OnCell G3111/G3151-HSPA Series
Introduction to Serial Port Operation Modes
A-2
Device Control Applications
The OnCell G3111/G3151-HSPA offers the following modes for device control applications: Real COM, Reverse
Real COM, and RFC2217 modes.
Real COM Modes
The OnCell G3111/G3151-HSPA comes bundled with Moxa drivers for Windows
NT/2000/XP/2003/2008/Vista/7 systems and TTY drivers for Linux and Unix systems. (For Windows systems,
this option is only supported for Windows 2000, XP x86/x64, 2003 x86/x64, Vista x86/x64, 2008 x86/x64 and
Windows 7 x86/x64.)
In Real COM mode, the bundled drivers are able to establish a transparent connection between a host and a
serial device by mapping the serial port on the OnCell G3111/G3151-HSPA to a local COM/TTY port on the host
computer. Real COM mode supports up to 2 simultaneous connections that enable 2 hosts to simultaneously
collect data from the same serial device.
One of the major conveniences of using Real COM mode is that it allows you to use software that was written
for pure serial communication applications. The OnCell COM driver intercepts data sent to the host’s COM port,
packs it into a TCP/IP packet, and then redirects it through the host’s Ethernet card to the Internet. At the other
end of the connection, the OnCell G3111/G3151-HSPA accepts the IP frame from the cellular network, unpacks
the TCP/IP packet, and then transparently sends the data through the serial port to the attached serial device.
Types of Real COM Connections
This section illustrates the types of Real COM 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-HSPA 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-HSPA via a host PC using a fixed public IP. Since the IP address
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