Comprehensive Product Summary – TRP-C24 Isolated 16-Channel Open Collector RS-485 Modbus RTU Module

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### 1. Product Overview

Product Name: TRP-C24
Model: TRP-C24
Series: TRP-C Series – Digital I/O RS-485 Modules
Article Number: TRP-C24
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)
Revision: User’s Manual Rev. 1.4, Printed September 2013

The Trycom TRP-C24 is an isolated 16-channel open collector RS-485 output module designed for industrial automation, remote control, and distributed I/O applications. It supports both ASCII and Modbus RTU communication protocols, providing flexible integration with PCs, PLCs, and other Modbus-compatible devices. The module offers 3750 Vrms isolation, dual watchdog protection, and auto-reset functionality, ensuring reliable operation in electrically noisy environments.

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### 2. Key Features

- 16 Isolated Digital Output Channels: Each channel provides an open collector output capable of driving up to 100 mA at 30 VDC.
- High Isolation Protection: 3750 Vrms optical isolation between field I/O and logic circuitry protects against voltage surges and ground potential differences.
- Dual Watchdog System: Includes both module-level (hardware) and host-level (software) watchdogs to ensure continuous operation and automatic recovery from communication or firmware faults.
- Protocol Flexibility: Supports both ASCII and Modbus RTU protocols for easy integration into various control systems.
- Wide Power Input Range: Operates from +10 VDC to +30 VDC, suitable for industrial power environments.
- Communication Speed: Auto-switching baud rate from 1.2 Kbps to 115.2 Kbps.
- Status Indication: Individual LED indicators for each output channel and a power LED for quick visual diagnostics.
- Configuration and Self-Test: External DIP switch allows protocol selection, configuration reset, and self-test mode activation.
- Mounting Options: Supports both DIN-rail and panel mounting for flexible installation.
- Connection Interface: Screw terminals for secure wiring, supporting up to AWG 12 wire gauge.
- Compact and Rugged Design: Industrial-grade enclosure with low power consumption (1.5 W) and robust environmental tolerance.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Power Input Voltage | +10 VDC to +30 VDC |
| Power Consumption | 1.5 W |
| Digital Output Channels | 16 open collector outputs |
| Output Voltage (max) | +30 VDC |
| Output Current (max) | 100 mA per channel |
| Isolation Voltage | 3750 Vrms optical isolation |
| Communication Interface | RS-485, differential 2-wire half-duplex |
| Supported Protocols | ASCII and Modbus RTU |
| Baud Rate Range | 1.2 Kbps to 115.2 Kbps (auto-switching) |
| Data Format | 8 data bits, no parity, 1 stop bit (N,8,1) |
| Communication Distance | Up to 4000 ft (1200 m) |
| Connection Type | Screw terminal, supports AWG #12–30 wire |
| Indicators | Power LED and 16 channel status LEDs |
| Mounting Options | DIN-rail or panel mount |
| Operating Temperature | 0°C to +65°C |
| Storage Temperature | -20°C to +70°C |
| Humidity | 10–90% RH, non-condensing |
| Dimensions (W x H x D) | 151 mm × 75 mm × 26 mm |
| Weight | 395 g |

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### 4. Functionality

The TRP-C24 functions as a remote digital output module on an RS-485 network. Each of its 16 open collector outputs can drive external loads such as relays, solenoids, or indicator lamps. The module communicates with a host controller (PC, PLC, or HMI) using either ASCII commands or Modbus RTU frames.

Operation Modes:
- Normal Mode: Executes host commands to set or read output states.
- Configuration Mode: Activated via DIP switch to set communication parameters or restore factory defaults.
- Self-Test Mode: Allows verification of LED and output functionality.
- Safe Mode: Triggered by watchdog timeout; outputs hold their last state until communication is restored.

Use Cases:
- Industrial automation and process control
- Remote digital output control over RS-485 networks
- Distributed I/O systems for PLCs and SCADA
- Building automation and energy management
- Machine control and equipment monitoring

Compatibility:
The TRP-C24 is compatible with any Modbus RTU master device or PC software supporting serial communication. It can be integrated with Trycom’s TRPCOM utility or third-party tools such as Modbus Poll for testing and configuration.

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### 5. Components & Accessories

Included Components:
- TRP-C24 module unit
- User manual (digital or printed)
- Mounting hardware (DIN-rail clip or panel screws)

Connectors and Terminals:
- Power Input: Screw terminal for +10–30 VDC and GND
- RS-485 Communication: DATA+ and DATA– terminals
- Digital Outputs: 16 screw terminals labeled DO0–DO15
- External Power for Isolation: EXT.PWR and EXT.GND terminals

Optional Accessories:
- External DC power adapter (10–30 VDC)
- RS-485 communication cables
- DIN-rail mounting brackets

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### 6. Installation & Setup

Power Requirements:
Supply the module with a regulated DC voltage between +10 V and +30 V. Power can be connected via screw terminal or external DC adapter.

