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Quick Details

  • Place of Origin: Guangdong, China (Mainland)
  • Brand Name: King Pigeon
  • Model Number: S271
  • Type: 4AIN 4DIN 4Dout 1Temperature 1USB Port S271 GSM GPRS 3G Modbus RTU
  • Certificate: CE FCC ROHS
  • Digital input: 4
  • Analog input: 4
  • Relay Output: 4
  • Protocol: Modbus TCP
  • Temperature Humidity: 1 temp and humidity input
  • USB Port: 1
  • Backup Battery: Yes
  • Programmable: SMS, PC, App

Packaging & Delivery

Packaging Details box
Delivery Time 2
Product Description

  4AIN 4DIN 4Dout 1Temperature 1USB Port S271 GSM GPRS 3G Modbus RTU

3G RTU Controller S271 with 4AIN 4DIN 4Dout 1Temperature 1USB Port

GSM RTU Controller S271 with 4AIN 4DIN 4Dout 1Temperature 1USB Port

The   GSM 3G RTU is a multi I/O port remote terminal unit. It is special for BTS monitoring, remote data acquisition, telemetrically, BTS access control and other applications. It supports voice communication, SMS, GPRS communications.

GSM 3G RTU  can be used as remote access control; the authorized users can open the gate or turn on the machine with a free charge call at specified time.


The GSM 3G RTU supports Modbus TCP, TCP/UDP protocol, transparent data transmission over GPRS, performs as Modbus Slave.


S27x GSM RTU Controller Table




 App For Program and Operation:

PC Configurator:

Mainly Features:

1.      ARM® Cortex™-M4 32 Bit RISC Core, 168 MHz inside, RTOS system;

2.      Widely Rated voltage range, 9~36VDC, Inbuilt large capacity rechargeable backup battery;

3.      Large internal memory for save 1000 historical data, USB port for configuration and upgrade firmware;

4.      2 analog inputs, 12bits, supports 0-5V, 0-20mA, 4-20mA;

5.      2 Relay outputs, 5A/30VDC,5A/250VAC;

6.      2 digital inputs, dry contact or level input. One of the input can be used as counter;

7.      1 temperature probe input, 1 humidity transducer input;

8.      2 IP data centers, supports Modbus TCP,TCP/IP protocol over GPRS/3G network;

9.      Automatically resend the data while communication failure, GPRS failure will alert by SMS text;

10.   Supports remotely restart the RTU, and configure it by SMS commands remotely;

11.   Supports over voltage protection and phase-reversal protection;

12.   10 SMS Alert and auto dial numbers, can program to receive specified alarm message.

13.   10 access control authorized numbers, can open the BTS door or turn on/off machine with a free charge call at the specified time.


    Standard Package list

    S270 M2M RTU Controller unit  *1

    AC/DC Power adapter *1 (AC100~240V to DC 12V/2A, UK/USA/EU/AU plug available)

    CD (PC Programming tool and User Manual)  *1

    GSM Antenna *1

    Connectors *1 set

    Optional Accessories:

    Water Overflow Level Sensor, Oil Overflow Level Sensor, Water Leak Sensor, Temperature Sensor, Door Sensor, PIR Motion Sensor, Smoke Sensor, Gas Leak Sensor, Glass Break Sensor, Shock Sensor, Power failure sensor, etc.


Packaging & Shipping


Our Services


Company Information


King Pigeon is a professional GSM/GPRS/3G wireless Alarm System, GSM elderly alarm,SMS Controller, Industrial Remote Controller, RTU Data Logger, Telemetry, Temperature Measurement Logger, Power Monitoring, M2M products Designer & Manufacturer in China since 2005.

Welcome OEM/ODM Service


Put Your LOGO on Unit and Package Available! 


1.  How to make sure the quality?

  •  Process Quality Control
  •  Final Quality Control
  •  Outgoing Quality Control

2.  How to get the order?

  • First,Tell us the model and quantity of the products you want.
  • Second ,we will make a PI for you.
  • Third, After confirm everything,the payment will be arranged (Paypal, Western Union,T/T or Ali Trade Assurance for your money safety are welcomed)
  • Fourth, we will send you the goods within the promissory time.

3.  How about the Shipping?

  • The DHL,UPS,Fedex,TNT usually calculate the shipment based on measure size or weight. They compare the measurement size in Cube meters and Gross weight, and choose the large value to calculate the shipment cost.  (Calculation Formula is : L*W*H/5000=Measurement Size weight, unit is cm)


  •  Reference Shipment Cost

        For example, ship to Denmark from China.



Shipment Cost

Average Cost for per Kg


























  •  Our recommends:

          For samples, ship by Express, usually 3-5days.

          While place small order, try to make the finial weight more than 21Kg.

          If the order weight less than 100Kg, recommend to ship them by Express.

          If the weight is 101kg~200kg recommend to ship them by Air-cargo or express;

          If the weight is above 200kgs, recommend to ship them by air cargo or by sea.

  • For small order by express, 20-30 pcs per order is the best. 

4.  What's the delivery time?

  • Sample within 1-3days;
  •  Wholesales 4-7days according different quantities;
  •  OEM 7-14 days after all info confirmed.
  • ODM depends on the detail requirements.

5.  What is the warranty of your company?

  • 2~3 years warranty for the main unit; one year warranty for the accessories.
  • Please send back the defective goods within the warranty period, we will repair them or send you new free.
  • Please send to us some pictures and video about it need to confirm your problem then we will send you free new goods or parts instead.

6.   Can you do the design for us?

Yes, Just tell us your idea (logo,text., etc) and our professional R&D team will help to carry out your ideas into reality.


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