Moxa IP Modem Solutions

Cellular IP Modem Overview


Now that we've got your attention, do you know what a cellular IP modem is? How does it compare with a cellular modem? In fact, why would your applications need cellular IP modem solutions anyway? Cellular IP modems are designed for use with devices that use built-in legacy operating systems that do not support Ethernet or TCP/IP networks. In other words, cellular IP modems offer a method of transmitting data over TCP/IP networks. If your applications need to access remote devices from a central location via the Internet and cellular network, then using a cellular IP modem will allow you to integrate TCP/IP architecture and wireless cellular technology.



The following table presents the major distinctions between cellular IP modems and cellular modems:

Cellular IP Modem
Cellular Modem
Wireless interface
Dialing capability
TCP/IP stack
Local memory
8 MB RAM, 4 MB Flash
PSTN modem or cellular modem at both ends
Not required
Required (except GPRS)

Introducing Moxa's OnCell G3100 Series of Cellular IP Modem Solutions

The OnCell G3100 series is a new line of industrial cellular products from Moxa. The OnCell G3100 is an industrial quad-band 850/900/1800/1900 MHz IP modem capable of transmitting data over GSM/GPRS/EDGE mobile networks to anywhere in the world. The OnCell G3110 supports the RS-232 interface, and the OnCell G3150 supports RS-232/422/485. In addition, both products have 15 KV ESD surge protection built in, and are designed with an industrial form factor that supports DIN-rail mounting.

Moxa's solutions compare favorably with cellular modems that require using an IPC to provide dialing capability for sending messages over the cellular network to the control center. The IPC-based solution has limitations, since it can only be used to establish a point-to-point passive connection from the control center side. In comparison, Moxa's OnCell G3100 cellular IP modems come with a number of advanced features, including Ethernet Modem mode, Reverse Real COM mode, Flexible Connection Mode, choice of TCP/IP connection, and I/O functionality to help you to overcome problems from high-speed transmission.

For more information, click here to download more detailed information about Moxa's cellular IP modem solutions.

Ethernet Modem mode was designed for use with legacy operating systems and communication protocols (AT commands, for example) that do not support TCP/IP networks. Connecting a properly configured OnCell G3100 port to the legacy device's serial port allows you to use legacy software to transmit data over the cellular network, even though the software was originally designed to transmit data over a modem. This is accomplished by converting dialed AT commands into IP format. General speaking, ISPs can only provide customers with a private IP ( for connecting over a cellular network. One of the problems this poses is that the IP address could change frequently, which means that the connection between the host and the serial device will be offline until you can reconfigure the IP address in the cellular IP modem. However, with “Reverse Real COM mode,” the Moxa driver that comes with the OnCell G3100 IP modem can establish a transparent connection from the serial device side to the host side by mapping the serial port to a local COM port on the host computer. In other words, Reverse Real COM mode can solve the problem of using a private IP with a SIM card.

Moxa's industrial cellular IP modems, the OnCell G3110 and OnCell G3150, are the most intelligent, secure, and versatile products of this type available. Both products provide remote access, support TCP/IP, can be configured over the network, and can be used for applications that require providing remote access to devices at outdoor sites where it is difficult or impossible to install land lines. Examples include offshore sites, mountain locations, the roofs of buildings, or next to highways.

Features of the OnCell G3100 Series of Cellular IP Modems

  • Quad-band GSM/GPRS/EDGE 850/900/1800/1900 MHz
  • Choice of operation modes, including TCP Server/Client, UDP, Real COM, Ethernet Modem, RFC2217, and SMS Tunnel
  • Reverse Real COM mode (solves the private IP problem!)
  • Secure modes for TCP Server, TCP Client, Real COM, and Reverse Real COM
  • Choice of configuration methods, including web console, serial console, and Telnet
  • SMS Tunnel Mode
  • Versatile GSM/GPRS/EDGE connection types including always-on and inactivity time
  • Redundant/backup Ethernet line
  • DIN-rail vertical design
  • Redundant power inputs
  • DIO for easier sensor and switch connections
  • -30 to 55°C operation temperature for standard models

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