Comprehensive Product Summary – TRP‑C29U Isolated 8‑Channel DI and 8‑Channel Open‑Collector USB Modbus RTU Module

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### 1. Product Overview

Product Name: TRP‑C29U
Model: TRP‑C29U
Series: TRP‑C Industrial USB I/O Series
Article Number: TRP‑C29U
Manufacturer: Trycom Technology Co., Ltd.
Manufacturer Address: No. 35, Zhongxing Rd., Guishan Township, Taoyuan County 333, Taiwan
Contact: Tel: +886‑3‑350‑3351 | Fax: +886‑3‑350‑3352
Website: [www.trycom.com.tw](http://www.trycom.com.tw)

The Trycom TRP‑C29U is an industrial‑grade USB‑to‑serial digital I/O interface module that integrates eight optically isolated digital input channels and eight open‑collector digital output channels. Designed for robust field automation, monitoring, and control applications, it supports both ASCII and Modbus RTU communication protocols over a USB 2.0 interface. The module provides high isolation protection, dual watchdog functionality, and flexible mounting options for DIN‑rail or panel installations.

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### 2. Key Features

- Dual‑Function I/O: 8 optically isolated digital inputs and 8 open‑collector digital outputs.
- High Isolation Protection: 3750 Vrms optical isolation between input channels and logic circuitry.
- USB 2.0 Interface: Built‑in USB‑to‑serial bridge providing plug‑and‑play connectivity; automatically enumerates as a virtual COM port.
- Protocol Support: Fully compatible with ASCII and Modbus RTU protocols for flexible integration with industrial control systems.
- Counter Functionality: Each digital input can function as a 16‑bit counter (0–65535 dec / 0000–FFFF hex) with a maximum counting frequency of 100 Hz.
- Dual Watchdog System: Hardware watchdog for module self‑recovery and software watchdog for host communication monitoring.
- Status Indication: Individual LED indicators for each channel and power status.
- Configuration & Self‑Test: External DIP‑switch for protocol selection, configuration reset, and self‑test mode activation.
- Power Supply: Directly powered from the USB port (no external power required).
- Mounting Flexibility: Supports both DIN‑rail and panel mounting.
- Cross‑Platform Driver Support: Compatible with Windows (98/ME/2000/XP/Vista/7/8.1/CE5.0–7.0), Linux, Mac OS, and Android.
- Rugged Industrial Design: Compact metal enclosure with screw‑terminal connectors supporting AWG #12–32 wiring.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Communication Interface | USB 2.0 (built‑in USB‑to‑serial bridge) |
| Protocols Supported | ASCII, Modbus RTU |
| Digital Inputs | 8 channels, optically isolated |
| Input Isolation Voltage | 3750 Vrms |
| Input Logic Level 0 | ± 1 V (max) |
| Input Logic Level 1 | ± 4.0 V to ± 30 V |
| Input Impedance | 3 kΩ |
| Input Counter Range | 0–65535 (dec) / 0000–FFFF (hex) |
| Input Counter Frequency | 100 Hz (max) |
| Input Distance | Up to 500 m |
| Digital Outputs | 8 channels, open‑collector type |
| Output Isolation Voltage | 3750 Vrms |
| Maximum Output Voltage | ± 30 V |
| Maximum Output Current | 100 mA per channel |
| Baud Rate Range | 1.2 kbps – 115.2 kbps |
| Power Supply | USB bus‑powered (5 V DC) |
| Power Consumption | 1.2 W (max) |
| Connection Type | Screw terminal block (AWG #12–32) |
| Indicators | Power LED × 1, Channel LEDs × 16 |
| Operating Temperature | −10 °C to +50 °C |
| Storage Temperature | −20 °C to +70 °C |
| Humidity | 10 – 90 % RH (non‑condensing) |
| Dimensions (W × D × H) | 151 mm × 75 mm × 26 mm |
| Weight | 400 g |
| Mounting Options | DIN‑rail or panel mount |

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### 4. Functionality

The TRP‑C29U operates as a USB‑to‑serial digital I/O module, enabling a host computer to monitor and control external digital signals. When connected via USB, the system automatically creates a virtual COM port, allowing standard serial communication software or SCADA systems to interface with the module.

Operation Modes:
- Digital Input Mode: Each input channel detects logic levels or counts pulses. Inputs are optically isolated to protect against voltage surges and ground loops.
- Digital Output Mode: Each output channel acts as an open‑collector transistor output capable of driving external loads up to ± 30 V and 100 mA.
- Counter Mode: All eight inputs can function as independent counters for event counting or frequency measurement.
- Protocol Mode: The module can operate in ASCII or Modbus RTU mode, selectable via DIP‑switch.

Use Cases and Applications:
- Industrial automation and process control
- Remote digital signal monitoring
- Machine status and alarm indication
- Data acquisition systems
- Building automation and environmental monitoring
- Laboratory instrumentation and test setups
- Integration with PLCs, HMIs, and SCADA systems

Compatibility:
- Works with any PC or embedded system supporting USB 2.0.
- Compatible with Trycom’s TRPCOM utility software for configuration and testing.
- Supports Modbus RTU master devices and ASCII command‑based control.

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### 5. Components & Accessories

Included Items:
- TRP‑C29U module
- USB cable
- Driver and utility software CD (TRPCOM configuration tool)
- User manual (Rev 1.2, Sep 2014)

Connectors:
- Screw terminal block for all digital I/O channels and power reference lines.
- USB Type‑B connector for host connection.

