The Telnet driver can act as a Telnet Client or Server. As a Server it supports the following options:
- Telnet sessions initiated by standard Telnet clients, allowing users to access a Command Line Interface on the FieldServer.
- Serial Port Capture on the FieldServer to allow user interaction with serial devices via Telnet, either through the Telnet server user interface, or by pre-configured auto-connect.
- Pre-configured binary connection from Telnet to Serial Port, i.e. as a Remote Serial Port Server which can be used by PC-based serial port redirectors. Present support is for “raw TCP” mode; RFC2217 port control functionality will be implemented in future.
- Any serial protocol supported by the FieldServer may be run in a Serial-over-Ethernet mode, e.g. TL1.
As a Telnet Client the FieldServer can connect to another Telnet Server, for example to provide seamless serial-to-serial connectivity between two FieldServers over Ethernet.
|Client||10||The FieldServer supports 10 simultaneous connections as a Telnet Client.|
|Server||10||The FieldServer supports 10 simultaneous connections as a Telnet Server.|
Formal Driver Type
Client or Server
- For each Telnet Client or Server connection on a FieldServer a different IP Address and IP Port number may be specified. It is thus possible to map multiple ports on a single FieldServer to multiple TCP connections.
- In Text Mode options exist to control echoing of typed characters, as well as the rendition of carriage return, linefeed and tab characters.
- In Text Mode the Telnet Server supports user authentication through a username and password configured on the FieldServer.
- A connection timeout may be configured to control recovery from lost connections through device or cable failures.