Comprehensive Product Summary: TRP-C29 Isolated 8-Channel Digital I/O RS485 Modbus RTU Module

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### 1. Product Overview

Product Name: TRP-C29
Model: TRP-C29
Series: TRP-C Series – Industrial RS485 Digital I/O Modules
Article Number: TRP-C29
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-C29 is an industrial-grade isolated 8-channel digital input and 8-channel open-collector digital output RS485 module supporting both ASCII and Modbus RTU protocols. Designed for robust field automation and remote control applications, it provides high isolation, surge protection, and flexible configuration options for reliable operation in harsh industrial environments.

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### 2. Key Features

- 8 Isolated Digital Inputs and 8 Open-Collector Outputs:
Each input and output channel is optically isolated to 3750 Vrms, ensuring electrical protection and noise immunity.

- Dual Communication Protocols:
Supports both ASCII and Modbus RTU protocols for flexible integration with various control systems and SCADA platforms.

- Wide Baud Rate Range:
Configurable communication speeds from 1.2 kbps to 115.2 kbps, compatible with most RS485 networks.

- Counter Functionality:
All 8 digital input channels can function as 16-bit counters (0–65535 dec / 0000–FFFF hex) with a maximum counting frequency of 100 Hz.

- Dual Watchdog System:
Includes both hardware and software watchdogs to ensure continuous operation and automatic recovery from communication or system faults.

- LED Indicators:
Individual LEDs for each channel display real-time input/output status, plus a power LED for system monitoring.

- Flexible Mounting Options:
Supports DIN rail and panel mounting, suitable for control cabinets and industrial enclosures.

- Surge and Isolation Protection:
3750 Vrms isolation on I/O channels and surge protection on RS485 lines safeguard against voltage spikes and ground potential differences.

- User-Friendly Configuration:
External DIP-switch allows quick selection between Modbus RTU and ASCII modes, self-test activation, and reset to factory defaults.

- Power Supply Flexibility:
Operates from a wide DC input range via screw terminal or external DC adapter connection.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Input Channels | 8 digital inputs |
| Input Isolation | 3750 Vrms optical isolation |
| 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 |
| Output Channels | 8 open-collector digital outputs |
| Output Voltage (max) | ±30 V |
| Output Current (max) | 100 mA per channel |
| Output Isolation | 3750 Vrms |
| Communication Interface | RS-485 (2-wire, half-duplex) |
| Communication Speed | 1.2 kbps to 115.2 kbps |
| Power Supply | External DC via screw terminal or DC adapter |
| Power Consumption | 1.2 W |
| Connection Type | Screw terminal, supports AWG #12–#32 wires |
| Operating Temperature | -10 °C to +50 °C |
| Storage Temperature | -20 °C to +70 °C |
| Humidity | 10–90% RH, non-condensing |
| Dimensions | 151 mm × 75 mm × 26 mm |
| Weight | 400 g |
| Mounting | DIN rail or panel mount |

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### 4. Functionality

The TRP-C29 functions as a remote digital I/O expansion module for RS485 networks. It allows a host computer, PLC, or SCADA system to monitor digital inputs and control digital outputs over long distances (up to 500 m).

Operation Modes:
- Digital Input Mode: Detects logic levels or counts pulses on each input channel. Each input can act as a counter channel for event counting or frequency measurement.
- Digital Output Mode: Controls external devices such as relays, lamps, or actuators via open-collector outputs.
- Communication Mode: Operates in either ASCII or Modbus RTU protocol, selectable via DIP-switch.
- Self-Test Mode: Allows diagnostic testing of I/O channels and communication functions.
- Safe Mode: Automatically activates predefined output states when communication is lost or watchdog timeout occurs.

Use Cases and Applications:
- Industrial automation and process control
- Remote monitoring and data acquisition (SCADA)
- Building management systems (BMS)
- Machine control and equipment status monitoring
- Energy management and environmental monitoring
- Security and access control systems

Compatibility:
- Compatible with Modbus RTU master devices, PLCs, and PC-based control systems.
- Works with Trycom’s TRPCOM utility software for configuration and testing under Windows environments.

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### 5. Components & Accessories

Included Items:
- TRP-C29 module unit
- User manual (Rev. 1.3, printed September 2013)
- Configuration utility software (TRPCOM) on CD
- Mounting hardware for DIN rail/panel installation

Optional Accessories:
- External DC power adapter
- RS485 communication cables
- Terminal blocks and wiring accessories

Connectors:
- Screw terminals for all I/O and power connections
- RS485 interface terminals for network communication

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### 6. Installation & Setup

Power Requirements:
- Operates from a DC power source (wide input range).
- Power can be supplied via screw terminal or external DC adapter.

