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

Product ID: 71083111

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

💻USB interface for seamless PC integration

🔌16 SPDT relays for versatile control

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€ 69.43

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Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Command Your Smart Space with 16 Channels of Power!

ROBUST RELIABLE - Opto-isolated design protects your system from electrical noise
PLUG PLAY CONTROL - USB connectivity ensures easy setup and management
POWER YOUR AUTOMATION - Handles up to 10A/250V for heavy-duty devices
EXPAND YOUR SMART HOME - Perfect for robotics, home lighting, motors, and solenoid projects
VISUAL STATUS INDICATORS - Individual LEDs for each relay output keep you informed at a glance

The SainSmart 16-Channel USB Relay Module is a high-performance, opto-isolated control board featuring 16 SPDT relays capable of switching up to 10A at 250V. Powered by a flexible 9-36V DC supply and controlled via USB, it’s ideal for advanced home automation, robotics, and electrical device management with real-time LED status indicators for each relay.

Specifications

ASIN	B0793MZH2B
Best Sellers Rank	#227,012 in Automotive ( See Top 100 in Automotive ) #78 in Automotive Replacement Relay Control Module Relays
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	3.6 3.6 out of 5 stars (42)
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	Electrical
Part Number	USB Relay Module
Wattage	90 watts

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