USB to 4 channel isolated RS232 converter module based on FT4232HL. It provides fast, stable, and reliable communication with broad compatibility, making it easy to expand multiple RS232 industrial serial devices from a single USB interface. Key benefits Fast and reliable USB to RS232 communication through the FT4232HL chip, with strong compatibility across RS232 devices. Onboard isolation for both power and signal to reduce interference, improve reliability, and protect connected equipment. Flexible power input via onboard screw terminal from 5V to 36V DC, suitable for diverse industrial power sources. Robust protection features including surge suppression, ESD protection, and overcurrent/overvoltage protection to enhance system safety and longevity. Designed to support multiple RS232 channels from one USB connection, enabling scalable expansion of serial devices in a single setup. What it does Converts USB signals to four isolated RS232 channels, enabling reliable connections to multiple serial devices from a single computer or controller. Provides isolated voltage and isolated signal paths to minimize ground loops and electrical noise in industrial environments. Integrates protection components to guard against surges, spikes, lightning transients, and electrical faults. Key features and specifications Chip: FT432HL (FT4232HL) for speed USB to serial conversion. Interface: USB to 4ch isolated RS232 interface. Isolation: onboard unibody power supply isolation and onboard unibody digital isolation for signal isolation. Power input: onboard power supply screw terminal with 5V–36V DC widerange input. Protection: onboard Transient Voltage Suppressor for surge and transient spike suppression; lightningproof and ESD protection. Safety and reliability: onboard selfrecovery fuse and protection diodes for current/voltage stability and improved shock resistance. Compatibility: designed to work with standard RS232 interfaces via the FT4232HL platform, suitable for industrial serial devices. 2–3 practical use scenarios Industrial control cabinet expansion: Add four isolated RS232 channels to a PLC or programmable controller via USB, enabling connection to multiple sensors, meters, or actuators while maintaining electrical isolation and protecting the host computer. Lab instrumentation and testing: Connect diverse RS232 instruments (data loggers, oscilloscopes, analyzers) to a single PC or test bench PC, benefiting from fast USB communication and robust protection against surges and ESD. Data acquisition and monitoring: Deploy in a production line or research setup to gather serial data from several devices simultaneously, with isolation reducing noise and improving data integrity. Notes on usage The module uses the FT4232HL chipset to deliver speed USB to RS232 conversion with isolation features appropriate for industrial environments. The onboard screwterminal enables convenient DC power supply connection within a 5V to 36V range, allowing flexible integration with existing power supplies in equipment racks, cabinets, or benches. Builtin protection mechanisms help safeguard both the host system and connected peripherals against electrical disturbances and fault conditions. This description preserves the original product's brand, specifications, models, and functions while presenting the information in clear, customerfriendly language with concise bullets and practical use cases.