Comprehensive Product Summary – CONTEC COM-1PD(FIT)GY Ethernet 1×RS485/422 IP-Based COM Module

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### 1. Product Overview

Product Name: Ethernet 1×RS485/422 IP-Based COM Module
Model: COM-1PD(FIT)GY
Series: F&eIT Series
Article Number: COM-1PD(FIT)GY
Manufacturer: CONTEC CO., LTD. (Japan)
Product Type: Isolated RS-422A/485 1-channel communication module for Ethernet-based serial communication
Intended Use: Expansion COM port for F&eIT series microcontroller units or media converters (e.g., RP-COM(FIT)H, RP-COM(FIT)H-AF, FX-DS540-COM2)

The COM-1PD(FIT)GY is a compact, DIN-rail mountable communication module designed to provide a single isolated RS-422A/485 serial interface over an Ethernet-based system. It functions as a virtual COM port, enabling seamless integration of serial devices into IP-based industrial networks. The module is part of CONTEC’s F&eIT modular system, which allows stackable, backplane-free configurations for flexible system design.

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### 2. Key Features

- RS-422A/485 Serial Communication: Supports full-duplex and half-duplex asynchronous serial communication.
- Electrical Isolation: Complete bus isolation between communication lines and internal circuitry (1000 VDC isolation voltage).
- High-Speed Data Transfer: Supports baud rates from 2 bps up to 921,600 bps (115,200 bps in compatible mode).
- Configurable Baud Rate: Baud rate and communication parameters can be set via software.
- FIFO Buffers: 128-byte transmit and 128-byte receive FIFO buffers reduce CPU load and improve throughput.
- Software-Selectable Modes: Operates in either *compatible mode* (standard COM3/COM4) or *enhanced mode* (CONTEC proprietary control).
- Automatic RTS Control: Hardware-based RTS/CTS control for half-duplex communication minimizes CPU overhead.
- Surge Protection: All RS-422A/485 signal lines are surge-protected for industrial reliability.
- DIN Rail Mounting: Integrated 35 mm DIN rail clip for easy installation and modular stacking.
- Terminator Switches: Built-in 100 Ω termination resistors can be enabled/disabled via DIP switches for multi-drop configurations.
- Device ID Configuration: Rotary switch for setting device ID and I/O address mapping.
- LED Indicators: Separate TX and RX LEDs for real-time communication status.
- Driver Support: Includes Windows and Linux drivers for virtual COM port operation.
- Expansion Capability: Up to three modules can be added as expansion ports in enhanced mode (two in compatible mode).
- Compact and Lightweight: Designed for space-constrained control panels and embedded systems.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Number of Channels | 1 channel |
| Interface Type | RS-422A / RS-485 |
| Transfer Method | Asynchronous serial transfer (Full/Half duplex) |
| Baud Rate Range | 2 – 921,600 bps (software selectable) |
| Data Length | 5, 6, 7, or 8 bits |
| Stop Bits | 1, 1.5, or 2 bits |
| Parity | Even, Odd, or None |
| Isolation Voltage | 1000 VDC (bus isolation) |
| Controller Chip | XR16C2850 or equivalent (162850) |
| FIFO Buffers | 128-byte transmit / 128-byte receive |
| Interrupt Requests | 1 level used |
| Power Supply | 5 VDC ±5% |
| Power Consumption | 300 mA (max.) |
| Communication Distance | Up to 1200 m (depending on baud rate and cable type) |
| Recommended Cable | 28 AWG double-shielded twisted pair |
| Dimensions (W × D × H) | 25.2 × 64.7 × 94.0 mm (excluding protrusions) |
| Weight | Approx. 100 g |
| Mounting Method | 35 mm DIN rail (standard) |
| Operating Temperature | 0 – 50 °C |
| Storage Temperature | -10 – 60 °C |
| Humidity | 10 – 90% RH (non-condensing) |
| Corrosive Gases / Dust | None / Not excessive |
| Isolation Type | Bus isolation between communication lines and internal circuits |
| Surge Protection | Provided on all RS-422A/485 signal lines |
| Compliance | FCC Part 15 Class A, VCCI Class A, EMC Directive Class A |

Typical Communication Distance vs. Baud Rate:
- 115,200 bps → 300 m
- 57,600 bps → 600 m
- 19,200 bps → 900 m
- 9,600 bps → 1200 m

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### 4. Functionality

The COM-1PD(FIT)GY enables serial communication between Ethernet-based controllers and RS-422A/485 devices. It can act as a virtual COM port, allowing legacy serial devices to be accessed over IP networks without hardware modification.

Operating Modes:
- Compatible Mode: Emulates standard COM3/COM4 ports using standard I/O addresses (03E8h, 02E8h). Suitable for legacy applications and standard serial drivers.
- Enhanced Mode: Uses CONTEC’s proprietary control method with extended I/O address mapping (01A0h–9867h). Enables up to three expansion modules and advanced interrupt handling.

Communication Control:
- Supports RTS/CTS hardware flow control.
- Automatic RTS switching in half-duplex mode.
- Configurable terminators for multi-drop RS-485 networks.
- Software-adjustable FIFO trigger levels for optimized performance.

