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Cellular Wireless Intelligent GPRS Data Server with 6 Digital Inputs, 2 Digital Outputs and 1 Analog Input. Supports 2G Quad-band 850/900/1800/1900 MHz Frequencies and 3G 850/900/1900/2100 MHz. Provides Wireless Access to Modbus RTU devices. Supports operating temperatures from -25°C ~ +75°C (-13°F ~ +167°F). GT-540-3GWA is phased out and replaced by GTP-541M.


Cellular Wireless Intelligent GPRS Data Server with 6 Digital Inputs, 2 Digital Outputs and 1 Analog Input. Supports 2G Quad-band 850/900/1800/1900 MHz Frequencies and 3G 850/900/1900/2100 MHz. Provides Wireless Access to Modbus RTU devices. Supports operating temperatures from -25°C ~ +75°C (-13°F ~ +167°F). GT-540-3GWA is phased out and replaced by GTP-541M.

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The GT-540-3GWA has officially been phased out and will no longer be available. It has now been replaced by GTP-541M.

GT-540 application

GT-540-3GWA is an intelligent Active 3G Remote Terminal Unit. Within the high performance 32 bit CPU, GT-540-3GWA is suit for the hard industrial environment. It features 3G(WCDMA) module, 6 digital inputs, 2 digital outputs, 1 analog input, 1 RS-232, 1 RS-485 and SD interface. It can be used in M2M application fields to transfer the local I/O or Modbus device's data via GPRS by the defined period or DI/AI triggers. The local I/O data can also be stored in the SD card to become a remote data logger. For another communication path, GT-540-3GWA offers the e-mail mode to transfer the data by e-mail via 3G for users to choose. The simple I/O linkage function of GT-540-3GWA can reach the real time control in local field. It also supports Li-ion battery as another power source when the main power is failed temporarily. Therefore, GT-540-3GWA is an ideal solution for environmental monitoring and remote device management for M2M applications. Meanwhile, it is supplied with easy-to-use API and OPC server Software that streamline application development process, freeing system integrators from dealing with complex communication protocols of 3G and the Internet.



Application 2

  • Automatic/continuous WCDMA/GPRS Link Management
  • Support Modbus RTU protocol to connect to Max 3 Modbus RTU devices via RS-485 port
  • Support M2M OPC server for SCADA system
  • Easy-to-use API tool for users to develop their applications by various program development tools
  • Be the WCDMA/GPRS I/O devices
  • Local I/O linkage function to make the simple local control
  • Support 3.7V Li-ion Battery backup
  • Power supply 10 ~ 30 VDC


ICP DAS provide graphic tool for users to configure GT-540-3GWA. The utility also can help users to test GT-540-3GWA in the Lab before they apply in the real site.

utility 1
utility 2
utility 3

Software Solutions

The M2M RTU center software with friendly Graphic interface is to manage the WCDMA/GPRS RTU products easily. Users can monitor the I/O data and status of WCDMA/GPRS RTU devise by the interface on PC. By using the M2M RTU API tool and M2M RTU center software, any remote monitoring system can be achieved easily and efficiently. For SCADA system, the M2M.OPC server is provided to connect to SCADA by OPC interface.

GT-540 application

software solutions

Web site
M2M RTU Center
EZ Data Logger
InduSoft SCADA
  • Easy to Establish WCDMA/GPRS Network Applications
    It is a big headache for engineers to establish the WCDMA/GPRS applications because the dynamic IP management is required. Applying GT-540-3GWA and M2M RTU center software, the dynamic IP addresses can be managed between them. The remote WCDMA/GPRS RTU product would connect to M2M RTU Center automatically. Therefore, all remote WCDMA/GPRS RTU devices can be managed by s single centralized M2M RTU Center software with a fixed IP address. Moreover, there are M2M API tool and OPC server for engineers to develop the WCDMA/GPRS applications by VB, VC or SCADA development tools conveniently without any IP address management effort.
  • Active data transmission
    GT-540-3GWA with active I/O transmission mechanism can raise the communication. Unlike the traditional poll communication, it would transfer the data by the defined time, DI trigger or AI hi/lo alarm. In addition to improve the way of communication, that can also reduce the AP effort.
  • Transfer data by e-mail
    Expect for the transferring data by the general communication with the M2M RTU center, users can choose the e-mail mode to send these data by e-mail over WCDMA/GPRS in the fixed time.
  • Modbus RTU device connectivity
    GT-540-3GWA is built-in Modbus RTU protocol. That can make any Modbus RTU device connect to GT-540-3GWA. By the way of GT-540-3GWA, Modbus RTU devices can be used in WCDMA/GPRS remote system. The max Modbus RTU device can be connected to GT-540-3GWA is three.
  • Simple Local I/O link Control
    There are I/O built-in WCDMA/GPRS devices of ICP DAS. Therefore, these products can be the WCDMA/GPRS I/O devices. Expect for these local I/O data can be sent to the host PC, the I/O link function of them help users to do the simple control in local field. For example: the DI trigger or high/low AI alarm can driver the DO channel.
  • Built-in I/O Data Logging
    GT-540-3GWA provides an external SD interface. These local I/O and Modbus data are recorded in SD memory card for one day in a single file.

How to Use the GT-540-3GWA

GT-540-3GWA how to use


CPU 32 bit CPU
SRAM 64 Kbytes
Flash Memory 512 Kbytes
RTC Gives time(sec, min, hour) & date, leap year compensation from 1980 to 2079
WDT(watchdog) Yes
SD interface 4GB max.
Serial ports
COM1 RS-232 : TxD,RxD,GND for configuration
COM2 RS-485 : D2+, D2- for modbus device
Digital Input
Input Channel 6
Input Type Sink or Source, Isolated channel with common power or ground
Off Voltage Level +1V max.
On Voltage Level +3.5 ~ 30 VDC
Isolated Voltage 3750Vrms
Counters 6 (5~40Hz), Min. Pulse Width : 25ms
Digital Output
Channels 2
Output Type Open-Collector (NPN) (100mA@30VDC)
Load Voltage +30 V max.
Load Current 100 mA max.
Isolated Voltage 3750Vrms
Analog Input
Channels 1
Resolution 12 bit
Input Range/Type 0 ~ 20 mA
2G system
GPRS/GSM Quad-band 850/900/1800/1900 MHz
GPRS multi-slot : class 10/8
GPRS mobile station : class B
Compliant to GSM phase 2/2+
  - Class 4(2W @ 900 MHz)
  - Class 1(1W @ 1800/1900 MHz)
Coding schemes : CS 1, CS 2,CS 3,CS 4
3G System
Frequency Band WCDMA : 850/900/1900/2100 MHz
Power class Class 3(250mW @ WCDMA/HSPA)
Protection Reverse polarity protection
Frame Ground Protection ESD, Surge, EFT, Hi-Pot
Required Supply Voltage +10 VDC ~ +30 VDC
Power Consumption Idle: 65 mA @ 24 VDC; Data Link: 170 mA @ 24 VDC; Peak: 450 mA @ 24 VDC
Casing Plastic
Flammability UL 94V-0 materials
Dimensions (W x L x H) 91 mm x 132 mm x 52 mm
Installation DIN-Rail
Operating Temperature -25 ℃ ~ +75 ℃
Storage Temperature -40 ℃ ~ +80 ℃
Ambient Relative Humidity 5 ~ 95% RH, non-condensing

References and Support

Customer Reviews (1)

November 30, -0001

Works well with our remote monitoring application - it's robust, reliable, and fast.

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