Make communication between industrial machines easier to update and iterate.

[peers8862]

Via software, hardware and standards.

[peers8862]

CNC machines are typically updated or reprogrammed via UART (Universal Asynchronous Receiver/Transmitter) by following this general process:

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1. Connect to the CNC Controller via UART

• Physical Connection: Use a serial cable (RS-232, TTL, or USB-to-UART adapter) to link the CNC machine’s controller to a PC, microcontroller, or programming device.
• Port Settings: Configure baud rate, parity, stop bits, and flow control to match the CNC’s requirements.

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2. Enter Programming or Update Mode

• Manual Trigger: Some CNC controllers require a specific command, button press, or jumper setting to enter update mode.
• Command Sequence: Send a special sequence or protocol command to instruct the CNC controller it’s about to receive new instructions or firmware.

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3. Upload New Program or Firmware

• G-code Transfer: For machining instructions, send G-code files over the UART link. The controller parses the commands in real time or stores the file for later execution.
• Firmware Update: For controller firmware, send the binary or hex file using a protocol like XMODEM, YMODEM, or a proprietary updater tool.

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4. Verification

• Checksum/Echo: The CNC controller may request checksum verification, echo received data, or run a simulated parse to confirm integrity.
• Status Response: Controller sends a message (e.g., “OK”, “ERROR”, or “UPDATE SUCCESS”) to indicate the result.

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5. Restart or Resume Operation

• Automatic Reboot: After successful upload, the controller often automatically resets or enters standard operation mode.
• Manual Reboot: Some machines may require a power cycle or manual reset.

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Notes:

• Security: Some modern CNCs use digital signatures or encrypted firmware/files to ensure authenticity.
• Backup: Always backup original firmware and configuration before updating.
• Protocol Differences: Steps may vary based on CNC manufacturer, controller logic, and software protocols.

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If you need specifics for a particular CNC controller model or brand, let me know!

[peers8862]

Absolutely! Let’s build on the CNC update/reprogramming process via UART with more specifics, practical steps, and how microcontrollers or your proposed device could be involved.

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Detailed Process: CNC Machine Update/Reprogramming via UART

1. Establishing UART Communication

• Physical Interface:
  CNC controllers typically expose a UART port (sometimes RS-232, sometimes TTL).

  • Connect via serial cable, with proper pinout (TX/RX/GND, possibly CTS/RTS for hardware flow).
  • If your programming device uses USB, you’ll need a USB-to-UART converter.

• Configuration:
  Set the serial communication parameters:

  • Baud rate (commonly 9600, 115200, or device-specific)
  • Data bits, stop bits, parity
  • Flow control (none, hardware, software)

• Terminal/Software:
  Use terminal emulators (PuTTY, minicom, Tera Term) or custom scripts to interact with the CNC serial console.

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2. Entering Programming/Update Mode

• Manual Entry:
  Some CNCs require pressing physical buttons, holding a reset, or setting DIP switches/jumpers.

• Serial Commands:
  Others can be triggered via special serial commands (e.g., sending “BOOT” or “UPDATE”) or proprietary handshakes.

• Microcontroller Role:
  Your device (with RP2040/ESP32) could automate this by sending the necessary sequence, monitoring the CNC’s responses, and ensuring safe entry to update mode.

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3. Uploading the Program/Firmware

• Program (G-Code):
  For normal operation, G-code files dictate tool movement.

  • Files are transferred as plain text via UART, parsed line by line.
  • Some CNCs allow batch upload, others require interactive line-by-line communication.

• Firmware:
  To update controller firmware:

  • The firmware file (binary or Intel Hex format) is uploaded using a protocol (e.g., XMODEM, YMODEM, or custom).
  • Your device can act as a host, providing file integrity checks, retries, and even chunked transmission.

• Automated Workflow:
  A microcontroller-based device could:

  • Scan files with RP2040 for security, tag them, then “pipe” to CNC.
  • Use ESP32 to broker access, especially for remote transfers or credentialed updates.
  • Provide command logging and error catching.

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4. Verification & Validation

• Echo and Checksum:
  During transfer, CNC controller may echo received lines or request/verify checksums.

• Status Reports:
  Controller sends status messages after each step (“OK”, “Checksum mismatch”, etc.).

