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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SainSmart 16-Channel 9-36V USB Relay Module

SainSmart 16-Channel 9-36V USB Relay Module

Product ID: 369174476

Details

Connector type
Usb
Contact material
Silver
Contact type
Normally Open
Current rating
10 Amps
Mounting type
PCB Mount

⚡Supports 9-36V DC power supply

💡10A/250V max load per relay

🔌16 SPDT relays for versatile control

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Elevate your smart projects with 16-channel power and precision control!

HIGH LOAD CAPACITY - Each relay handles up to 10A/250V, empowering you to switch heavy-duty appliances effortlessly.
WIDE VOLTAGE RANGE - Flexible 9-36V DC input adapts to diverse power setups, ensuring compatibility and reliability.
POWER YOUR AUTOMATION - Seamlessly control up to 16 devices with robust SPDT relays, perfect for smart homes and robotics.
USB CONTROLLED PRECISION - Plug-and-play USB interface with LED indicators for real-time status and easy integration.
OPTIMIZED FOR RELIABILITY - Opto-isolation and external power supply support minimize interference and maximize response speed.

The SainSmart 16-Channel USB Relay Module is a professional-grade, opto-isolated control board featuring 16 SPDT relays capable of switching loads up to 10A/250V. Designed for home automation, robotics, and industrial projects, it supports a wide 9-36V DC power range and offers USB connectivity with LED status indicators for intuitive operation and enhanced reliability.

Specifications

ASIN	B0793MZH2B
Best Sellers Rank	#100,399 in Computers ( See Top 100 in Computers ) #869 in Motherboards
Brand Name	sainsmart
Coil Voltage	36 Volts
Connector Type	Usb
Contact Current Rating	10 Amps
Contact Material	Silver
Contact Type	Normally Open
Current Rating	10 Amps
Customer Reviews	3.7 3.7 out of 5 stars (39)
Manufacturer	SainSmart
Maximum Switching Current	10 Amps
Maximum Switching Voltage	36 Volts
Minimum Switching Voltage	9 Volts
Mounting Type	PCB Mount
Operating Time	0.5 Seconds
Operation Mode	Automatic
Part Number	USB Relay Module
Wattage	90 watts

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