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DC 12V 2Ch RS232 Relay Board Remote Control USB PC UART COM Serial Ports
  • DC 12V 2Ch RS232 Relay Board Remote Control USB PC UART COM Serial Ports
  • DC 12V 2Ch RS232 Relay Board Remote Control USB PC UART COM Serial Ports
  • DC 12V 2Ch RS232 Relay Board Remote Control USB PC UART COM Serial Ports

DC 12V 2Ch RS232 Relay Board Remote Control USB PC UART COM Serial Ports

  • Model: TB351
  • Shipping Weight: 0.06Kg
  • 9999 Units in Stock

USD $9.99

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Package inlcuded:
1 x DC  12V 2Ch RS232 Relay Board:
2 Channel Relay Module;
Power input: DC 12V.
PC Serial ports RS232 Control Relay;
Power indicator: LED lights ;
Output indication: relay output with LED indicators, easy to see working status of the relay ;

Communication protocol: UART protocol communication, baud rate 9600kpbs, 8 data bits, one stop bit, no parity. Each data frame contains eight bytes. Two-way data transmission.
Baud rate 9600kbps, 8 data bitsone stop bit, no parity. Each data frame contains eight bytes..
PCB Size : 71x47mm
1 Control commands

1. Reading statusreading the satus of the relay (on/off)

0x55 0x56 0x00 0x00 0x00 0x00 0x00 0xAB


2. Relay open (issue this command ,Relay open , COM connect to NO )

Channel 1 :0x55 0x56 0x00 0x00 0x00 0x01 0x01 0xAD

Channel 2 :0x55 0x56 0x00 0x00 0x00 0x02 0x01 0xAE


3. Relay close (issue this command ,Relay close , COM disconnect NO and COM connect to NC )

Channel 1 :0x55 0x56 0x00 0x00 0x00 0x01 0x02 0xAE

Channel 2 :0x55 0x56 0x00 0x00 0x00 0x02 0x02 0xAF

4. Relay toggle(Relay status reversal,if COM connect to NO,this commands will Disconnect COM to NO and Reverse COM connect to NC,and vice versa

Channel 1 :0x55 0x56 0x00 0x00 0x00 0x01 0x03 0xAF

Channel 2 :0x55 0x56 0x00 0x00 0x00 0x02 0x03 0xB0


5. Relay momentary(Relay COM connect to NO,disconnect after 200MS )

Channel 1 :0x55 0x56 0x00 0x00 0x00 0x01 0x04 0xB0

Channel 2 :0x55 0x56 0x00 0x00 0x00 0x02 0x04 0xB1

Once issue a command, will have a return fame , 7th byte of return fame mean the satus of realy .

2 return command

1、Return relay open(return this command,mean COM connect to NO )

Channel 1 : 0x33 0x3C 0x00 0x00 0x00 0x01 0x01 0x71

Channel 2 : 0x33 0x3C 0x00 0x00 0x00 0x02 0x01 0x72


2、Return relay close(return this command,mean COM disconnect NO and COM connect to NC )

Channel 1 : 0x33 0x3C 0x00 0x00 0x00 0x01 0x00x72

Channel 2 : 0x33 0x3C 0x00 0x00 0x00 0x02 0x00x73

Instruction manual Please ask us after the purchase
Remote control, remote measurement system; 
Wireless meter;
Smart Home,Home Automation ,Wiser Home;
Access control ;
Identification system;
Data collection; 
IT household appliance;
Intelligence household appliance;
Baby monitoring system;
Typial application :
1 DC 12V control circuit,Wiring diagram below. "LOAD" may be LED lights, fans, motors and other DC 12V equipment
2 DC 1-48V OR AC 85-265V control circuit,Wiring diagram below(Note:If not DC 12V load, need another DC 12V power supply). "LOAD" may be LED lights, fans, motors and other DC AC equipment
Test Software:(Only support win xp (32/62) win 7 (32/62) Operating System)
Test Software:(Only support win xp (32/62) win 7 (32/62) Operating System)
Introduction for Shenzhen Canton-electronics Trading Co.,Ltd :
We specialize in RF Wireless Radio Transmitting Units and Receiving Units, the product include transmitters with case, receivers with relay(s), transmittng modules and receiving modules, are widely applied in RC toy, remote sensing, telemetry, fireworks, industrial control, home&garden application.
Normally shipping is by Airmail from China Post Air Mail or Hong Kong Post Air Mail ,15-60 days shipping time based on different country .
Express is available, shipping time is 2-7 days all over the world, and telephone number is needed. Please contact us first for extra payment .
The Best Prices. By working with Canton-electronics Ltd, you can take advantage of the internet business, cut off the wholesalers cost and other costs, and import your products directly from the manufacturer at incredible prices.
Prompt Delivery. Most units are in stock all the time, standard units will be completed within 1-3 days if they are sold out, it is great help for you if your project must be completed before deadline.
Prompt Service. Mails will be replied within 24 hours We work 6 days a week.
Return Policy
All mails will be replied to within 24 hours except on weekend and holidays.
Every item is manufactured under Strict Quality-Assurance Guidelines. If you are dissatisfied for any reason, please return the product to us, and we'll refund your money(not including shipping fees).
Please ensure that return items are not used.
Return items must be Posted within 7 days of receipt.
Please inform us via email before posting your return package.
We accept PayPal only.
We only ship item to your PayPal verified address.
Payment must be received within 3 Days from the date of purchase.
Please leave note in PayPal when making the payment if you have any special request (colors/size).
Orders will be processed instantly and dispatched in same day normally, so we do NOT accept any Email/Message note before or after you place orders.
Import tax :
We will dispatch the item as SAMPLE or GIFT , label the total amount on the custom declare invoice .
Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to buying.


Online Security
All transactions are secured. The website is provided with an SSL encryption system to protect personal and payment data. We do not sell or ship any items ordered through the Site directly to anyone we know to be under the age of 18. We will not collect and personally identifiable information (e.g. name, address, telephone number and e-mail address), also referred to herein as "personal information", about you unless you provide it to us voluntarily.

Items can be returned for a refund or exchange within 60 days of the date of purchase. But the reason for returns caused by yourself (eg, size, color you choose), cannot be accepted. Special circumstances may require partnership with corporate business partners. For more information, please contact our customer service. We shall ship the items via DHL or USPS Once your order is processed you will receive email notification with shipment tracking number. All delivery standards begin when you receive this email. If order is placed after 3:00 PM CST on Friday or on the weekend, the earliest it will ship is Monday.