User`s manual
Table Of Contents
- 1. Introduction
- 2. Getting Started
- 3. Initial IP Address Configuration
- 4. Introducing Serial Port Operation Modes
- 5. Introducing OnCell Central and Ethernet Operation Modes
- 6. Using the Web Console
- 7. Cellular Network Settings
- 8. Configuring Serial Port Operation Modes
- 9. Configuring the Cellular-Enabling Ethernet Device
- 10. Configuring OnCell Central Management Software
- 11. Additional Serial Port Settings
- 12. System Management Settings
- 13. Software Installation/Configuration
- A. Pinouts and Cable Wiring
- B. RFC2217
- C. Dynamic Domain Name Server
- D. Well Known Port Numbers
- E. Auto IP Report Protocol
- F. GSM Alphabet
- G. Default Settings

OnCell G3111/G3151/G3211/G3251 Series User’s Manual Serial Port Operation Modes
4-4
Types of Real COM Connection
This section illustrates the types of RealCOM connections you can use, depending on the service
you obtain from your local cellular service provider.
1. Fixed Public IP for OnCell.
If your cellular service provider offers a fixed public IP address after you connect to the
cellular network, you can access the OnCell G3111/G3151/G3211/G3251 via a host PC using
either a private IP or public IP.
2. Utilize Auto IP report.
If your cellular service provider offers a dynamic public IP address after you connect to the
cellular network, you can access the OnCell G3111/G3151/G3211/G3251 via a host PC using
a fixed public IP. Since the IP address of the OnCell G3111/G3151/G3211/G3251 is changed
each time it is connected to the cellular network, the host IP can be notified of the change by
an Auto IP Report message sent from the OnCell G3111/G3151/G3211/G3251. Please refer to
Appendix E to see the format of the Auto IP Report Protocol.
3. Domain name with DDNS.
If your cellular service provider offers a public IP address after you connect to the cellular
network, you can also access the OnCell G3111/G3151/G3211/G3251 using the domain name.
To do this, you will need to register with a DDNS service provider and then enable the DDNS
function in the OnCell G3111/G3151/G3211/G3251. Please refer to Appendix C for more
information.