RS232 to 4 RS422/RS485 Convertor Distributor : LD-104UDP

The Milestone LD-104UDP is a multi-channel serial converter and distributor that takes a single RS232 input and distributes it to four RS422/RS485 output ports. Designed for industrial control and building automation installations, it allows one master controller to communicate reliably with multiple slave devices over extended cable lengths. The unit supports standard RS422 and RS485 wiring configurations, making it suitable for access control, CCTV pan-tilt-zoom control, intercom, and process monitoring systems. Its rugged metal housing is built for continuous operation in equipment racks and control panels, and the straightforward screw-terminal interface speeds up installation for integrators and system engineers. With stable performance and long-distance signal capability, the LD-104UDP is a dependable building block for serial communication networks.

Key Features

• 1-to-4 RS232 to RS422/RS485 Distribution: Converts a single master RS232 serial input port into four independent, isolated RS422 or RS485 output channels for multi-device network expansion.

• Selectable 2-Wire & 4-Wire Modes: Supports both 2-wire half-duplex (RS485) and 4-wire full-duplex (RS422/RS485) serial operating modes across all output ports via onboard dip switches/jumpers.

• Optoelectronic Isolation & Protection: Built-in high-voltage optical isolation safeguards host controllers and connected field devices from electrical noise, transient power surges, and ground loops.

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

• Front-Panel Visual Status Indicators: Integrated LED indicators for Power, Master Transmit (TX), and individual Output Receive (RX1–RX4) lines enable quick real-time diagnostics and signal monitoring.

• Industrial Housing & Design: Housed in a heavy-duty, industrial-grade metal enclosure engineered for 24/7 continuous operation in factory control panels, SCADA networks, and automation environments.

Applications
• Access control and security systems
• CCTV pan-tilt-zoom and matrix control
• Building management and automation systems
• Industrial process control and monitoring
• Intercom and public address networks

Summary
The Milestone LD-104UDP serial converter distributor provides a reliable, cost-effective way to expand a single RS232 control signal to four RS422/RS485 devices. Its robust design and simple installation make it a practical choice for integrators building dependable communication networks.