• Safe Handling:
  The device can log these responses, halt transfer upon errors, or alert users for intervention.

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5. Restart/Reboot

• Automatic Reset:
  After successful update, controller may auto-reboot and load new program/firmware.

• Manual Reset:
  Sometimes manual power cycle is needed.

• Device Role:
  Your device could issue reset commands or even control the power line to ensure proper restart.

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How Your Proposed Device Could Improve This Process

• Security:
  All files pass through RP2040 for scanning/tagging, blocking malicious payloads before reaching CNC.
• Credential Management:
  ESP32 stores update credentials/API keys securely, granting access only when proper requests are brokered via terminal.
• Terminal Control:
  Allows programming, automation, and monitoring from a command-line interface; can script the whole update process.
• Automation:
  Reduce manual steps, handle batch updates, verify transfers, and generate logs for traceability.
• Remote Workflow:
  With ESP32 Wi-Fi/Bluetooth, updates can be delivered or triggered remotely under secure protocols.

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Example Scenario

Imagine you’re updating multiple CNC machines:

• You connect the device (Tpico C3) between the PC and CNC.
• You launch a terminal interface, send update commands.
• The device scans files, tags and authenticates them, then sends to CNC via UART.
• It logs transfer progress, verifies integrity, and manages credential access for firmware authentication.
• On completion, it triggers a safe reboot.

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[peers8862]

Your USB dongle, based on the Tpico C3 (RP2040 + ESP32), can receive a variety of data from a CNC machine during operation. Here’s a detailed look:

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Types of Data the Dongle Can Receive from CNC Machines

1. Machine Status and Health

• Current state (idle, running, paused, alarm)
• Error logs and alarms
• Spindle speed, tool position (coordinates), axis movement
• Temperature or vibration data (from sensors, if available)
• Power consumption

2. Live Process Data

• Real-time feed of G-code execution (currently processed command)
• Toolpath information
• Current job progress (percentage, time remaining)
• Material usage stats (if monitored)

3. Operational Feedback

• Confirmation of command execution (echoed G-code lines, “OK”, or error)
• Completion notifications for jobs or automated steps
• Data about tool changes, auto calibration results, or offsets

4. Production Metrics

• Parts counter (number of items produced)
• Cycle and downtime reports
• Maintenance reminders

5. Diagnostic and Debug Data

• Serial debug output (firmware logs)
• Self-test results

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How the Dongle Can Relay This Data

USB Serial Relay

• Acts as a USB serial device, presenting data streams to the host PC or remote server.
• Can log, filter, or transform data for display in monitoring software.

Network Relay (via ESP32)

• Relays data to a cloud dashboard using Wi-Fi/Bluetooth.
• Sends alerts, logs, or live status to remote operators, maintenance, or analytics platforms.

Security/Tagging Layer (via RP2040)

• Intercepts and validates messages before relay.
• Tags data with timestamps or job IDs for traceability.
• Can redact or encrypt sensitive production information.

Custom Interface

• Enables live dashboards, email/SMS alerts, or integration with MES/ERP software.
• Could broker API access (ESP32 holds keys and authenticates external queries).

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Use Cases Enabled

• Remote Monitoring: View live job progress and machine health from anywhere.
• Automated Maintenance: Get notified on errors, downtime, or when intervention is needed.
• Production Analytics: Collect part counts, cycle times, and operational logs for improvement.
• Security & Traceability: Ensure records are tamper-proof and tagged for compliance.

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If you want more detail, such as sample data formats, integration ideas, or specifics for a certain CNC protocol (Fanuc, Siemens, GRBL, etc.), let me know!

[peers8862]

Certainly! Here’s how your USB dongle could receive and relay operational data from CNC machines using either Fanuc or GRBL controllers:

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Data Types from Fanuc and GRBL CNC Machines

Fanuc

Fanuc controllers are found in industrial CNC machines and support extensive status and diagnostic output via serial, including UART/USB.

Common Data Received:

• Alarm and event logs (error codes, messages)
• Operational state (e.g., RUN, STOP, READY, ALARM)
• Machine position (axis coordinates, spindle state)
• Current program block (active G-code line)
• Tool number, offsets, tool change events
• Cycle start/end signals, part counter
• System diagnostics (temperature, voltage, load if sensors provided)
• Maintenance alerts (lubrication, tool life)
• Communication: Data often output via RS-232, formatted as ASCII or in Fanuc’s proprietary protocols (such as FOCAS).