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

Wiring Guidelines:
- Use twisted-pair shielded cable for RS-485 communication.
- Connect DATA+ and DATA– to the corresponding terminals on the RS-485 network.
- Terminate the RS-485 line properly at both ends if required.
- Connect digital outputs to external loads observing the 100 mA current limit per channel.

Configuration via DIP Switch:
- Protocol Selection:
- OFF/OFF → Modbus RTU (factory default)
- OFF/ON → ASCII mode
- Reset to Factory Defaults:
- ON/OFF → Back to initial configuration (ID=00, Baud=9600, N,8,1)
- Self-Test Mode:
- ON/ON → Enter self-test mode (requires reboot)

Default Communication Settings:
- ID Address: 01
- Baud Rate: 9600 bps
- Data Format: N,8,1
- Checksum: Disabled

Software Configuration:
- Use TRPCOM Utility (Windows) to scan, configure, and test the module.
- Set COM port (1–20), baud rate (1200–115200), and checksum options.
- Use “Terminal” mode to send ASCII commands or “Scan” to detect connected modules.

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### 7. Performance & Capabilities

Speed and Communication:
- Supports baud rates from 1.2 Kbps to 115.2 Kbps with automatic switching.
- Communication distance up to 1200 meters (4000 feet) over RS-485 differential lines.
- Reliable data transmission with CRC16 error checking in Modbus RTU mode.

Output Performance:
- Each output channel can sink up to 100 mA at 30 VDC.
- Open collector design allows flexible interfacing with external devices.
- Fast switching suitable for real-time control applications.

Isolation and Protection:
- 3750 Vrms optical isolation between logic and field circuits.
- Protects against transient voltages and ground loops.
- Dual watchdog ensures system reliability:
- Module Watchdog: Hardware-based, resets microcontroller on internal fault.
- Host Watchdog: Software-based, monitors host communication; triggers safe mode if host fails.

Safe Mode Operation:
- When watchdog timeout occurs, outputs hold their last state.
- Power LED flashes to indicate safe mode.
- Outputs remain unchanged until watchdog is disabled or communication resumes.

Limitations:
- Maximum output current per channel: 100 mA.
- Total power dissipation limited to 1.5 W.
- Operating temperature limited to 0–65°C; not suitable for extreme environments without enclosure protection.

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### 8. Standards & Compliance

Communication Standards:
- RS-485 differential signaling (TIA/EIA-485-A compliant)
- Modbus RTU and ASCII protocol compatibility

Electrical Safety:
- 3750 Vrms isolation barrier between logic and field I/O
- Designed for industrial-grade EMC immunity

Environmental Compliance:
- Operating humidity: 10–90% non-condensing
- RoHS-compliant manufacturing (lead-free components)

Quality and Reliability:
- Manufactured by Trycom Technology under ISO-certified processes
- Designed for continuous industrial operation with built-in fault recovery mechanisms

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### 9. Additional Information

Warranty:
Standard manufacturer’s warranty (typically one year, subject to Trycom’s policy) covering defects in materials and workmanship.

Technical Support:
Trycom provides technical documentation, firmware updates, and configuration utilities via its official website. Support is available through email or phone.

Maintenance:
- Periodically inspect wiring and terminal connections.
- Ensure proper ventilation and avoid exposure to excessive heat or moisture.
- Firmware updates can be applied via RS-485 interface if provided by Trycom.

Software Tools:
- TRPCOM Utility: Windows-based configuration and testing software for ASCII/Modbus communication.
- Modbus Poll: Third-party tool for testing Modbus RTU/ASCII communication, available at [modbustools.com](http://www.modbustools.com/modbus_poll.asp).

Firmware and Configuration Management:
- Module firmware version can be read using Modbus or ASCII commands.
- Configuration parameters (ID, baud rate, data format) are stored in EEPROM and can be reset via DIP switch or command interface.
- Power-on and safe-mode output states can be saved and restored automatically after power failure or reset.

Safety Notes:
- Ensure correct polarity when connecting power supply.
- Do not exceed maximum output current or voltage ratings.
- Use proper grounding and shielding for RS-485 networks to minimize noise interference.

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### Summary

The Trycom TRP-C24 is a robust, industrial-grade 16-channel isolated open collector output module designed for RS-485 networks using Modbus RTU or ASCII protocols. It provides reliable digital output control with high isolation, flexible configuration, and comprehensive safety features. With its dual watchdog system, wide power range, and industrial mounting options, the TRP-C24 is ideal for distributed control systems, automation networks, and remote I/O expansion in demanding environments.

Its combination of hardware reliability, protocol versatility, and ease of integration makes it a dependable choice for engineers and system integrators seeking a compact, high-performance digital output solution for industrial communication systems.