Part number:1 Plug profile:PCB Mount Instructions:1.Description of Communication Protocol:1.1.Serial port baud rate: 9600BPS1.2.The switch and status query commands are as follows (HEX format):1.3.Turn on the first USB switch: A0 01 01 A21.4.Turn off the first USB switch: A0 01 00 A11.5.Turn on the second USB switch: A0 02 01 A31.6.Turn off the second USB switch: A0 02 00 A21.7.Turn on the third USB switch: A0 03 01 A41.8.Turn off the third USB switch: A0 03 00 A31.9.Turn on the fourth USB switch: A0 04 01 A51.10.Turn off the fourth USB switch: A0 04 00 A41.11.Query switch status: FF2.Instructions for use:2.1.Select the power supply method;2.2.USB power supply: USB connected to the computer, turn the toggle switch to the Usb-P end;2.3.External power supply: USB connected to the computer, turn the toggle switch to the Ext-P terminal, and the DC socket is connected to an external 5V power supply. Specifications:Model: LCUS-4-BWork voltage: DC 5VWork Temperature: -25~85Work Humidity: 5%~95%RHPower supply voltage: 5V, support USB power supply/external power supply switchingOutput type: Relay switch signalSize: 56mm*63mmPackage List:1 X USB Relay model About this item LCUS-4 USB Relay model is equipped with a USB-to-serial chip and microcontroller with stable performance. It can use serial debugging software on the computer to send serial commands to control the opening and closing of the four-way relays. Onboard 8-bit high-performance microcontroller chip. Onboard CH340USB to serial port control chip. The module has overcurrent protection and relay diode freewheeling protection functions. Onboard power LED indicator and relay status LED indicator. Support relay switch status query, query command: 0xFF. On-board 4-way 5V, 10A/250VAC, 10A/30VDC relay, the relay has a long service life and can be continuously pulled in 100,000 times. SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied. LCUS-4 USB Relay model is equipped with a USB-to-serial chip and microcontroller with stable performance. It can use serial debugging software on the computer to send serial commands to control the opening and closing of the four-way relays. Onboard 8-bit high-performance microcontroller chip. Onboard CH340USB to serial port control chip. The module has overcurrent protection and relay diode freewheeling protection functions. Onboard power LED indicator and relay status LED indicator. Support relay switch status query, query command: 0xFF. On-board 4-way 5V, 10A/250VAC, 10A/30VDC relay, the relay has a long service life and can be continuously pulled in 100,000 times. SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied.