RS485/USB-B Serial Converter Module

The RS485/USB-B Serial Converter Module is an industrial-grade USB-to-RS485 interface designed to provide reliable serial communication between a host computer and RS485-compatible devices. Built around the CH340B USB-to-UART bridge and MAX487 RS485 transceiver, the module offers a compact and reliable solution for industrial automation, embedded systems, instrumentation, and other industrial communication applications. Designed for dependable operation in demanding environments, the module incorporates industrial-grade protection circuitry and an optimized PCB layout to improve reliability and noise immunity. A USB Type-B connector enables convenient plug-and-play operation, while onboard Power, TX, and RX LEDs provide communication status indication. Field connections are made through a four-position screw terminal exposing 5 V, GND, RS485 A, and RS485 B signals. Features: CH340B USB-to-UART Bridge. MAX487 Half-Duplex RS485 Transceiver: Compliant with TIA/EIA-485 Standard. Maximum Data Rate: 250 kbps. Multi-Drop Bus network topology. Supports up to 128 nodes. USB Type-B Female Connector: USB Powered (5V). UART Baud Rate up to 2 Mbps (Limited to 250 Kbps by MAX487). On-board 120 Ω bus termination resistor. Supports Windows 7, 8, 10, and 11 (32-bit & 64-bit). Industrial Protection Circuitry. Resettable PTC Fuse. Ferrite Bead for EMI/ESD Suppression. Reverse-Polarity Protection. Optimized PCB Grounding for Improved Noise Immunity. Isolated USB Shield Ground Connection. Onboard Status LEDs: GREEN: Power Indicator. YELLOW: TX and RX Activity Indicator. Four-Pin Screw Terminal (5V, 0V, A, B). Compact, Plug-and-Play Design. Dimensions: 45.7 X 20.8mm.