Applications:
- Industrial automation and control systems.
- Data acquisition and monitoring.
- Serial device networking (sensors, PLCs, barcode readers).
- Integration of RS-485/422 devices into Ethernet-based SCADA systems.
- Expansion of serial ports on CONTEC microcontroller units or media converters.

Compatibility:
- Compatible with CONTEC CPU-SB303-FIT and other F&eIT series controllers.
- Works with CONTEC media converters (RP-COM(FIT)H, RP-COM(FIT)H-AF, FX-DS540-COM2).
- Supported by Windows and Linux operating systems via supplied drivers.

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### 5. Components & Accessories

Package Contents:
- COM-1PD(FIT)GY module × 1
- First Step Guide × 1
- CD-ROM (F&eIT Series Setup Disk) × 1
- Includes drivers, utilities, and user manuals.

Connectors:
- Interface Connector: 9-pin D-SUB (female), JAE DELC-J9SAF-20L9 or equivalent.
- Compatible Mating Connectors:
- DDK 17JE-23090-02(D8C) (male)
- CONTEC CN5-D9M (male)

Signal Pinout (CH0):
1. TxD−
2. TxD+
3. RTS−
4. RTS+
5. SG (Signal Ground)
6. RxD−
7. RxD+
8. CTS+
9. CTS−

Accessories (Optional):
- Ferrite cores (SEIWA E04SR301334 or equivalent) for EMC compliance.
- Shielded twisted-pair communication cables.

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### 6. Installation & Setup

Mounting:
- Standard 35 mm DIN rail mounting with one-touch mechanism.
- Stackable side connectors allow lateral expansion without backplane boards.

Configuration:
- Device ID Setting: Rotary switch on front panel (0–F). Determines I/O address and interrupt level.
- Transmission Mode Switch: Selects full-duplex or half-duplex operation and RTS/CTS usage.
- Terminator Switch: Enables/disables internal 100 Ω termination resistors for each signal line.
- LED Indicators:
- RX (green): Receiving data
- TX (green): Transmitting data

Installation Procedure (CPU-SB303-FIT Example):
1. Power off the controller before connecting the module.
2. Mount the module on the DIN rail and connect via stack connector.
3. Configure Device ID and mode switches.
4. Install drivers from the supplied CD-ROM.
5. Verify I/O address and IRQ settings in the operating system.
6. Restart the system and confirm COM port recognition.

Environmental Requirements:
- Operating temperature: 0–50 °C
- Humidity: 10–90% RH (non-condensing)
- Avoid exposure to vibration, shock, magnetic fields, or corrosive gases.

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### 7. Performance & Capabilities

- Maximum Baud Rate: 921,600 bps (enhanced mode)
- FIFO Buffers: 128-byte transmit and receive buffers reduce CPU load.
- Clock Modes: Four selectable clock frequencies (1.8432, 3.6864, 7.3728, 14.7456 MHz).
- Communication Distance: Up to 1200 m (depending on baud rate and cable).
- Isolation: 1000 VDC bus isolation ensures noise immunity and protection.
- Surge Protection: Built-in surge absorbers on all signal lines.
- Automatic RTS Control: Hardware-based switching for half-duplex communication.
- Enhanced Mode Interrupt Handling: Dedicated interrupt vector register for efficient event-driven communication.
- Limitations:
- High-speed transmission may be affected by cable quality and environmental noise.
- Device IDs 8–B not recommended for Windows environments.
- Total current draw must not exceed controller power supply capacity.

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### 8. Standards & Compliance

- EMC Compliance:
- FCC Part 15 Class A
- VCCI Class A
- EMC Directive Class A (industrial environment)
- Safety:
- Designed for industrial use; not intended for residential environments.
- Requires ferrite cores on communication cables for full EMC compliance.
- Environmental:
- RoHS-compliant manufacturing (lead-free).
- Isolation & Protection:
- 1000 VDC isolation between communication lines and internal circuits.
- Surge protection on all RS-422A/485 lines.

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### 9. Additional Information

Warranty:
- Limited one-year warranty from the date of purchase.
- Covers defects in materials and workmanship.
- Excludes damage from misuse, modification, or environmental factors.
- Repairs require Return Merchandise Authorization (RMA) and proof of purchase.

Support & Resources:
- Websites:
- Japanese: [http://www.contec.co.jp/](http://www.contec.co.jp/)
- English: [http://www.contec.com/](http://www.contec.com/)
- Chinese: [http://www.contec.com.cn/](http://www.contec.com.cn/)
- Downloads:
- Latest drivers, manuals, and sample programs available online.
- Technical Support:
- Contact local CONTEC distributor or regional office for assistance.

Maintenance:
- Periodically inspect ventilation slits and connectors for dust or debris.
- Store in original packaging when not in use.
- Dispose of the product according to local electronic waste regulations.

Revision Information:
- User’s Manual Edition: November 2007
- Management No.: A-46-812
- Parts No.: LYDC894
- Revision: [11132007_rev5]

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### Summary

The CONTEC COM-1PD(FIT)GY is a robust, high-performance RS-422A/485 communication module engineered for industrial Ethernet systems. Its combination of electrical isolation, surge protection, and flexible configuration options make it ideal for integrating serial devices into modern networked environments. With support for both standard and enhanced operating modes, software-configurable parameters, and DIN-rail modularity, it provides a scalable and reliable solution for industrial automation, data acquisition, and embedded control applications.