1. Product Overview

Product Name: RS-232C (2ch) Communication Module
Model: COM-2(FIT)GY
Series: F&eIT Series (Factory and Enterprise IT)
Article Number: COM-2(FIT)GY
Manufacturer: CONTEC CO., LTD., Osaka, Japan

The COM-2(FIT)GY is a dual-channel RS-232C serial communication module designed for integration within CONTEC’s F&eIT distributed monitoring and control network. It provides two independent asynchronous serial ports for data exchange between controllers, servers, and external devices. The module is DIN-rail mountable, stackable, and fully compatible with CONTEC’s microcontroller units, I/O controllers, and media converters. It is engineered for industrial environments requiring compact, reliable, and high-speed serial communication over Ethernet-based control systems.

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2. Key Features

- Dual RS-232C Channels: Two independent serial communication channels (CH0 and CH1) supporting full-duplex asynchronous data transfer.
- High-Speed Communication: Software-selectable baud rates from 2 bps up to 921,600 bps (115,200 bps in compatible mode).
- FIFO Buffers: 128-byte transmit and 128-byte receive FIFO buffers per channel reduce CPU load and ensure stable high-speed data transfer.
- Software-Configurable Parameters: Baud rate, data length (5–8 bits), stop bits (1, 1.5, or 2), and parity (even, odd, none) can be configured via software.
- Dual Operating Modes:
- *Compatible Mode*—operates as standard COM3/COM4 ports for legacy compatibility.
- *Enhanced Mode*—uses CONTEC’s proprietary control method, allowing two channels to share a single interrupt level.
- Flexible Expansion: Up to three COM-2(FIT)GY modules can be stacked in enhanced mode, providing up to six RS-232C ports per controller.
- DIN Rail Mounting: Integrated 35 mm DIN rail clip for quick installation and removal.
- Stackable F&eIT Bus Interface: Side-mounted connectors allow direct stacking with other F&eIT modules without backplanes.
- LED Indicators: Independent RX/TX LEDs for each channel provide real-time communication status.
- Industrial Durability: Fanless, compact, and vibration-resistant design suitable for factory automation and embedded control systems.
- Cross-Platform Driver Support: Recognized as standard COM ports under Windows® and Linux; compatible with CONTEC’s API-SBP(W32) and COM-DRV(W32) driver libraries.
- Safety and Compliance: FCC Class A certified, CE compliant, and designed to meet IEC1000-4-4 Level 3 noise immunity standards.

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3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Number of Channels | 2 (CH0, CH1) |
| Interface Type | RS-232C (EIA/TIA-232 standard) |
| Transmission Method | Asynchronous serial, full-duplex |
| Baud Rate Range | 2 to 921,600 bps (software-selectable) |
| Data Length | 5, 6, 7, or 8 bits |
| Stop Bits | 1, 1.5, or 2 |
| Parity | Even, Odd, None |
| Controller Chip | XR16C2850 or equivalent (Exar Corp.) |
| FIFO Buffers | 128-byte transmit / 128-byte receive per channel |
| Interrupt Levels | 1 or 2 (configurable by Device ID) |
| Power Supply | 5 VDC ±5% |
| Power Consumption | 100 mA (max.) |
| Communication Distance | Up to 15 m (RS-232C standard) |
| Dimensions | 25.2 (W) × 64.7 (D) × 94.0 (H) mm (excluding protrusions) |
| Weight | Approx. 100 g |
| Mounting | 35 mm DIN rail (standard) |
| Connection Method | Stack connection via F&eIT bus connector |
| Operating Temperature | 0 to 50 °C |
| Storage Temperature | -10 to 60 °C |
| Operating Humidity | 10 to 90% RH (non-condensing) |
| Vibration Resistance | 10–57 Hz, 0.15 mm amplitude; 57–150 Hz, 2.0 G (IEC68-2-6) |
| Shock Resistance | 15 G, 11 ms half-sine (IEC68-2-27) |
| Noise Immunity | AC line 2 kV, signal line 1 kV (IEC1000-4-4 Level 3) |
| Static Electricity Resistance | Contact discharge 4 kV, air discharge 8 kV |
| Grounding | D-type (former Class 3) |
| Case Material | Industrial-grade plastic enclosure |
| Cooling | Natural air cooling (fanless) |

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4. Functionality

The COM-2(FIT)GY functions as a serial communication interface module within the F&eIT distributed control architecture. It enables data exchange between controllers, servers, and external RS-232C devices such as PLCs, sensors, barcode readers, and modems.

- Operation Modes:
- *Compatible Mode:* Emulates standard PC COM ports (COM3/COM4). Each channel uses a separate interrupt (IRQ5/IRQ7). Ideal for legacy applications and standard serial communication software.
- *Enhanced Mode:* Employs CONTEC’s proprietary interrupt-sharing mechanism, allowing both channels to operate on a single interrupt line. This mode supports higher integration and reduced CPU overhead.

- Baud Rate Configuration:
Baud rate is set via software registers. Supported clock modes (0–3) correspond to internal clock frequencies of 1.8432, 3.6864, 7.3728, and 14.7456 MHz. The baud rate generator allows precise configuration for standard and custom speeds.

- FIFO Operation:
The 128-byte FIFO buffers operate in a first-in, first-out manner, minimizing interrupt frequency and improving throughput. FIFO trigger levels can be adjusted to balance latency and CPU load.

- Device ID Configuration:
A rotary switch on the front panel assigns a Device ID (0–F), determining I/O address and interrupt level. IDs 0–3 correspond to compatible mode; IDs 4–D correspond to enhanced mode.

