Nimbus Technologies
Nimbus Technologies
Manpada, Dombivli, Maharashtra
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GPRS RTU-Modbus With I-O For Remote Data Acquisition

GPRS RTU MODEM is an extenssion of DTU,  It has in addition to M2M inteface a powerful Server software, Few Inbuilt AI/AO/DI/DO, Multiple Serial port & Ethernet port in Advanced versions. Some Modems Have SD Memory for data logging. Some RTU has dedicated Modbus Master function Built in to interface to Modbus device through RS485 / TCP port.

GPRS RTU communication is Bi-directional to get & set I/O.

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GPRS RTU Modem With AI/DI/DO & Ethernet, RS485  Port
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GPRS RTU Modem With AI/DI/DO & Ethernet, RS485 Port

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G-4500 RTU -Intelligent GPRS Remote Terminal Unit, 
The G-4500 RTU is an intelligent Active GPRS Remote Terminal Unit which is built-in the specific firmware in G-4500 series. It is designed for communicating with Modbus RTU devices and provides active data transmission via GPRS connection. Except for the Modbus RTU’s data, the built-in I/O and GPS data also can be transferred to RTU Center software by the defined period or DI/AI trigger. With the built-in redundancy communication paths of GPRS and Ethernet in G-4500 RTU, the data would be guaranteed to transfer to host. Furthermore, G-4500 RTU provides simple I/O linkage control and the built-in I/O recorders in SD card.

We also provide M2M RTU center software with friendly Graphic interface to manage the GPRS RTU products easily. Users can monitor the I/O data and status of 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.

Easy to Establish GPRS Network Applications Applying the G-4500 RTU and M2M RTU center software, the dynamic IP addresses can be managed between them. The remote GPRS RTU product would connect to M2M RTU Center automatically. Therefore, all remote GPRS RTU devices can be managed by the single centralized M2M GPRS RTU Center software with a fixed IP address.

Active data transmission

The G-4500 RTU devices with active I/O transmission mechanism can raise the communication. Unlike the traditional poll communication, G-4500 RTU 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.

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GT-541 Intelligent Multiport Serial to GPRS Gateway 


  • Quad-band 2G Modem Operating of 850/900/1800/1900 MHz Virtual COM Extend Real COM Ports via GPRS Remote Configuration by Virtual COM 1 x RS-232 port and 1 x RS-485 port for Virtual COM. 1 x Utility port for Confi guration Built-in Watch-dog Function ,Power Reverse Polarity Protection ,Power supply +10 VDC ~ +30 VDC , DIN-Rail mountable 


  • GT-541 is an intelligent multiport serial to GPRS gateway for industry M2M applications. It is designed for linking RS-232/485 devices to a GPRS network. The user-friendly VxComm Driver/Utility and VxServer allow users to easily turn the built-in COM ports of the GT-541 into standard COM ports on a PC. By virtue of its protocol independence, a small-core OS and high flexibility, the GT-541 is able to meet the demands of every network-enabled application. M2M solution will 
  • improve the service quality and reduce operating costs. Many application areas can be improved by using GT-541. 


  • Models GT-541 
  • System :CPU 32 bit 
  • SRAM 32 Kbytes 
  • Flash Memory 512 Kbytes 
  • WDT Yes 
  • 2G System 
  • Frequency Band Quad-band: 850/900/1800/1900 MHz 
  • Compliant with GSM Phase 2/2+ Class 4 (2 W @ 850/900 MHz); Class 1 (1 W @ 1800/1900 MHz) 
  • Coding Schemes CS 1, CS 2, CS 3, CS 4 
  • Serial Ports :Unility Port RS-232: TxD, RxD, GND (use for device configuration and debug) 
  • COM 1 RS-232: TxD, RxD, GND (use for communication with other devices) 
  • COM 2 RS-485: D+, D-(use for communication with other devices) 
  • Baud Rate 9600 bps ~ 115200 bps 
  • Power :Protection Power reverse polarity protection 
  • Frame Ground Protection ESD, Surge, EFT, Hi-Pot 
  • Required Supply Voltage +10 VDC ~ +30 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 °C ~ +75 °C 
  • Storage Temperature -40 °C ~ +80 °C 
  • Humidity 5% ~ 90% RH, Non-condensing 


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GT 540 - Modbus GPRS RTU Modem With I/O
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GT 540 - Modbus GPRS RTU Modem With I/O

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The GT-540 is an intelligent Active GPRS Remote Terminal Unit. Within the high performance 32 bit CPU, the GT-540 is suit for the hard industrial environment. It features GPRS/GSM module, 6 digital inputs, 2 digital outputs, 1 analog input, 2 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 by 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, the GT-540 offers the e-mail mode to transfer the data by e-mail via GPRS for users to choose. The simple I/O linkage function of the GT-540 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, the GT-540 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 GPRS and the Internet.
  • Automatic/continuous 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 GPRS I/O devices
  • Support data transferring by E-mail
  • Local I/O linkage function to make the simple local control
  • Support 3.7V Li-ion Battery backup
  • Power supply 10 ~ 30 VDC

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Analog Alarm Controller
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Analog Alarm Controller

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The M1000 is a rugged cellular smart modem offering state-of-the-art GSM/GPRS connectivity for machine to machine (M2M) applications.
Built-in software selectable RS232/RS485 interfaces, with 15KV ESD serial line protections. Six LED indicators provide signal strength(RSSI) and status.
The modem supports a wide range of input  voltages from 9 to 36VDC and a wild range of temperature from -25 to 70 deg C
the metal enclosure ca be mounted on a DIN-rail or on the wall, also with extra ground screw.

Additional Information:
  • Item Code: AAC
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