Serial port control relay module/board microcontroller, computer USB control switch, point-to-point self-locking

Product Parameters

Adopting high-performance microcontroller chips

Adopting CH340 USB control chip

Adopting a 1-channel 5V, 10A/250VAC, 10A, 30VDC relay, the relay has a lifespan of 100000 continuous pull in cycles

Onboard power LED indicator and relay status LED indicator.

The module has overcurrent protection and relay diode freewheeling protection functions.

Product Description

HW-667 USB serial port control relay module is a stable USB to serial port chip and microcontroller chip. It can be used on the computer to send serial port commands using serial port debugging software to control the on/off of one relay

Product Functions

Relay switch output description:

COM1: Public end:

NC: Normally closed end, the relay is short circuited to COM before closing, and suspended after closing;

NO: At the beginning, the relay is suspended before closing and short circuited to COM after closing.

Communication protocol description:

1. The default communication baud rate for USB switches is 9600BPS

Control relay often starts to close: A0 01 01 A2

Control the normally closed end of the relay to close: A0 01 00 A1

2. USB switch communication protocol

Data 1- Initial identifier (default is 0xA0)

Data 2- Switch Address Code (0x01 and 0x02 represent the first and second switches, respectively)

Data 3- Operation Data (0x00 is "off", 0x01 is "on")

Data 4- Verification Code

Instructions for use:

1. Connect the H-667 module to the computer and install the driver for the CH340 USB to serial chip.

2. Open STC-ISP or sscom serial port debugging software, select baud rate of 9600, and use hexadecimal (hex)

The form of sending A0 01 01 A2 can control the normally closed end of the relay to open and the normally open end to close; In hexadecimal (hex)

The form of sending 40 01 00 A1 can control the relay to open at the normally open end and close at the normally closed end. You can choose to send manually or automatically. Here is an example of the SSCOM 5.13.1 serial port debugging software:

Product Size

Product Show

Payment&Transportation

Official Certificate&Certificate

Multiple product supply

Company office environment

Warehouse Real Shot

Standard packaging

We also provide ：