Comprehensive Product Summary – Dataforth MAQ20‑COM2 Communication Ethernet USB RS‑232 Module

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### 1. Product Overview

Product Name: MAQ20‑COM2 Communication Ethernet USB RS‑232 Module
Model Number: MAQ20‑COM2
Series: MAQ®20 Industrial Data Acquisition and Control System
Article Number: MAQ20‑COM2
Manufacturer: Dataforth Corporation, Tucson, Arizona, USA
Quality System: ISO 9001:2008‑Registered QMS

The MAQ20‑COM2 is the primary communications interface module for Dataforth’s MAQ®20 modular data acquisition and control platform. It provides Ethernet, USB, and RS‑232 connectivity between a host computer or network and a MAQ20 system backbone populated with analog and discrete I/O modules. The COM2 module supplies system power, manages module registration, and supports autonomous operation with integrated data logging, Modbus protocol handling, and optional PID control functionality.

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### 2. Key Features

- Multi‑interface communications:
- Ethernet 10/100 Base‑T (compatible with 1000 Base‑T) using Modbus TCP
- USB 2.0 Type B interface using proprietary Modbus RTU over USB
- RS‑232 serial port (RJ‑45) using Modbus RTU

- Integrated power distribution:
- Accepts +7 to +34 VDC input @ 2 A max
- Provides 5 VDC @ 3 A max to system bus

- High‑performance industrial design:
- 1500 Vrms channel‑to‑bus isolation
- 240 Vrms continuous field I/O protection
- ANSI/IEEE C37.90.1 transient protection
- Operating temperature –40 °C to +85 °C

- System capacity and scalability:
- Supports up to 24 I/O modules (384 channels) per system
- Automatic module registration and hot‑swap capability
- DIN‑rail backbone expansion with 1 m or 2 m cables

- Autonomous operation:
- Internal microSD data logger (up to 4 GB)
- Integrated FTP server for remote file access
- Built‑in Modbus server for remote control via Ethernet
- Real‑time clock for timestamped data logging

- Software ecosystem:
- ReDAQ Shape graphical HMI and control software
- Configuration Software Tool for setup and diagnostics
- LabVIEW VIs and examples
- Modbus TCP/RTU compatibility for third‑party SCADA systems

- Compliance and safety:
- CE compliant, UL/CUL Class I Div 2 pending, ATEX pending
- Designed for industrial and hazardous environments

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Model | MAQ20‑COM2 |
| Interfaces | Ethernet 10/100 Base‑T (1000 Base‑T compatible); USB 2.0 Type B; RS‑232 (RJ‑45) |
| Protocols | Modbus TCP (Ethernet), Modbus RTU (USB/RS‑232) |
| Input Power | +7 to +34 VDC @ 2 A max |
| Output Power to Bus | 5 VDC @ 3 A max |
| Isolation | 50 V Power‑to‑Bus and Comms‑to‑Bus |
| Transient Protection | ANSI/IEEE C37.90.1 |
| Dimensions (H × W × D) | 114.6 × 28.2 × 82.8 mm (4.51 × 1.11 × 3.26 in) |
| Weight | ≈ 0.25 kg (typical) |
| Mounting | 35 mm DIN rail with MAQ20‑BKPL backbone |
| Operating Temperature | –40 °C to +85 °C |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 0 – 95 % non‑condensing |
| Emissions (EN61000‑6‑4) | ISM Group 1, Class A radiated and conducted |
| Immunity (EN61000‑6‑2) | ISM Group 1, RF Performance A, ESD/EFT Performance B |
| Certifications | CE, UL/CUL pending, ATEX pending |
| Quality System | ISO 9001:2008 Registered QMS |

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### 4. Functionality

System Role:
The MAQ20‑COM2 serves as the central communications and power hub for a MAQ20 system. It interfaces with a host PC or network and manages all I/O module communications over the system backbone.

Operation:
- Acts as a Modbus server, responding to client requests over Ethernet, USB, or RS‑232.
- Handles automatic registration of I/O modules and maintains a consistent Modbus address map.
- Provides real‑time data acquisition, logging, and control without a dedicated PC.
- Supports simultaneous multi‑port operation (Ethernet + USB + RS‑232).

Use Cases and Applications:
- Industrial process monitoring and control
- Distributed data acquisition systems
- Laboratory and test automation
- Remote asset monitoring via Ethernet or Internet
- Integration with SCADA, PLC, and LabVIEW environments

Compatibility:
Fully compatible with all MAQ20 I/O modules (analog input/output, thermocouple, RTD, discrete I/O, strain gage, frequency, etc.) and supports up to 24 modules per system.

