Comprehensive Product Summary – SUNIX IPC‑E2004SI PCI Express 4‑Port RS‑422/485 Isolated Serial Card

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### 1. Product Overview

Product Name: PCIe 4×RS‑422/485 Isolated Professional Card
Model: IPC‑E2004SI
Series: SUNIX Industrial Multi‑Port Serial Communication Boards – PCI Express Series
Article Number: IPC‑E2004SI
Manufacturer: SUNIX Co., Ltd.

The SUNIX IPC‑E2004SI is a professional‑grade, four‑port RS‑422/485 serial communication card designed for industrial and embedded applications requiring high reliability, electrical isolation, and surge protection. It connects via a single‑lane PCI Express interface and provides four independent, optically isolated serial channels supporting both RS‑422 full‑duplex and RS‑485 half‑duplex modes. The card integrates SUNIX’s proprietary AHDC/CS™ automatic hardware direction control and RS‑422/485 auto‑detection technology, ensuring seamless operation without manual jumper configuration.

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### 2. Key Features

- Four Independent Serial Ports: Supports four isolated RS‑422/485 channels via a DB‑44 female connector and breakout cable.
- PCI Express Interface: Compliant with PCI Express Bus Specification Revision 1.0a; operates on a single PCIe lane for high throughput and low latency.
- High‑Speed Communication: Supports baud rates from 75 bps up to 921.6 kbps per port.
- Optical Isolation: 2.5 kV isolation protection for all signal and power lines, preventing ground loops and protecting connected devices in electrically noisy environments.
- Surge Protection: 600 W peak surge suppression per IEC 61000‑4‑5 standard, safeguarding against transient voltage spikes.
- ESD Protection: Embedded 15 kV electrostatic discharge protection on all signal lines.
- Automatic RS‑422/485 Detection and Switching: SUNIX Auto Detect and Switching technology automatically configures each port for RS‑422 or RS‑485 operation without jumpers or DIP switches.
- AHDC/CS™ Technology: Proprietary Auto Hardware Direction Control/Carrier Sense system for precise RS‑485 signal direction management, minimizing bus collisions and ensuring reliable half‑duplex communication.
- 64‑Byte FIFO Buffer: Hardware FIFO per port, fully compatible with 16C750 UART architecture, ensuring smooth data flow and reduced CPU overhead.
- Software Flow Control: Supports XON/XOFF software flow control.
- Unlimited Scalability: Multiple cards can be installed in a single system, limited only by available PCIe slots.
- Dual Bracket Design: Includes both standard (121 mm) and low‑profile (79.2 mm) brackets for flexible installation in various chassis types.
- Wide Environmental Range: Operating temperature 0 °C – 70 °C; storage temperature −40 °C – 85 °C; humidity 5 % – 95 % RH.
- Comprehensive OS Support: Compatible with Windows 2000/XP/2003/Vista (32/64‑bit), DOS, Linux 2.4/2.6, and SCO OpenServer 5.06/5.07.
- Regulatory Compliance: CE and FCC Class B certified.
- Long‑Term Reliability: Backed by a 5‑year manufacturer warranty.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Interface Type | PCI Express Bus Specification Revision 1.0a |
| Bus Configuration | 1‑Lane PCI Express |
| Number of Ports | 4 independent RS‑422/485 ports |
| Connector Type | DB‑44 female on card; breakout cable to DB‑9 or DB‑25 male connectors |
| UART Controller | 16C750 compatible, SUNIX Matrix single‑chip ASIC |
| FIFO Buffer | 64 bytes hardware FIFO per port |
| Baud Rate | 75 bps – 921.6 kbps |
| Data Bits | 5, 6, 7, 8 |
| Stop Bits | 1, 1.5, 2 |
| Parity Options | None, Even, Odd, Space, Mark |
| Flow Control | XON/XOFF (software) |
| RS‑485 Direction Control | SUNIX AHDC/CS™ automatic hardware direction control |
| RS‑422/485 Selection | Auto Detect and Switch (no jumper required) |
| Isolation Protection | 2.5 kV optical isolation for all signal and power lines |
| Surge Protection | 600 W peak per IEC 61000‑4‑5 |
| ESD Protection | 15 kV embedded protection |
| Signal Pinouts | RS‑422: TxD+, TxD−, RxD+, RxD−, GND