RM4U USB Controlled Relay Module 4-Channel

From the shop's description

RM4U USB Controlled Relay Module 4-Channel RM4U is a 4-channel USB-controlled relay module. It can be used to control electrical devices remotely from a PC over a USB port such as lamps, motors, and locks. RM4U features a wide operating voltage range (9-40V) and supports serial communication baud rate speeds starting from 2400 up to 115200 bps. RM4U module is well protected, filtered, and fully isolated. Features Supports Windows XP, 7, 10, and 11. Supports 4 relay outputs. Wide operating voltage range: 9~40 DCV. Control: Serial communication. Driver: CH340. Supported baud rates: 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, and 115200. Interface: USB type B connector. Simple control protocol: Just two-character commands. All outputs are optically isolated. Both normally open and normally close relay contacts are available. Reverse polarity protection. On-board DC power filter. Power LED indicator. Serial communication LED status. LED indicator for each relay. Mounting: Four (Ø 3.5mm) mounting holes for easy installation. Dimensions: 144 X 55 X 21mm. PINOUT Specifications Parameter Value Model RM4U Channels 4 Operating Voltage 9~40VDC Control Interface USB (CH340 USB-to-UART) Supported Baud Rates (bps ) 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, 115200 Command Protocol Simple two-character serial commands Output Type Opto-isolated SPDT relays (NO/NC) Indicators Power LED, Serial activity LED, 4× Relay LEDs Connector USB Type-B (control); screw terminals for relay/load wiring Mounting 4× Ø3.5mm mounting holes Dimensions 144mm x 55mm x 21mm Applications PC-based automation and test rigs for switching lamps, motors, solenoids and small actuators. Home and building control systems requiring isolated relay outputs driven from a computer. Remote switching for lab equipment, bench setups, and field prototypes. Integration with microcontroller systems via serial bridge for logging, timed switching or sequencing. Replacement or upgrade in control panels where USB control and optical isolation are required. Package Contents 1x RM4U USB Controlled Relay Module 4-Channel. Documents Manual RM4U