OnCell G3100 Series
Introducing Serial Port Operation Modes
4-5
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. 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 G3100 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 G3100’s serial port. Please refer to Appendix B for more information.
Socket Applications
The OnCell G3100 offers the following modes for socket applications: TCP Server and Secure TCP Server, TCP
Client and Secure TCP Client, and UDP.
TCP Server and Secure TCP Server Modes
In TCP Server mode, the serial port on the OnCell G3100 is assigned a port number. The host computer initiates
contact with the OnCell G3100, 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 G3100, 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 G3100.
TCP Server mode includes optional data encryption using SSL