MTM-EtherStem: Ethernet Microcontroller Module

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MTM EtherStem  Module
  • $129.00 (USD)
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  • The MTM-EtherStem link module is part of Acroname's MTM series.  The TCP/IP Ethernet link allows communication between a host based application and any module on the BrainStem bus. It features a wide range of IO, making it ideal for interfacing with various hardware in a test environment.

  • Manufactured By - Acroname Inc.



The MTM-EtherStem is a BrainStem link module and part of Acroname's Manufacturing Test Module (MTM) system. It allows a TCP/IP based Ethernet connection to a host PC which may be used for test direction, control and data collection. It may also be used to load reflex programs to MTM or BrainStem modules for PC-free operation.

This module provides a TCP/IP Ethernet link to a host PC or network for test automation control and data collection. Using this link and the BrainStem API, any host based application can interact with a device under test, other MTM module(s), test station hardware and custom peripherals, as well as log and store data from a test. The MTM-EtherStem features general purpose digital inputs and outputs, 12-bit analog inputs (A2D/ADC), a 10-bit digital to analog converter (DAC), serial UART ports, a BrainStem I2C FM+ (1 Mbit/s) bus and a peripheral I2C FM (400 kbit/s) bus.


  • Cross-platform driver support (Mac OS X, Linux and Windows)
  • 3 analog to digital input at 12-bit resolution
  • 1 digital to analog output at 12-bit resolution
  • 15 general purpose digital inputs/outputs
  • 1 I2C FM+ (1 Mbit/s) (used as the BrainStem bus)
  • 1 I2C FM (400 kbit/s)
  • User, link, power and heartbeat LEDs
  • 2 UART serial ports
  • 1 TCP/IP Ethernet port (100 Mbit/s)
  • uSD slot for additional storage
  • Bridge from Ethernet to I2C bus transactions
  • Realtime clock
  • Bulk capture mode for analog inputs
  • 6V to 12V DC input power
  • 3.3V input/output voltage
  • All input/outputs protected upto 12V input
  • 0 to 70˚C ambient operating temperature

Manufacturing Test Module System (MTM)

The MTM-EtherStem module is part of Acroname's Manufacturing Test Module (MTM) system. Each module in the MTM series is ruggedized and designed to survive the rigors of CM or OEM manufacturing environments around the world. Pin interfaces are protected against reverse polarity and over voltage connections are designed to operate from 0˚C to 70˚C ambient, with no external cooling or fans. As a BrainStem Spindle, the MTM-EtherStem module provides a BrainStem link to connect to a host PC or network. It can also operate independently by running embedded, user-defined programs based on the BrainStem reflex language.

Every MTM module utilizes the BrainStem API for C++ host-based applications and the BrainStem reflex API which closely emulates the C++ API. Each module also features a self-discovery and notification system, allowing embedded and host based applications to determine the module's capabilities and programmatically control and direct communication between modules on the BrainStem network.

Product Assets

Name Notes File
S67-MTM-ETHERSTEM_datasheet.pdf Datasheet Download