Where can I download the software for this board ?

Hi, you can download from this link: http://s3.amazonaws.com/s3.image.smart/download/101-70-208/101-70-208.zip

is the ground pin of each channel connected together or each channel is totally isolated?

Hi, the ground of the control terminals is connected together, and each channel at the input is completely isolated.

Why do the commands not work when input into a serial terminal connected to the com port assigned? using putty 9600bps 8n1 i have added \r\n

Not sure what you entered there and if you have a proper serial port through the USB interface. Note there are many bytes to fransfer including a checksum if I remember correctly. (Did create some Python code which uses python usb)

Is it possible to expand this module to control more than 16 channels? If no, any other alternatives plz?

You can use a RPI with for example 4 modules, but It's better using 8-Channel USB because it contains serial number, so you have the possibility to identifiy witch module you use. It isn't possible with 2 module 16 channels on a RPI.

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🔧 Unleash Your Inner Innovator with SainSmart!

IDEAL FOR AUTOMATION - Perfect for home automation and robotics projects, making your life smarter.
USER FRIENDLY DESIGN - Simple ON/OFF switching for effortless control of lights, motors, and more.
EMPOWER YOUR PROJECTS - Transform your ideas into reality with 16 opto-isolated relays.
VERSATILE VOLTAGE RANGE - Compatible with devices operating between 9-36V for maximum flexibility.
SEAMLESS USB INTEGRATION - Easily connect and control your devices via USB for hassle-free operation.

The SainSmart 16-Channel USB Relay Module is a powerful opto-isolated board featuring 16 SPDT relays, designed for easy control of various electrical devices. With a voltage range of 9-36V, it’s perfect for home automation and robotics projects, allowing users to effortlessly switch devices on and off via USB.