Black Box LD485A Asynchronous Multipoint Line Driver

Overview
The Black Box LD485A Asynchronous Multipoint Line Driver is a high-performance interface solution designed to reliably transmit RS-232 data across long distances and multiple nodes. Engineered for industrial environments, this driver provides robust signal integrity, low power consumption and easy integration into existing communication networks.

Key Features

• Supports up to 32 multipoint stations on a single bus
• Maximum data rate 115.2 kbps with error-free transmission
• Integrated fail-safe biasing eliminates line idle errors
• Low power operation typical 5 mA at 5 V
• Wide operating temperature range -40 to 85 deg C
• Compact 16-pin DIP package for space-constrained designs
• Built-in over-voltage and short-circuit protection

Technical Specifications

• Supply voltage: 5 V 10%
• Input voltage range: -12 V to +12 V
• Output voltage swing: 10 V
• Propagation delay: max 150 ns
• Common mode rejection: > 80 dB
• Maximum cable length: 1200 m with standard twisted pair
• Connector type: screw-terminal or RJ45 compatible

Typical Applications

• Industrial automation and PLC networking
• Remote sensor and actuator control
• Building management systems
• Security and surveillance equipment
• Medical device communication
• Transportation and railway signalling

With its rugged construction and flexible configuration options, the LD485A delivers dependable asynchronous communication for demanding applications, helping engineers reduce system complexity while maintaining high data integrity.