How the Dongle Relays This Data:

• Real-time stream to local terminal or PC for monitoring/logging
• Network relay via ESP32 to cloud, MES/ERP, or alerts
• Tagging and security (RP2040): Add timestamps, validate authenticity, redact sensitive fields

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GRBL

GRBL is open-source and widely used in desktop CNC and laser machines, communicating over USB/UART with plain text.

Common Data Received:

• Status reports (<Idle>, <Run>, <Hold>, <Alarm>)
• Real-time machine position (X, Y, Z coordinates)
• Active G-code (G1, G21, etc.) and currently running job
• Error reports and alarm codes
• Tool changes and offsets
• Cycle start/end and progress (if software scripts used)
• Communication: All via plain ASCII, easily parsed by your dongle.

How the Dongle Relays This Data:

• Real-time monitoring on PC via USB serial display
• Remote dashboard or alerting via ESP32 Wi-Fi/Bluetooth
• Security/tagging (RP2040): Validate, tag, or filter streams for compliance, logs, analytics

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Sample Data Formats

Fanuc Example:

Alarm: 411 "Spindle Error"
Status: RUN
Position: X=123.45 Y=67.8 Z=0.12
Tool: T05
Cycle Count: 140

Fanuc may use proprietary protocol, so you may need a parser or FOCAS library for advanced data.

GRBL Example:

<Idle|MPos:123.456,67.890,0.123|FS:500,0>
ALARM: 3

GRBL outputs are ASCII, easy for microcontrollers to process.

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Relay Use Cases

• Local monitoring: USB serial connection to PC running dashboard or terminal.
• Remote alerts: ESP32 sends job progress or error logs to cloud dashboards, phone alerts, or management systems.
• Compliance/security: RP2040 checks, tags, and logs all received data en route, ensuring tamper-proof records.

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Integration Workflow with Your Device

1. Dongle connects to CNC (via UART or USB).
2. RP2040 validates, parses, tags data.
3. Data relayed:
   • To local PC (via USB serial)
   • Or to remote/cloud (via ESP32)
4. Optional: Real-time display, automated alerts, analytics.

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If you want Python/C++/MicroPython code samples for parsing or relaying Fanuc or GRBL data, or recommendations on dashboard software, let me know your preferred tech stack or workflow!

[peers8862]

Great! Here’s a practical example and workflow for parsing and relaying CNC data (Fanuc or GRBL) using a MicroPython-based USB dongle (Tpico C3 with RP2040 + ESP32):

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1. MicroPython Setup

• RP2040: Handles UART communication and real-time parsing.
• ESP32: Can relay parsed data to Wi-Fi/Bluetooth/cloud, if needed.

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2. GRBL Data Parsing Example (MicroPython)

GRBL data is plain ASCII and lends itself well to MicroPython parsing.

import machine
import time

# Set up UART for GRBL
uart = machine.UART(0, baudrate=115200, tx=machine.Pin(0), rx=machine.Pin(1))

def parse_grbl_status(line):
    # e.g. <Idle|MPos:123.456,67.890,0.123|FS:500,0>
    if line.startswith('<') and line.endswith('>'):
        # Remove brackets
        line = line[1:-1]
        parts = line.split('|')
        status = parts[0]
        mpos = None
        for p in parts[1:]:
            if p.startswith('MPos:'):
                mpos = p[5:]
        return {'

[peers8862]

I'll do a multi-angle research pull — UART industrial protocols, GRBL/Fanuc parsing at the embedded level, and power-efficient middleware patterns for your dual-MCU architecture.

Good depth now. Let me compile this into a structured extension of Discussion #35.

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Extended Research: Discussion #35 — Industrial Machine Communication

This pulls the thread forward across four dimensions: GRBL protocol internals, RP2040 hardware architecture for UART parsing, Fanuc/FOCAS realities, and the open standards layer that sits above all of it.

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1. GRBL Protocol — Precision Details for the Parser

The original thread treated GRBL as "easy ASCII." Here's what that actually means at the byte level:

GRBL v1.1 communicates at 115200 baud, 8N1 (no parity, 8 data bits, 1 stop bit). It is full duplex. The basic unit of communication is a line, delimited by carriage return (\r) when sending to GRBL, and CR+LF (\r\n) when receiving from GRBL. GitHub

This asymmetry matters for your parser — your RX state machine needs to handle \r\n line endings, not just \n.

