Milestone LD-112UDRMP RS232 to 12 Port RS485 Distributor : LD-112UDRMP

The Milestone LD-112UDRMP is a professional RS232 to RS485 serial data distributor designed for industrial and AV connectivity applications. It takes a single RS232 input and feeds it to twelve buffered, optically isolated RS485 outputs at the same time, letting one host computer or PLC communicate with many remote devices in both directions. Each output is protected individually against surges, so the unit stays reliable even in electrically noisy factory and plant environments. The rack-mount panel layout keeps multi-port wiring neat and centralised inside standard equipment racks.

Key Features

• 1-to-12 RS232 to RS422/RS485 Distribution Hub: Converts a single master RS232 input channel into twelve independent, optically isolated RS422 or RS485 output channels for large-scale industrial data distribution.

• 19-Inch Rack-Mount Chassis (RMP): Housed in a standardized rack-mountable (RMP) industrial metal enclosure designed for standard 19-inch server and equipment racks, ensuring clean integration into central control hubs.

• Selectable 2-Wire & 4-Wire Configurations: Supports both 2-wire half-duplex (RS485) and 4-wire full-duplex (RS422/RS485) modes across all 12 output ports via onboard DIP switches or jumpers.

• Optoelectronic Isolation & Transient Suppression: Provides high-voltage optical isolation and surge protection across all channels, protecting host equipment and connected field devices from ground loops, high electrical noise, and power surges.

• Automatic Data Direction Control: Features automatic baud-rate detection and hardware flow direction management, eliminating the need for software-driven RTS/CTS control lines.

• Comprehensive Diagnostic LED Panel: Equipped with front-panel LED indicators for Power, Master Transmit (TX), and individual Output Receive (RX1–RX12) lines to facilitate fast real-time status and traffic monitoring.

Applications
• Distributing commands from one PLC or PC to multiple automation devices
• Connecting several RS485 terminals to a single host in attendance and access control systems
• Broadcasting data to multiple barcode readers and remote terminals
• Fanning out control signals in SCADA and building management systems
• Expanding serial I/O for security and command-and-control installations
• Linking one serial master to many devices in industrial networking setups

Summary
The Milestone LD-112UDRMP is a dependable, isolated RS232 to RS485 distributor that lets a single host drive up to twelve RS485 devices simultaneously. With buffered outputs, surge protection and clear LED diagnostics, it is an ideal building block for integrators and industries that need stable multi-drop serial communication.