NI PCMCIA-485 RS485 1-Port Interface

The NI PCMCIA-485 is a single-port RS-485 interface card that connects to PCMCIA Type II slots in laptops and portable systems. It enables industrial serial communication over extended distances with support for multi-drop network topologies—up to 32 devices on a single line. The card operates at data rates up to 921.6 kbps and accommodates cable runs to 4000 feet, making it suitable for distributed measurement and control systems where standard USB or Ethernet connectivity is unavailable.

– Technical Specifications

• Interface: PCMCIA Type II
• Protocols: RS-485, RS-422
• Ports: 1 (DB-9 male via adapter cable)
• Data Rate: Up to 921.6 kbps (10 Mbytes/s bus throughput)
• Maximum Cable Length: 4000 feet
• Device Capacity: Up to 32 devices per RS-485 line
• UART: 16550-compatible, 16-byte buffered with adjustable FIFO
• Transceiver Control: Four modes supported; four-wire factory default
• Communication Modes: Simplex, half-duplex, and full-duplex across 2- and 4-wire configurations
• Hardware Handshake: RTS/CTS lines available
• Power: 100 mA typical (110 mA typical, 225 mA maximum) at +5 VDC from PCMCIA slot
• Operating Temperature: 0°C to 70°C
• Storage Temperature: −40°C to 120°C
• Humidity: 10–90% RH operating, 5–90% RH storage (non-condensing)
• Dimensions: 3.370 × 2.126 × 0.197 inches

– Key Features

• Requires no external power supply
• Supports flexible 2- and 4-wire RS-485 topologies
• 16550 UART with configurable buffering for reliable data handling

– Typical Applications

Industrial automation, data acquisition systems, and remote device control where multi-point serial networks are required over long cable runs.

– Compatibility & Integration

Operating systems: Windows NT, Windows XP, Windows 2000, Windows Me, Windows 9x. Software development via LabVIEW, Measurement Studio, and LabWindows/CVI. Requires NI-Serial driver software and integrates with NI-VISA.