There are three message types: G-code blocks, system commands, and real-time control commands. Real-time commands can be sent at almost any time and are picked directly from the incoming serial stream. Of these, only ^X (0x18, soft reset) and ? (status query) produce a response. Status query responses are delimited by chevrons and match the pattern ^<.+>$. GitHub

For flow control, if no response is expected, the delay between two successive real-time commands should be at least 25ms to prevent commands being dropped. GitHub

Key architectural implication for the BABB dongle: Your RP2040 parser needs two distinct modes — a line-buffered mode for G-code/system commands, and a character-by-character intercept mode for real-time commands (0x80–0xFF range in extended ASCII). All real-time overrides and future real-time commands are defined in the extended-ASCII character space — not easily typeable, which prevents accidental commands from G-code files containing those characters. GitHub

Every message type from GRBL has a unique prefix to help GUIs immediately determine what the message is and parse it accordingly without having to know context. GitHub This makes prefix-based dispatch (< for status, [ for feedback, error:, ALARM:, ok) very efficient at the embedded level — a simple switch on the first byte routes most processing.

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2. RP2040 UART Architecture — DMA + PIO is the Right Pattern

The previous discussion stub used blocking machine.UART calls. For industrial middleware at your power and performance targets, the correct architecture is:

DMA-backed ring buffer via PIO

The RP2040's DMA controller has 12 independent channels that can run concurrently. Each DMA channel can independently read from one address and write to another, optionally incrementing one or both pointers — performing transfers on behalf of the processor while the processor carries out other tasks or enters a low power state. MicroPython

A PIO-based UART RX library with optional DMA buffering exists for the RP2040, using a ring buffer with configurable size via UART_RX_BUFFER_RING_BITS. When DMA is enabled, the library uses 2 DMA channels. The interrupt number is configurable if there are conflicts with other state machines. GitHub

Critical caveat on the hardware UART + DMA combination:

Whenever a flash page is erased on the RP2040, all CPU activities including interrupts are paused. This causes data loss when using the UART hardware FIFO, which is only 32 bytes. DMA solves this by writing incoming bytes directly into a ring buffer in RAM without CPU involvement. GitHub

This is a direct concern for your architecture: if the RP2040 is scanning/tagging files (writing to flash), it will drop UART bytes unless you're using DMA. The fix is DMA into a sufficiently large RAM ring buffer before any flash operations occur.

Dual-core division of labor (C SDK pattern):

• Core 0: UART DMA receive → ring buffer → line assembly → frame dispatch
• Core 1: Payload scanning, tagging, forwarding to ESP32 via inter-processor FIFO

Various hardware events can trigger interrupts — GPIO pin changes, timer expiry, or DMA transfer completion. The interrupt handler pattern for UART RX: set an exclusive handler with irq_set_exclusive_handler(UART_IRQ, on_uart_rx), enable it with irq_set_enabled(UART_IRQ, true). Pub

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3. FOCAS — The Hard Truth for Fanuc Integration

The previous thread treated Fanuc/FOCAS as roughly equivalent to GRBL in accessibility. It is not.

FOCAS is a set of library files (DLL) that, when embedded in an application, can access almost all information inside the CNC. The FANUC FOCAS libraries access the CNC using either Ethernet or HSSB (High-Speed Serial Bus). MachineMetrics There is no raw serial/UART access equivalent to GRBL — Fanuc's UART port is typically for DNC (Direct Numerical Control) file transfer, not live telemetry.

FOCAS is composed of two components: FOCAS1 for Ethernet communication, and FOCAS2 for HSSB. Common data available includes CNC state, part count, program name, tool and work offsets, alarm text, feed overrides, parameters, positional data, and spindle speed. MachineMetrics

The licensing barrier: FOCAS has two required components — software on the CNC side (a paid option that the machine builder must have opted into) and the PC-side library. Without the CNC-side option, even if you have the library, it won't function. Without FOCAS, the alternative is Custom MACRO B system variables. Practical Machinist

Strategic implication for BABB: Don't treat FOCAS as a UART-level interface. It lives at the Ethernet/application layer and requires Windows DLL linkage. The practical path for your dongle with legacy Fanuc machines is either the DNC serial port (G-code file transfer only, no live telemetry) or, for newer machines, acting as a lightweight Ethernet agent. For the dongle form factor, GRBL and grblHAL are the actionable near-term targets.

