welcome to Canton-Electronics Store
4CH 12V Modbus RTU PC UART RS485 Relay Board for PLC Lamp LED PTZ Camera Control

4CH 12V Modbus RTU PC UART RS485 Relay Board for PLC Lamp LED PTZ Camera Control

  • Model: CE040
  • Shipping Weight: 0.06Kg
  • 9992 Units in Stock

USD $11.99

  • Product Description
  • Shop Confidence
  • Shipping & Return
  • Customer Reviews
Typical applications:
Automated industry PLC
Smart Home,Home Automation ,Wiser Home;
Identification system;
PTZ Camera Control
Motor FW & BW
1 AT command mode (A5 = OFF), in this mode can be through the serial HyperTerminal (serial assistant) enter a simple AT command control relay. AT command mode time up to 9999 seconds

2 MODBUS command mode (A5 = ON), you can control a variety of ways: Serial Hyper Terminal Control (need to manually add the CRC), Modbus Poll software control (software automatically add the CRC), PLC or MCU process control

Test Software(We offer a demo video):
Serial HyperTerminal:
Modbus Poll


Product Name:4CH 12V Modbus RTU PC UART RS485 Relay Board for PLC Lamp LED PTZ Camera Control
Module No.: CE035
Package inlcuded:
1 x DC 12V 4Ch RS485 Modbus AT command Relay Board
1: DC 12V power supply (voltage range 9-13V )
2: Standby current (all relays closed) 11-13MA, 1 relay open 44MA, 2 relays open 77MA, 3 relays open 110MA,4 relays open 140MA
3: "open" "close" "Momentary" "Self-locking" "Interlock" "Delay" 6 Commands
4: Two instruction-control mode : AT command and MODBUS command
5: Under the AT command ,the maximum delay is 9999 seconds
Under the MODBUS command ,the maximum delay is 255 seconds
6 AT commands can be made serial HyperTerminal (serial assistant) Enter;
MODBUS commands can be made serial HyperTerminal (serial assistant) OR "Modbus Poll" Enter;
7 Under the MODBUS command mode, it can support up to 32 devices in parallel
8 Size: 80 * 47 * 19.5mm
9 Weight: 57g
10 Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC
Provide the following information:

Wiring Diagram:


1 DC 12V control circuit,Wiring diagram below. "LOAD" may be camera,LED lights, fans, motors and other DC 12V equipment


2 DC 1-100V 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 Lights, fluorescent lights, solar water heaters and other DC AC equipmen CE040_11

3 DC 1-100V OR AC 85-265V control circuit,Wiring diagram below(Note:If not DC 12V load, need another DC 12V power supply). "LOAD" may be Machine tool ,CNC,3D Printer,LED lights, fans, motors and other DC AC equipmentCE040_12

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.