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FS-8704-11 Telnet Driver Manual Page 6 of 6
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web:www.fieldserver.com
Tel: (408) 262-2299 Fax: (408) 262-9042 Toll_Free: 888-509-1970 email: support@fieldserver.com
9. Running Serial Protocols over Telnet using Virtual Ports
The Telnet driver can be used to run serial protocols over TCP. To connect the Telnet driver to
a serial driver, use virtual comports. Virtual comports are software emulations of real comports,
and are connected in pairs. These connected pairs are ports VC1 and VS1, VC2 and VS2, VC3
and VS3, VC4 and VS4, and VC5 and VS5. Anything written to the port VCx will be received at
the port VSx, and vice versa. Note that autoconnect mode does not modify the data passing
through in any way; it overrides any linefeed or tab options that might have been set.
Serial ports on two FieldServers may be connected over TCP in this way, using a Telnet client
on one end and a Telnet server on the other. The client is configured to connect to the server
using Telnet, and both client and server autoconnect to the desired serial ports on the
respective FieldServers. The two serial ports are then transparently linked.
10. Limitations
The Telnet driver will only capture ports that have been specified in the configuration file
used by the FieldServer. It will use the specified port parameters (baud rate, start/data/stop
bits, parity), or FieldServer defaults where these have not been specified.
11. Revision History
Date
Driver
Version
Document
Revision
Resp Comment
09/05/02 1.00 0 JCE JCE-Created Document
09/06/02 1.00 1 MF MF-Reformatted Document
7/23/03 1.00 2 JD Releasing