Mounting Options:
- DIN rail mount: For standard industrial control panels.
- Panel mount: For fixed installations or enclosures.

Configuration:
- DIP-switch settings:
- Select between Modbus RTU and ASCII communication modes.
- Reset to factory defaults (ID=01, baud rate=9600 bps, N,8,1 format).
- Enter self-test mode for diagnostics.

Communication Wiring:
- RS485 2-wire half-duplex connection.
- Supports multi-drop network topology with up to 247 devices.
- Surge protection on RS485 lines ensures reliable communication.

Software Setup:
- Use TRPCOM utility to configure module ID, baud rate, data format, and checksum settings.
- Supports online scanning and automatic detection of connected modules.
- Provides terminal interface for sending ASCII commands and monitoring responses.

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### 7. Performance & Capabilities

Speed and Communication:
- Baud rates from 1.2 kbps to 115.2 kbps.
- Supports N,8,1 data format (no parity, 8 data bits, 1 stop bit).
- Reliable communication over distances up to 500 m.

Capacity and Counters:
- Each input channel can count up to 65535 events (16-bit counter).
- Counter frequency up to 100 Hz.
- Counter values can be saved to EEPROM for retention after power loss.

Efficiency and Reliability:
- Dual watchdog system ensures continuous operation:
- Module watchdog: Hardware reset circuit for self-recovery.
- Host watchdog: Monitors communication; triggers safe mode if host fails.
- Safe Mode Operation:
- When communication is lost, outputs revert to predefined safe states.
- Prevents unintended activation of connected devices.

Limitations:
- Output current limited to 100 mA per channel.
- Designed for low-voltage control signals; not suitable for direct high-power switching.
- Operating temperature limited to -10 °C to +50 °C.

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### 8. Standards & Compliance

Communication Standards:
- RS485 (EIA/TIA-485) compliant interface.
- Modbus RTU and ASCII protocol support for interoperability with industrial systems.

Electrical Safety:
- 3750 Vrms isolation between I/O channels and system logic.
- Surge protection on RS485 lines for transient voltage suppression.

Environmental Compliance:
- Designed for industrial environments with 10–90% non-condensing humidity.
- Conforms to general EMC and safety requirements for industrial control equipment.

Quality and Manufacturing:
- Manufactured by Trycom Technology Co., Ltd., ISO-certified facility in Taiwan.
- Subject to continuous improvement and design updates for reliability and performance.

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### 9. Additional Information

Warranty and Support:
- Standard manufacturer warranty (duration per Trycom policy).
- Technical support available via Trycom’s website and service channels.
- Firmware updates and configuration utilities downloadable from [www.trycom.com.tw](http://www.trycom.com.tw).

Maintenance:
- Minimal maintenance required; periodic inspection of wiring and terminal connections recommended.
- Ensure proper ventilation and avoid exposure to excessive humidity or vibration.

Firmware and Software Updates:
- Firmware version can be read via command `$IDF`.
- Example response: `!01C29M0703` indicates firmware date (YYMMDD format).
- Updates may include performance enhancements or protocol improvements.

Utility Software (TRPCOM):
- Windows-based configuration and testing tool.
- Functions include:
- COM port and baud rate setup (1200–115200 bps).
- Module scanning and identification.
- Digital input/output monitoring and control.
- EEPROM configuration writing.
- Factory default communication settings:
- ID: 01
- Baud Rate: 9600 bps
- Checksum: Disabled
- Mode: ASCII (switch position OFF/ON)

Documentation and Revision:
- User Manual: TRP-C29 Rev. 1.3 (September 2013)
- All specifications subject to change without notice for product improvement.

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### Summary

The Trycom TRP-C29 is a robust, high-isolation 8-channel digital input and 8-channel open-collector output RS485 module engineered for industrial automation and remote I/O control. Its dual-protocol support (ASCII and Modbus RTU), flexible configuration, and built-in safety mechanisms make it ideal for distributed control systems requiring reliable digital signal acquisition and actuation over long distances.

With 3750 Vrms isolation, dual watchdog protection, and surge-resistant RS485 communication, the TRP-C29 ensures dependable operation in electrically noisy environments. Its counter-capable inputs, safe mode outputs, and user-friendly configuration tools provide versatility for a wide range of automation, monitoring, and control applications.

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Manufacturer: Trycom Technology Co., Ltd.
Product: TRP-C29 Isolated 8 CH DI / 8 CH O.C RS485 Modbus RTU Module
Website: [www.trycom.com.tw](http://www.trycom.com.tw)
Weight: 400 g | Dimensions: 151 × 75 × 26 mm | Power: 1.2 W DC

*All information is based on Trycom documentation (Rev. 1.3, 2013) and subject to change without prior notice.*