🔌 Professional 4-Port RS422/RS485 Serial Expansion Card
Expand your embedded PC or industrial system with four high-performance RS422/RS485 serial ports. Built on the reliable EXAR 17V354 chipset for mission-critical applications.
📥 Driver Download: EXAR 352/354/358 Driver Package →
✨ Key Features
- 🔢 4 Independent Serial Ports: RS422/RS485 with automatic direction control
- ⚡ High-Speed Performance: Up to 921.6Kbps transmission rate
- 📡 Long-Distance Communication: Up to 1.2km range
- 🛡️ Industrial-Grade Protection: 600W surge + 15kV ESD protection
- 🔗 Flexible Connectivity: Point-to-point or point-to-multipoint (up to 32 devices)
- 📐 Compact Design: Full-Mini (F1) form factor - 50 x 30mm
- 🌡️ Extended Temperature Range: -40°C to 85°C
- 🔄 Automatic Flow Control: Hardware, XON/XOFF, or none
📋 Technical Specifications
| Model | IO-MPCE354A-4S |
| Chipset | EXAR 17V354 |
| Interface | Mini PCIe |
| Serial Ports | 4 x RS422/RS485 |
| Baud Rate | Up to 921.6Kbps |
| Transmission Distance | Up to 1.2km |
| Protection | 600W surge, 15kV ESD |
| Operating Temperature | -40°C to 85°C |
| Product Size | 50 x 30mm |
🏭 Applications
- Factory Automation and Process Control
- Industrial Data Acquisition Systems
- Point-of-Sale (POS) Systems
- Remote Access Servers
- Storage Network Management
- Building Automation Systems
💻 System Compatibility
Windows: XP, 7, 8, 10, 11, Server 2003-2019
Linux: Kernel 2.6.27 and newer
⚠️ Requirement: One available Mini PCI Express slot required
❓ Frequently Asked Questions
🔧 What is the difference between RS422 and RS485?
RS422: Full-duplex communication, point-to-point or point-to-multipoint (1 transmitter to up to 10 receivers). Uses 4 wires.
RS485: Half-duplex or full-duplex, supports multi-point networks (up to 32 devices). Uses 2 or 4 wires. This card supports both modes automatically.
💻 Is this card compatible with my motherboard?
This card requires a Mini PCIe slot. Compatible with industrial PCs, embedded computers, thin clients, and some laptops. NOT compatible with standard PCIe, M.2, or mSATA slots.
📥 Do I need to install drivers?
Yes. Driver installation is required. The EXAR driver package is included and available for download above. Supports Windows XP/7/8/10/11, Windows Server, and Linux.
📏 What is the maximum cable length?
Up to 1.2km (4,000 feet) using twisted-pair or shielded cable. Actual distance depends on baud rate and cable quality.
🔌 How many devices can I connect?
Each port supports up to 32 RS422/RS485 devices in multi-point configuration with automatic direction control.
🛡️ What protection does this card offer?
600W surge protection and 15kV ESD protection on all ports. Suitable for harsh industrial environments.
🌡️ Can this work in extreme temperatures?
Yes. Rated for -40°C to 85°C. Ideal for outdoor installations, factory floors, and harsh environments.
⚙️ Do I need to configure direction control?
No. Features automatic data-flow direction detection. The EXAR chipset manages transmit/receive switching automatically.
🔄 Can I use all 4 ports simultaneously?
Yes. All 4 ports are independent and operate simultaneously at full speed (921.6Kbps each).
📦 What is included?
Package includes: (1) Mini PCIe Serial Card, (1) User Manual. Cables NOT included.
📦 Package Contents
- ✅ 1 x Mini PCIe 4-Port RS422/RS485 Serial Card
- ✅ User Manual