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4. The Open Standards Layer — MTConnect and OPC-UA

This is where the discussion needs to extend strategically for your company goals.

MTConnect is read-only, meaning machine data cannot be modified and written back to a machine. OPC UA allows reading and writing of data points. MTConnect is best suited for monitoring equipment with standardized functions like CNC controls. OPC UA is better when the machine needs specific feedback to automate its functions. MachineMetrics

MTConnect dates to 2006 and uses a well-defined data model presented in XML format over HTTP. Three software components make up an implementation: adapter (as required), agent, and client. PTC

The OPC Foundation and MTConnect organization have formed a joint working group to combine OPC UA and MTConnect into a complete industrial interoperability standard — MTConnect provides semantic definitions while OPC UA provides transport, security, scalability, and reliability. OPC Foundation

Why this matters for BABB specifically:

MTConnect's adapter layer is the insertion point for your dongle. Rather than being a proprietary monitoring device, the BABB dongle could implement the MTConnect adapter interface — making it a standards-compliant data source for any MTConnect client (dashboards, MES systems, ERP). This is a significant commercial differentiator: your device speaks the language enterprise software already understands, without requiring software integration work from the customer.

The adapter is the lightweight piece — it runs on the edge device (your dongle's ESP32), reads from the CNC via UART/Ethernet, and outputs the MTConnect data stream. The agent (which formats and serves XML over HTTP) can run on a connected PC or a small companion device.

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5. ESP32 as Transparent Bridge — Verified Pattern

DroneBridge for ESP32 implements a transparent, bidirectional serial-to-WiFi bridge. It supports standard WiFi connections to an access point and can also operate as a standalone access point. The ESP-NOW mode offers a connectionless and encrypted alternative to traditional WiFi. ArduPilot

This is a proven architecture for exactly what Discussion #35 describes — the ESP32-C3 in your Tpico C3 is well-suited to this role. The key addition from your security architecture is that the transparent bridge is not fully transparent: the RP2040 sits in the data path between the CNC UART and the ESP32, parsing and validating before forwarding.

Espressif's own USB bridge project: Espressif maintains an official esp-usb-bridge project — a USB to UART and JTAG bridge implemented on ESP32-S2 or ESP32-S3. GitHub This is directly relevant to your dongle's USB-C interface and worth reviewing as reference firmware architecture.

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Summary of Extensions to Add to Discussion #35

The thread should be extended with these threads:

1. GRBL line protocol specifics — \r\n asymmetry, real-time command byte ranges (0x80+), 25ms inter-command floor, prefix-based dispatch
2. RP2040 DMA ring buffer architecture — PIO UART RX with dual-channel DMA to avoid data loss during flash erase cycles; dual-core task split
3. FOCAS strategic reality — Ethernet/DLL-based, not UART telemetry; BABB's practical path is DNC port for Fanuc file operations, grblHAL for open-protocol machines
4. MTConnect adapter role — Positioning the BABB dongle as a standards-compliant MTConnect adapter is a significant commercial and integration advantage
5. ESP32 bridge firmware reference — Espressif's own esp-usb-bridge as structural reference for the USB-C ↔ UART ↔ WiFi path

[peers8862]

Good — got the live version index. Here's the full picture:

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State of the MTConnect / OPC UA Working Group

MTConnect Standard — Current Version Status

The current release is MTConnect Version 2.5.0, published January 5, 2026. Documents span five parts. The prior stable release was Version 2.2.0 (August 2023). The Version 2.0.0 baseline was released May 2022. mtconnect

The release cadence since going model-based has been:

Version	Date
2.0.0	May 2022
2.1.0	January 2023
2.2.0	August 2023
2.5.0	January 2026 (current)

Starting with Version 2.0, the MTConnect information model is provided in SysML using an XMI Model Interchange file rather than text documents. The 2.0 Agent was a full rewrite using a modern HTTP server and pluggable architecture, supporting TLS/certificates, extensible plug-in protocols, and third-party plug-ins including the OPC UA MTConnect Companion Spec, Kafka, InfluxDB, and MQTT data sources. AMT

Version 2.0 added maintenance data items, parts and processes vocabulary, operational modes for systems and components, support for recipes in heat-treat and PLC-based equipment, fixture support, and part counts. Design World Online

The model browser, schema files (XML and JSON), and the C++ agent are all available at model.mtconnect.org and github.com/mtconnect/cppagent.

