port or a RS 232 interface.

Furthermore, these devices can be plugged to each other, in the same way as the M-Bus. They can also be installed on a standard DIN rail.

One module has 4 or 8 Inputs, and there can be up to 99 Inputs on the Bus in total



Connection possible with the following instruments (but not limited to):

- Digimatic : Mitutoyo, Mahr

- Opto RS232 : Sylvac, Tesa, Bowers, Käfer etc...

- RS232

- Analog ouput, single or bipolar, in current or in voltage...


Instrument recognition is automatic.


Metro is able to manufacture special cables to connect your instrument to the Mux. For quotation please contact us or your local dealer.



Main characteristics :


  • 1 USB port for a connection to a PC and power supply
  • 1 RS232 port (MUX4 RS232 only) for connection to a PC
  • 4 or 8 inputs for measuring instruments with 1 LED by channel
  • 1 input for external command (footswitch)
  • 1 Reset button
  • Storage temperature -40 °C to +70 °C.
  • Operating temperature : +5°C to +40°C.
  • Power supply 235 V Consumption : 2 VA
Mux 4 : Multiplexeur pour instruments




  • Mitutoyo and Mahr instruments are connected to the E-MUX4 through their original cable.(Digimatic)
  • Opto RS232 duplex instruments (Ex: Sylvac, Tesa, Käfer...) are connected through a cable ref 18010
  • Instruments having a RS232 output are connected with cables ref 18100. This cable can be delivered ready to use or easily configured by the user in order to fulfill each particular need thanks to the MuxConfig software.
  • Instruments equipped with an analogue output in voltage or current are connected with the cable ref 189xx : ±5V, ±10V, 0-5V, 0-10V, 4-20mA, ±20mA, 0-20mA.





There are 3 ways to read your measuring instrument :

  • By a software request received on the communication port (RS 232 or USB depending on the model).
  • By a footswitch connected to the E-MUX4
  • By using the tranfer button of the instrument

This configuration enables the PC to get the measurements taken from different instruments.
It is possible to get the measurement one after each other, or several instruments together (multi-gauging)

The free Winmux software allows to bring directly the data into a spreadsheet software (Excel, Open office...).


Item references


Item Reference
E Mux4 EM-4D
E Mux8 EM-8D
Cable between E-Mux and PC (lenght 2m) 81210-2
USB-A / USB-B cable between E-Mux and PCCBL-USB-003
Wall transformerACS-ALI-0001



Footswitch : (ref 18020 )


This footswitch is used to send a measurements to the USB or RS232 port



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