by Brent Raynor
  • Cellular IP Modems (Gateways) allow the user to communicate with serial or ethernet devices from a remote location.
  • Cellular networks use GSM (Global System for Mobile Communication) as a global standard.
  • Data is transmitted to the remote device throught the use of the internet and a cellular modem.
  • To gain a better understanding, the diagram below is broken into four sections:
  • a) Server b) Internet c) Dynamic Cellular IP Network d) Moxa OnCell G3150 IP Modem

  • Server
  • The first step is assign a static IP address on the laptop.
  • Step 1
  • Windows XP:  Click Start > Control Panel > Network Connections.
  • Windows 7:     Click Start > Control Panel > Network and Sharing Center.
  • Step 2
  • Right click on Local Area Connections and select Properties.
  • Step 3
  • Highlight Internet Protocol (TCP/IP) and click Properties.


  • Step 4
  • Click “Use the following IP address” and enter an IP address that is on the same subnet as your network or the LAN IP address of your router.
  • Example: If the Moxa OnCell G3150 LAN IP address is, set the IP address of the computer to 192.168.127.x, where x is a number between 1 and 253, provided this IP address is not being used on your network.
  • Step 5
  • Click OK twice to save your settings.

  • Internet
  • A static IP address must be requested from your ISP (Internet Service Provider).
  • Most internet users use dynamic IP addresses, which means each time they connect to the internet, their ISP assigns a new IP address.
  • In order to communicate with the Moxa Oncell G3150 in the field, a static IP address must be assigned to the router.
  • This static IP address is also identified in the Moxa OnCell G3150.
  • Dyanamic Cellular  IP Network
  • Obtain a M2M (machine to machine) data sim card.  The data sim card must have a dynamic IP address and an APN (Access Point Name) from the M2M service provider.
  • M2M allows machines to communicate with one another over a cellular network.
  • M2M is a platform that allows the user to diagnose issues, monitor, and to receive alerts.
  • The Moxa OnCell G3150 is an industrial RS-232 and RS-232/422/485 GSM/GPRS/EDGE IP gateways (modem).
  • To better understand M2M cellular providers, click on the following weblink http://m2m.com/index.jspa (Community for machine-to-machine, embedded wireless, and connected consumer devices development).


  • Moxa OnCell G3150 IP Modems (Gateway)
  • Cellular IP Modems use a non proprietary cellular technology called GSM (Global System for Mobile Communication).
  • GSM is commonly used for voice calls and SMS (Short Message Service).
  • In sending and receiving high speed data, GPRS (General Packet Radio Service) is recommended.
  • GPRS is a digital based protocol that runs over the GSM network.
  • GPRS is based on data and GSM is based on time.
  • GPRS has two advantages over GSM: 1) Communication speed   2) GPRS enable devices are in the “always on” state. is communication speed.
  • The communication speed of GPRS is 115Kbs and GSM is 9.6Kbs. This means that GPRS is roughly 11 times faster than GSM.
  • The second advantage is GPRS enabled devices are in the “always on” state. This means that you are only charged for the amont of data sent and received.


At Manufacturers Automation Inc., we are dedicated to customer service and want
to make your experience with Moxa a pleasant one.
Manufacturers Automation Inc.
1600 King Street North
P.O. Box 602
St. Jacobs, ON
800-387-6268 Tel.
519-664-3300 Tel.
519-664-1600 Fax.