Terminal Pin Assignments (simplified):
- DI0–DI7: Digital input channels 0–7
- DO0–DO7: Digital output channels 0–7 (open collector)
- IN_COM: Common terminal for digital inputs
- EXT‑PWR / EXT‑GND: External power supply for digital outputs
- RS485+ / RS485‑: Reserved pins (not active in USB mode)

Optional Accessories:
- DIN‑rail mounting kit
- Extended USB cable
- External power adapter (if required for high‑current loads)

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### 6. Installation & Setup

System Requirements:
- Host computer with available USB 2.0 port
- Supported operating system (Windows, Linux, Mac OS, Android)
- Administrative privileges for driver installation

Mounting Options:
- DIN‑Rail Mounting: Snap the module onto a standard 35 mm DIN‑rail.
- Panel Mounting: Secure using screws through the mounting holes provided.

Driver Installation:
1. Insert the supplied driver CD and select the appropriate OS driver.
2. Run the installer (e.g., `MSSetup.exe` for Windows XP/Vista/7/8).
3. Follow on‑screen prompts; ignore unsigned driver warnings if prompted.
4. After installation, connect the TRP‑C29U via USB.
5. The OS will detect the device as a “High‑Speed USB Multi‑Serial Compound Device” and assign a COM port.
6. Verify installation in Device Manager under “Ports (COM & LPT).”

Configuration DIP‑Switch:
- Switch Functions:
- Select between Modbus RTU and ASCII protocol.
- Restore factory defaults (ID = 01, baud = 9600, N‑8‑1 format).
- Enter self‑test mode.
- Factory Default Settings:
- ID Address: 01
- Baud Rate: 9600 bps
- Data Format: N, 8, 1
- Checksum: Disabled
- DIO Mode Type: 40

Self‑Test Mode:
Set DIP‑switch to “ON ON” and reboot to enter self‑test; all LEDs will toggle to verify channel operation.

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### 7. Performance & Capabilities

Speed and Throughput:
- Communication speeds adjustable from 1.2 kbps to 115.2 kbps.
- USB 2.0 interface ensures low‑latency data transfer.

Input Performance:
- Reliable detection of digital signals up to ± 30 V.
- Counter frequency up to 100 Hz for pulse counting applications.
- 3750 Vrms isolation ensures noise immunity and protection from transient voltages.

Output Performance:
- Open‑collector outputs capable of switching ± 30 V at 100 mA per channel.
- Suitable for driving relays, LEDs, or logic inputs of external devices.
- Output states can be saved to EEPROM for power‑on or safe‑mode recovery.

Watchdog and Safety Functions:
- Module Watchdog: Hardware circuit automatically resets the module in case of internal failure or noise interference.
- Host Watchdog: Software‑based timer monitors communication with the host; if timeout occurs, outputs revert to predefined safe states.
- Safe Mode: Ensures controlled shutdown of outputs during communication loss or host failure.

Limitations:
- Input counter frequency limited to 100 Hz.
- Maximum output current 100 mA per channel; external driver circuits required for higher loads.
- USB bus power limits total consumption to 1.2 W.

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### 8. Standards & Compliance

- Electrical Isolation: 3750 Vrms optical isolation between I/O and logic circuits.
- USB Compliance: Conforms to USB 2.0 Full‑Speed specifications.
- Communication Standards: Modbus RTU (ANSI X3.28) and ASCII command protocol.
- Safety & EMC: Designed for industrial environments with surge and noise immunity.
- Environmental Compliance: RoHS‑compliant construction (lead‑free).
- Operating Standards: Compatible with Modbus RTU master devices and SCADA systems adhering to Modbus over serial standards.

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### 9. Additional Information

Warranty:
Standard manufacturer warranty (contact Trycom for terms). Covers defects in materials and workmanship under normal use.

Technical Support:
- Email and phone support available through Trycom Technology Co., Ltd.
- Online resources, driver downloads, and firmware updates available at [www.trycom.com.tw](http://www.trycom.com.tw).

Maintenance:
- No periodic maintenance required.
- Keep terminals clean and free from dust or oxidation.
- Avoid exposure to excessive humidity or corrosive environments.

Firmware & Software Updates:
- Firmware version and build date can be read via ASCII or Modbus command (`$IDF`).
- Updates provided by Trycom as needed to enhance reliability or add features.
- TRPCOM utility software supports configuration, testing, and firmware management.

Documentation:
- User’s Manual Rev 1.2 (September 2014) provides detailed command sets for ASCII and Modbus RTU operation.
- Includes full command syntax for configuration, I/O control, counter management, watchdog setup, and EEPROM operations.

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### Summary

The Trycom TRP‑C29U is a compact, high‑reliability USB digital I/O module engineered for industrial automation and data acquisition. It combines 8 optically isolated digital inputs and 8 open‑collector outputs with 3750 Vrms isolation, dual watchdog protection, and cross‑platform USB connectivity. Supporting both ASCII and Modbus RTU protocols, it integrates seamlessly into PC‑based control systems, SCADA networks, and embedded applications. With its DIN‑rail mountable design, direct USB power, and comprehensive software support, the TRP‑C29U delivers a robust, flexible, and cost‑effective solution for digital signal interfacing in demanding industrial environments.