Moxa Technologies OnCell G3111-HSPA series, Руководство пользователя

Страница: 87 / 127

OnCell G3111/G3151-HSPA Series Introduction to Serial Port Operation Modes
A-4
Types of Reverse Real COM Connection
1. Reverse Real COM to PC’s IP address.
Most cellular service providers only provide customers with a dynamic private IP address, which means that
the OnCell G3111/G3151-HSPA will only obtain an IP address once it is connected to the cellular network.
Reverse Real COM is a great feature that allows a PC host to access an OnCell G3111/G3151-HSPA
configured with a private IP address.
2. Reverse Real COM to PC’s domain name.
With Reverse Real COM mode, you can connect to a PC host using the PC’s IP address. You can also connect
to your PC host with the PC’s domain name, if you have one. Refer to Appendix C for more information.
RFC 2217 Mode
RFC-2217 mode is similar to Real COM mode in that a driver is used to establish a transparent connection
between a host computer and a serial device by mapping the serial port on the OnCell G3111/G3151-HSPA to
a local COM port on the host computer. RFC2217 defines general COM port control options based on the Telnet
protocol. Third party drivers supporting RFC-2217 are widely available on the Internet and can be used to
implement virtual COM mapping to your OnCell G3111/G3151-HSPA’s serial port. Refer to Appendix B for more
information.
Socket Applications
The OnCell G3111/G3151-HSPA offers the following modes for socket applications: TCP Server, TCP Client, and
UDP.
TCP Server Modes
In TCP Server mode, the serial port on the OnCell G3111/G3151-HSPA is assigned a port number. The host
computer initiates contact with the OnCell G3111/G3151-HSPA, establishes the connection, and receives data
from the serial device. This operation mode also supports up to 2 simultaneous connections, enabling multiple
hosts to collect data from the same serial device at the same time.
As illustrated in the figure, data transmission proceeds as follows: The host requests a connection from the
OnCell G3111/G3151-HSPA, which is configured for TCP Server mode. Once the connection is established, data
can be transmitted in both directions between the host and the OnCell G3111/G3151-HSPA.