HW667 Serial Port Control Relay Module/Board MCU Computer USB Control Switch PL Jog selfLocking The HW667 is a compact relay control module that integrates an onboard microcontroller (MCU) and provides both serial port and USB control. It is designed as a versatile control switch with a PL Jog selflocking feature, enabling reliable, programmable switching of external circuits from a PC, microcontroller, or automated test setup. Key benefits Flexible control options: Operate the relays via serial port or USB, allowing straightforward integration with computers, microcontrollers, and automation systems. Onboard intelligence: An MCU on the board handles control logic, enabling responsive, deterministic switching and easy integration into custom projects. Selflocking PL Jog control: The PL Jog selflocking mechanism provides a stable, latched state for manual or automatic control sequences, helping prevent accidental changes during operation. Simplified integration: Combines switching capability and control interface in a single module, reducing wiring and assembly effort in automation or prototyping environments. Reliable operation: Built as a compact, purposebuilt control relay module suitable for a variety of PC and embedded applications. Key attributes Model: HW667 Type: Serial Port Control Relay Module/Board with MCU Interfaces: USB and serial port for external control and data communication Control feature: PL Jog selflocking mechanism for stable relay states Construction: Compact relay control board designed for easy integration into projects and systems Functionality: Enables switching of external circuits via computer or MCU control Performance: Designed for reliable, repeatable relay actuation under programmatic control Compatibility and integration Works with standard USB and serial communication workflows to connect with PCs, singleboard computers, and microcontroller projects. Suitable for use in automation tasks, testing rigs, and embedded development where external circuit switching is required. Two to three use cases PCbased automation or test bench: Use USB or serial control to switch external devices, instruments, or power supplies from software running on a computer or a development workstation. Microcontrollerdriven control: Integrate with an MCU project to remotely drive relays in response to sensor data or state machines, enabling automated processes or prototyping of control systems. Prototyping with stable state switching: Leverage the PL Jog selflocking feature to maintain a chosen relay state during debugging or between control cycles, reducing the risk of unintended changes during operation. What makes it unique The HW667 combines serial port control, USB connectivity, and onboard MCUdriven logic in a single relay module, delivering a compact, turnkey solution for applications requiring both flexible interfaces and reliable switch control. The inclusion of a PL Jog selflocking mechanism provides a practical method to maintain a latched relay state, enhancing stability in automated or manual control scenarios. Its design emphasizes simple integration, enabling developers and technicians to deploy a dependable control switch with minimal wiring and configuration. Notes on use and setup Connect the HW667 to a PC or MCU via USB or serial interface and issue the appropriate control commands or data packets as defined by the device protocol. Utilize the PL Jog selflocking input to establish or maintain a latched relay state as part of your control logic. Integrate the module into automation, testing, or prototyping workflows where reliable, programmable switching of external circuits is required. This description reflects the brand, model, and features implied by the product title HW667 Serial Port Control Relay Module/Board MCU Computer USB Control Switch PL Jog selfLocking, and presents clear, customerfriendly information without adding extraneous or unverified details.