- LED Indicators:
Each channel features independent RX (receive) and TX (transmit) LEDs for visual monitoring of communication activity.

- Software Integration:
The module is recognized as a standard COM port under Windows® and Linux. It supports CONTEC’s COM-DRV(W32) driver for enhanced mode operation and is compatible with API-SBP(W32) for application development.

- Use Cases:
- Expansion of serial ports on F&eIT microcontrollers (e.g., CPU-SB20/21/10 series).
- Integration with media converters (RP-COM(FIT)H, RP-COM(FIT)H-AF, FX-DS540-COM2).
- Connection to RS-232C-based industrial devices for data acquisition, control, or monitoring.
- Embedded serial communication in distributed automation systems.

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5. Components & Accessories

Included Items:
- COM-2(FIT)GY module (1 unit)
- First Step Guide (1 copy)
- CD-ROM “F&eIT Series Setup Disk” (includes drivers, manuals, and utilities)

Optional Accessories:
- Power Supplies:
- POW-AD13GY (AC-DC 85–132 VAC, 3.0 A)
- POW-AD22GY (AC-DC 85–264 VAC, 2.0 A)
- POW-DD10GY (DC-DC 10–30 VDC, 3.0 A)
- Fan Unit: FAN-FIT (optional cooling fan, extends operating temperature to 60 °C)
- Cables and Connectors:
- CN5-D9F (female D-sub 9-pin connector set, CONTEC)
- 17JE-13090-02(D8C) (female connector, DDK)
- DELC-J9PAF-20L9 (male connector, JAE)
- Mounting Hardware: Standard 35 mm DIN rail clips integrated; no additional brackets required.

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6. Installation & Setup

- Mounting:
The module attaches directly to a 35 mm DIN rail using a one-touch mechanism. Installation and removal require only a flathead screwdriver.
- Stack Connection:
Modules interconnect laterally via the F&eIT bus connector with a safety lock mechanism, eliminating the need for backplanes.
- Device ID Setting:
Use the rotary switch on the front panel to assign a Device ID (0–F). The ID determines I/O address and interrupt configuration.
- Electrical Connection:
Two 9-pin D-sub male connectors (CH0, CH1) provide RS-232C interfaces. Locking screws (UNC #4-40) ensure secure attachment.
- Cable Selection:
Use straight cables for modem connections and cross cables for PC-to-PC or device-to-device communication. Maximum cable length: 15 m.
- Software Setup:
- Install the COM-DRV(W32) driver (for enhanced mode) or use standard OS drivers (for compatible mode).
- Configure I/O addresses and IRQs in the operating system’s device manager.
- Verify resource allocation to avoid conflicts.
- Environmental Requirements:
Operate within 0–50 °C, 10–90% RH (non-condensing). Avoid corrosive gases, excessive dust, or strong magnetic fields.

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7. Performance & Capabilities

- Data Throughput: Up to 921.6 kbps per channel (enhanced mode).
- Latency: Adjustable via FIFO trigger level; optimized for real-time industrial communication.
- Interrupt Handling: Shared or independent interrupt levels depending on mode; supports efficient multi-channel operation.
- Reliability: Hardware FIFO and watchdog-compatible design ensure stable operation under high-load conditions.
- Compatibility: Fully interoperable with F&eIT microcontrollers, I/O controllers, and media converters.
- Limitations:
- Cable length limited to 15 m (RS-232C standard).
- High-speed transmission may be affected by cable quality and environmental noise.
- Device IDs 8–B not recommended for Windows environments due to reserved address ranges.

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8. Standards & Compliance

- Electrical Standards: RS-232C (EIA/TIA-232) compliant
- EMC Compliance:
- FCC Part 15 Class A (industrial use)
- EN61000-4-4 Level 3 (electrical fast transient/burst immunity)
- IEC1000-4-2 Level 2/3 (ESD immunity)
- Safety: Designed for industrial control panels and embedded systems; conforms to CE marking requirements.
- Environmental: RoHS-compliant, lead-free construction.
- Grounding: D-type (former Class 3) industrial grounding standard.

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9. Additional Information

- Warranty:
One-year limited warranty from the date of purchase. Covers defects in materials and workmanship. Excludes damage from misuse, modification, or environmental factors.
- Support & Service:
- Technical support available via CONTEC’s global offices (Japan, USA, Europe, China, Korea, Taiwan).
- Free driver and firmware updates downloadable from [www.contec.com](http://www.contec.com).
- Return Merchandise Authorization (RMA) required for repairs or replacements.
- Maintenance:
- Periodically inspect ventilation slits and connectors for dust accumulation.
- Avoid mechanical shock or vibration during operation.
- Replace the unit if exposed to excessive heat or moisture.
- Software & Development Tools:
- COM-DRV(W32): Windows driver for enhanced mode operation.
- API-SBP(W32): Win32 API library for device module access.
- Linux Support: Recognized as standard COM ports; no special driver required.
- Sample programs and diagnostics utilities included on the setup CD-ROM.
- Disposal:
Dispose of the product in accordance with local electronic waste regulations. The enclosure is recyclable industrial plastic.

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Summary

The COM-2(FIT)GY is a robust, high-performance RS-232C communication module engineered for industrial automation and embedded control applications. Its dual-channel configuration, high-speed capability, and flexible operating modes make it ideal for expanding serial communication capacity in distributed Ethernet-based systems. With its compact DIN-rail form factor, stackable F&eIT bus interface, and comprehensive software support, the COM-2(FIT)GY provides a reliable and scalable solution for connecting legacy serial devices to modern networked control architectures.