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### 5. Components & Accessories

Included Items:
- MAQ20‑COM2 module
- 4 GB microSD card and USB adapter
- Quick Start Guide (MA1036)

Optional Accessories:
- Backbones: MAQ20‑BKPL4/8/16/24 for 4 to 24 I/O modules
- Expansion Cables: MAQ20‑XCA01 (1 m), MAQ20‑XCA02 (2 m)
- Ethernet Cables: SLX141‑01/‑02/‑07 (straight), SLX141‑X01/‑X02/‑X07 (crossover)
- USB Cables: SLX147‑01/‑02/‑05 (Type A to Type B)
- RS‑232 Adapters: SLX142 (pre‑wired RJ‑45 to DB‑9), SLX143 (configurable)
- Power Supply Module: MAQ20‑PWR3 for additional load‑sharing power

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### 6. Installation & Setup

Mounting:
- Snap the MAQ20‑BKPL backbone onto a 35 mm DIN rail with the “UP” arrow oriented correctly.
- Insert the MAQ20‑COM2 into the left‑most slot of the backbone.
- Add I/O modules to remaining slots in any order.

Connections:
- Power: +7 to +34 VDC to top terminal block (1 = +V, 2 = +V, 3 = Shield/GND).
- Ethernet: RJ‑45 port to PC or switch using Cat 5/5e cable.
- USB: Type B port to PC (install Dataforth USB driver before connection).
- RS‑232: RJ‑45 port to DB‑9 adapter for serial communication.

Configuration:
- Default Ethernet IP 192.168.128.100, Subnet 255.255.0.0, Port 502.
- Default RS‑232 baud 115200, 8 data bits, 1 stop bit, even parity, Slave ID 16.
- Use Dataforth Configuration Software Tool or ReDAQ Shape to set parameters.

System Registration:
Upon power‑up, the COM2 automatically detects and registers all connected I/O modules, assigning sequential registration numbers and address spaces (2000 addresses per module).

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### 7. Performance & Capabilities

Throughput and Speed:
- Modbus TCP command rate ≈ 44 commands/s (single channel)
- RS‑232 Modbus RTU ≈ 42 commands/s (single channel)
- USB Modbus RTU ≈ 43 commands/s (single channel)
- Typical analog read throughput ≈ 180 channels/s (Ethernet)

Data Logging:
- microSD card up to 4 GB capacity
- Log interval 100 ms to 49.7 days (4,294,967,296 ms)
- Up to 4 start addresses × 100 registers each (400 registers total)
- Time‑stamped records using real‑time clock

FTP Server:
- Passive and active modes supported
- Default user “maq20”, password “1234”, anonymous login enabled
- Commands: DIR, GET, DEL, QUIT

Real‑Time Clock:
- Registers 1200–1206 (Seconds, Minutes, Hours, Day, Date, Month, Year)
- Used for data logging and timestamping

PID Control Capability:
- Up to 32 independent PID loops executed in the COM2 module
- 1 s update rate per loop
- Configurable via ReDAQ Shape PID Faceplate
- Supports P, PI, PID algorithms (non‑interactive or parallel)
- Auto‑tuning function for loop optimization

Reliability Features:
- Brown‑out detection and watchdog timer
- Standard and Reset‑to‑Default firmware reset functions
- Hot‑swappable I/O modules with automatic re‑registration

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### 8. Standards & Compliance

- Electrical Safety: ANSI/IEEE C37.90.1 transient protection
- EMC Compliance: EN61000‑6‑2 (industrial immunity), EN61000‑6‑4 (industrial emissions)
- Environmental: Designed for Class I Div 2 hazardous locations (UL/CUL pending)
- Quality System: Manufactured under ISO 9001:2008 QMS
- Regulatory Marks: CE marking for industrial environments

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### 9. Additional Information

Warranty:
- Hardware products: 1 year from date of delivery
- Software products: 30 days from delivery
- Special products: 60 days
- Warranty covers defects in materials and workmanship; excludes misuse or improper installation.

Support & Service:
- Technical Support: techinfo@dataforth.com
- Phone: +1 520‑741‑1404 or 1‑800‑444‑7644 (toll‑free US)
- Fax: +1 520‑741‑0762
- Website: [www.dataforth.com](http://www.dataforth.com)
- Address: Dataforth Corporation, 3331 E. Hemisphere Loop, Tucson, AZ 85706 USA

Maintenance & Updates:
- Firmware and software updates available via Dataforth website
- Periodic inspection of DIN‑rail mount and terminal connections recommended
- Use anti‑static handling precautions during installation or module replacement

Return Procedure:
- Obtain RMA number from Customer Service before returning any product
- Include model and serial number, contact information, and repair instructions
- Ship prepaid to Dataforth Corporation, Tucson, AZ

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### Summary

The Dataforth MAQ20‑COM2 is a robust, high‑performance communications and power module forming the core of the MAQ®20 modular data acquisition and control system. It integrates Ethernet, USB, and RS‑232 interfaces with Modbus TCP/RTU protocols, enabling flexible connectivity for industrial automation, process control, and remote monitoring. With built‑in data logging, FTP server, real‑time clock, and optional PID control, the MAQ20‑COM2 supports both local and distributed architectures. Its rugged design, wide temperature range, and compliance with industrial standards make it suitable for demanding environments requiring reliable, scalable, and easily configurable data acquisition solutions.