User`s manual

OnCell G3111/G3151/G3211/G3251 Series User’s Manual Serial Port Operation Modes
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2. Reverse RealCOM to PC’s domain name.
With Reverse RealCOM 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. Please 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/G3211/G3251 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/G3211/G3251’s serial port. Please refer to Appendix B for more information.
Socket Applications
The OnCell G3111/G3151/G3211/G3251 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/G3211/G3251 is assigned a port
number. The host computer initiates contact with the OnCell G3111/G3151/G3211/G3251,
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/G3211/G3251, 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/G3211/G3251.