The unit is functioning as expected. However, after it's use more, the unit cause computer to crash, when turning the on/Off a few time, the program hang up on the write command. The computer needed to reboot to recover. Any idea about this issue ? There are posts on the web that shows the similar issues. Do you have …

i know this question is old, but other people might be having the same problem. I had the same problem after so much iteration of write. what i did was clear the cache. the memory can only hold so much write before it hangs. I clear the cache before every write. it worked for me

Do they provide a tool to control the board through command line?

You can download a sample tool from them which controls it via gui. I never saw a command line tool. It wasnt hard to integrate their commands into my own platform so a basic coder could probably make you a command line tool.

Can this be used to give nc / no contacts?

I'm not sure of your question. This card has eight relays. Each relay has three screw clamp terminals where one is normally open, one is normally closed and the last is the common. So you can wire your device(s) to any or all relays in either normally open or closed position as you like. I hope this clarifies things.

I want use as programmable sequential controller for my business led street sign, this unit need computer for program only or need computer to run.

You would need it connected to a computer. This unit does not have any sort of programmable timers or states. It is more or less a light switch you control via a computer button.

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SainSmart USB Eight Channel Relay Board for Automation - 12 V

SainSmart USB Eight Channel Relay Board for Automation - 12 V

Product ID: 3243676

Details

Connector Type
Solder
Contact Material
Copper
Contact Type
Spdt
Current Rating
10 Amps
Mounting Type
Panel Mount

⚡Supports up to 10A high current switching

🔌8 SPDT relays for versatile control

🛠️Extra PCB openings for superior voltage isolation

₨1119

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Description

⚡ Automate smarter, not harder — power your projects with precision!

POWER YOUR AUTOMATION LIKE A PRO - 8 independent SPDT relays let you control multiple devices seamlessly.
PLUG PLAY WITH SOFTWARE SUPPORT - Compatible with SainSmart’s intuitive software for effortless integration and control.
BUILT FOR HIGH PERFORMANCE DEMANDS - Handles up to 10 Amps current, perfect for robust industrial and home setups.
ENGINEERED FOR SAFETY RELIABILITY - Extra PCB openings ensure enhanced voltage isolation, minimizing risk and boosting durability.
DURABLE COPPER CONTACTS PANEL MOUNT - Premium copper contact material and secure panel mounting for long-lasting, stable operation.

The SainSmart USB Eight Channel Relay Board is a 12V automation powerhouse featuring 8 SPDT relays capable of switching up to 10 Amps. Designed with extra PCB openings for enhanced voltage isolation and doubled high current tracks, it ensures reliable, safe operation. Supported by dedicated software and built with durable copper contacts, this panel-mount relay board is ideal for professional-grade home and industrial automation projects.

Specifications

Asin	B0093Y89DE
Best Sellers Rank	#84,788 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #24 in Solid State Relays
Brand Name	SainSmart
Coil Voltage	12 Volts
Connector Type	Solder
Contact Material	Copper
Contact Type	Spdt
Current Rating	10 Amps
Customer Reviews	4.1 4.1 out of 5 stars (124) 4.1 out of 5 stars
Manufacturer	SainSmart
Maximum Switching Current	10 Amps
Maximum Switching Voltage	12 Volts
Minimum Switching Voltage	11 Volts
Model	8541582310
Mounting Type	Panel Mount
Operation Mode	Automatic
Part Number	11601
Unit Count	8.0 Count
Wattage	120 watts

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