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The Joint Working Group — What Was Actually Produced

The MOU between MTConnect Institute and OPC Foundation dates to September 2010. The JWG was formally reconstituted in April 2018 to revise the original 2014 companion specification.

The OPC Foundation and MTConnect Institute released the jointly developed "OPC Unified Architecture for MTConnect Companion Specification Part 1" in September 2019. It expresses the MTConnect stream and device information models via the OPC UA modeling language, bringing data type enforcement, separation of the information model definition from its implementation, and improved security via OPC UA end-to-end encryption. OPC Foundation

NIST tested Version 1.02 of the companion specification, developing an OPC UA Server, an OPC UA Client, a probe that translates MTConnect XML structures to the MTConnect OPC UA Companion XML format, an MTConnect XML data parser, and a device simulator. Testing confirmed that varying data structures and objects passed through the server and were received accurately by the client. NIST

A proof-of-concept Node.js implementation of the MTConnect OPC UA Companion Specification (node_mtcua_server) exists on GitHub. It uses node-opcua under the MIT license. Some lower-level details remain unimplemented. GitHub

The current specification and nodeset files are hosted at the OPC Foundation site and require a free OPC account to download. The GitHub repo is github.com/mtconnect/opc_ua_architecture.

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The UMATI Complication

This is the significant geopolitical fracture in the standards space that affects BABB's positioning.

The MTConnect/OPC UA Companion Specification may compete in part or in whole with the VDW/OPC UA Companion Specification for Machine Tools, the flagship standard of the UMATI (Universal Machine Tool Interface) brand. When a public UMATI release becomes available, the MTConnect Institute stated it would seek to harmonize and provide translation tools. MTConnect

OPC 40501 — the UMATI/VDW OPC UA for Machine Tools specification — was created by a Joint Working Group between VDW (German Machine Tool Builders' Association) and the OPC Foundation, comprising over 90 companies and nearly 200 participants worldwide. It monitors the machine tool and provides a job monitoring and management interface based on ISO 22400 KPI definitions. Available free at umati.org/ua4mt. Umati

UMATI partner machine tool providers include Citizen, Fanuc, Heidenhain, Mazak, Mitsubishi, and Okuma. For equipment already embedding MTConnect, UMATI may require a protocol adapter. MachineMetrics

So in practice there are now two competing OPC UA companion specifications for machine tools:

• MTConnect + OPC UA — North American origin, royalty-free, HTTP/XML legacy, now OPC UA native
• UMATI (OPC 40501) — German/European origin, OPC UA native from the start, broader machinery scope, stronger European machine builder adoption (Siemens, Heidenhain, DMG Mori)

Both use OPC UA as transport. They share some definitions but diverge in structure and stakeholder requirements. Commercial and open-source utilities to harmonize and co-deploy MTConnect and OPC UA are under development. MTConnect

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What This Means for BABB

Three practical conclusions:

1. MTConnect is the right near-term target for North American shops. The C++ agent is open source, actively maintained through 2.5 as of January 2026, and the adapter pattern is lightweight enough to run on the ESP32. Most North American CNC buyers and MES software vendors know MTConnect; it's the common denominator on US shop floors.

2. UMATI/OPC 40501 is the right long-term target for European and Tier-1 industrial customers. Fanuc, Heidenhain, Mazak, and Siemens are all UMATI signatories. If BABB ever sells into automotive or aerospace supply chains, UMATI compliance will be expected.

3. The adapter layer is BABB's leverage point in both cases. Neither standard prescribes what sits between the machine's physical interface and the data stream — that's where the BABB dongle lives. The dongle reads raw UART/serial, the ESP32 formats and publishes. Whether it publishes as MTConnect XML over HTTP or as an OPC UA node is a software configuration choice, not a hardware change. Building the adapter to support both output formats is the commercially durable architecture.