UC300ETH Ethernet Motion Controller for Mach3, Mach4, and UCCNC, 6-Axis, 5 LPT Ports, Up to 400kHz

The UC300ETH-5LPT is a high-performance, industrial-grade motion controller designed to replace outdated parallel port (LPT) connections with a high-speed, stable Ethernet interface. By offloading motion buffering and step-generation from the PC to dedicated hardware, the UC300ETH eliminates the "jitter" and timing errors common in software-based pulsing, providing a significantly smoother and more reliable CNC experience for both stepper and servo-based systems.

High-Speed Performance & Software Compatibility
Engineered for precision and speed, the UC300ETH supports up to 6-axis control with a maximum step frequency of 400kHz per axis. This high-frequency output allows for much higher microstepping resolutions and faster traverse speeds than basic 100kHz controllers. The unit is fully compatible with industry-standard control software, including Mach3, Mach4, and UCCNC, and communicates via standard network packets. This driverless Ethernet communication ensures that your CNC table is not tethered to a specific PC's internal hardware limitations or outdated parallel port cards.

Massive I/O Capacity & LPT Compatibility
What sets the UC300ETH-5LPT apart from basic motion adapters is its expansive Input/Output (I/O) capability. The controller features five IDC26 ports, providing a total of 49 digital inputs and 36 digital outputs. To simplify integration, the board utilizes an LPT-compatible pinout on its digital ports, making it a "drop-in" logic upgrade for existing breakout boards and wiring layouts.

Ports #2 and #3: These follow the standard LPT pinout for immediate compatibility with most common breakout boards.

Ports #1, #4, and #5: These are configured as bidirectional-style ports, optimized to provide additional input capability for complex machines requiring multiple limit switches, probes, and operator console signals.

Analog Interface: In addition to digital I/O, the board includes 2 analog inputs and 2 analog outputs, which are essential for functions like spindle speed control (VFD) and feed rate overrides.

Network Integration & Power Requirements
The UC300ETH is designed for flexible network deployment. It can connect directly to a dedicated PC network card via a standard crossover or straight-through Ethernet cable, or it can be integrated into a local network through a router or switch. Because power is not carried over the Ethernet cable (Non-PoE), the manual specifies that the unit requires a stable, external 5VDC power supply. This isolation between the communication line and the power source further protects the controller from electrical noise and ground loops, ensuring signal integrity in demanding shop environments.

Technical Specifications Summary
The controller supports 6 axes of motion (X, Y, Z, A, B, C) and operates on a high-speed 32-bit internal buffer to prevent "buffer under-run" during complex 3D carving. Its physical design is compact and optimized for control cabinet mounting, featuring a rugged RJ45 Ethernet jack and five shrouded 26-pin headers. Compatible with all modern Windows operating systems, it provides a future-proof control foundation for CNC routers, mills, plasma cutters, and laser systems that have outgrown the limitations of a standard PC parallel port.

Why Upgrade to the UC300ETH?
Modern CNC software requires real-time, microsecond-level timing that standard PCs struggle to maintain while running background tasks. The UC300ETH solves this by acting as the "brain" of the machine, taking high-level commands from your PC and turning them into perfect, high-frequency pulses. With its massive 85-point digital I/O count and 400kHz speed, it provides the professional-level stability and expandability needed for high-production CNC environments.