Perle Systems 5500161-40 - Manual (Page 162)

Serial Port Profiles
162 IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.0
Serial Tunneling Profile
Overview
The Serial Tunneling profile allows two IOLANs to be connected back-to-back over the network to
establish a virtual link between two serial ports based on RFC 2217.
Functionality
The serial device that initiates the connection is the Tunnel Client and the destination is the Tunnel
Server , although once the serial communication tunnel has been successfully established,
communication can go both ways.
A more detailed implementation of the Serial Tunneling profile is as follows:
IOLAN
pe
rle
Network
Serial
pe rl e
IOLAN
Serial
Client
Tunnel
Server
Tunnel
The Server Tunnel will also support Telnet Com Port Control protocol as detailed in RFC 2217.
IOLAN
per
le
Network
Serial
Server
Tunnel Running
2217 Application
The IOLAN serial port signals will also follow the signals on the other serial port. If one serial port
receives DSR then it will raise DTR on the other serial port. If one serial port receives CTS then it
will raise RTS on the other serial port. The CD signal is ignored.