GAOTek 4G Temperature Logger

GAOTek 4G Temperature Logger is a data logger with Modbus interface.




GAOTek 4G Temperature Logger is a data logger with Modbus interface. It provides data capturing and transmission over 4G networks. It is a wireless data logger supporting 16 Modbus data registers. It supports 4G mobile networks. It is a 4G Modbus Data Logger with programmable I/O. 4G Data Logger provides faster wireless connection in a more secure and reliable 4G mobile network. Its built-in UPS feature provides user alerts of AC power loss. During power loss, operation is backed up by an internal rechargeable battery. Its internal 4MB memory logs 30000 data records, and expandable to 32GB with an SD card. Data can be uploaded to the server as fast as a 5 seconds interval, or 24 hours to save power. Programmable data logging interval starts from 1 minute up to 24 hours.



  • 2 Temperature Sensors (max.)
  • 1 Humidity Sensor
  • 2 Analog Channels (max.)
  • 3 Digital Inputs
  • 3 Pulse Channels
  • 2 Relay Outputs
  • Modbus RS485 Interface
  • 8 Modbus Data Registers
  • Real Time 4G and SMS Data Upload
  • Integrated 16 bit MCU and Siemens 4G Module
  • Programmable data input type & alert hi/low
  • Programmable Data Upload Interval & Logging Interval
  • Easy setup via USB port by PC software
  • Remote Setup over 4G mobile network
  • Support Dynamic Domain Name or Fixed IP, and UDP/TCP protocol data transmission
  • Flexible AC, DC power with internal battery backup


Technical Specifications

Temperature Sensors 2 Temperature Sensors (max.)
Power Input 9 VDC to 15 VDC
Humidity Sensor 1 Humidity Sensor
Digital Channel Alarm Dry Contact
Analog Channel 2 Analog Channels (max.)
Pulse Channel On,Off Switching
Digital Inputs 3 Digital Inputs
Industrial Protocol Modbus
Pulse Channels 3 Pulse Channels
Communication Protocol SMS
Relay Outputs 2 Relay Outputs
Temperature range -67 ℉ to 257 ℉ (-55 ℃ to 125 ℃)
Modbus interface RS485 Interface
Accuracy +/-0.9 ℉ (+/-0.5 ℃)
Modbus 8 Modbus Data Registers
Alarm Trigger Digital Alarm, AD Level High or Low, Power Loss
Display Type Analog and  Digital
Signal Type 4 mA to 20 mA or 0 VDC to 5 VDC



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