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[Discontinued] RJ45 TCP/IP Remote Control Board with Integrated 8-Ch Relay
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Brand: SainSmart SKU: 101-70-141

[Discontinued] RJ45 TCP/IP Remote Control Board with Integrated 8-Ch Relay

SKU: 101-70-141 5 reviews Variants ID: 39258585432143
$39.99 $45.99
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  1. Ethernet TCP/IP RJ45 Port
  2. Onbaord WEB server allows accessing and controlling the relay via WEB
  3. 8-Channel 250V/AC 10A Relay control individually?
  4. Thicker tinning for relay’s wiring
  5. 8 external control outputs and active low level can control switch or sensor, etc.
  6. Wide operating voltage range: 7-24V DC power supply
  7. Provide protocol for reengineering:( When connected to router, it allows access control via Android, Mac, Tablet, Windows system from anywhere in the world with network)
  8. Supports status return, can display current status of the relays
  9. IP Port can be modified
  10. With Reset function, short press to reset, long press to restore factory setting.
  11. Supports 485 networking.
  12. Internal circuit protection: with optocoupler to prevent from external voltage surge


  • 1x Sainsmart remote Controller Board
  • 1x a case for protection
Customer Reviews
4.4 Based on 5 Reviews
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Works as expected with a few considerations

Works as expected, cheap no frills webrelay Notes If you run the board with higher than 6v the ethernet chip and power regualtor get really hot and board make high pitch noises. Stick with 6v! Does not have unique MAC address! 1 per network Cannot simultaneously close 2 relays, however it will queues up commands and do them when its ready VERY basic webGUI

Pall O.

Ecellent - but needs a manual

Howto: Connect a DC power supply 7 - 24 V to the circular power connector on the card, and an ethernet cable to a network (ip adresses on network: 192.168.1.x). Open a page (X as in review above) in a browser and you are connected to the card. To connect the 240 V AC to the relays, refer to a nice video: as a guide. Hope this helps ... :-)



Gibt es zu diesem Bauteil eine Bedienungsanleitung?


Good product but need workaround for multiple units.

I bought several units to control power supply to several devices across many buildings, using the same network. The problem I encountered is that ALL the units have the same MAC address. This is insane. The work around is to issue the arp -d command to clear the cache before making each webrequest. I used the units for several months now, without much problem. Occasionally need to power reset the unit as it hangs without any apparent reason, otherwise good product


Good product with some small issues to workaround

I bought this product and the other version (16 relay board) from SainSmart. This one is nicer because it has the plastic case and it can be mounted on a rail. The default IP address is indeed but to really access the commands and statuses you need to use So 30000 is NOT actually the port number but rather a relative virtual folder on the web server. To get the relay statuses from your code you need to perform a webrequest to (this will get you 4 relay statuses) and the other 4 relay statuses. However is NOT guarantee that /42 will receive first 4 relays (0 to 3) and /43 will get the last relays (4-7). Sometimes /42 will give you relay statuses 4-7 so make sure you parse the HTML correctly. Another annoying issue I had was regarding the fact that the device stopped working sometimes. No ping response, nothing. After restart it went well. I did a lot of testing to figure out there is a problem if you issue 2 requests at the same time for the board. In my case I had a ping opened to board and my tool reading relay statuses. After few reads the board stopped to respond to anything. Without ping opened it works flawlessly. Also if you issue 2 webrequests to board at the same time (for reading/setting relays) you will get into the same situation so make sure you use a global mutex somewhere to read/set the board relays. I did consecutive requests (so no simultaneous) and I managed to reach 50.000 successful requests in few minutes without any issue(I stopped my test after that because I consider it relevant). I almost forgot: To set relay states:[X] where [X] = 00 - relay 0 OFF 01 - relay 0 ON 02 - relay 1 OFF 03 - relay 1 ON 04 - relay 2 OFF 05 - relay 2 ON etc. I hope it will help you guys...