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CHAPTER2 Ethernet Unit
2-8-3 Description of TELNET dedicated parameters
■ PORT (TCP port No.)
Use this parameter to set the TCP port No. of the controller.
The port No. set here is specified along the IP address when the client connects to the
controller.
Input range : 0 to 65535
Default value : 23 (TELNET port)
* If any value other than 23 (TELNET port) is specified then negotiation with the
TELNET protocol is impossible. (Switches to ordinary socket communication.)
* Using a port No. other than the well-known ports (0 to 1023) is advised when
changing the port.
* After changing the setting, restart the controller to enable the settings you made.
■ ECHO (echoback)
Use this parameter to select whether or not to send back (echoback) to the client, the
same characters that the client sent to the controller.
Input range : 0 or 1
Meaning : 0 :No echoback
1 : Echoback
Default value : 1
■ TOUT (communication timeout)
Using this parameter allows cutting the TELNET connection if data is not sent or
received from the client or controller within a certain amount of time.
Set the number of minutes after which the TELNET communication will be cut.
Setting “0” (zero) here voids the timeout check and there is no timeout to cut the
TELNET connection.
Input range : 0 to 255 (minutes)
Default value : 10
■ IDLE (no-reply timeout)
If no-reply at all has come back from the client, a packet (Keep Alive packet) can be
sent at fixed intervals to verify if the other party is present. This parameter sets the
time intervals between transmissions in seconds.
If the no-reply state continues for (IDLEx3) a certain period (default is 15 seconds),
then an error has occurred and TELNET communication is cut.
Setting “0” (zero) here prevents sending a Keep Alive packet and the connection with
the client is not cut even if the no-reply state continues.
Input range : 0 to 255 (seconds)
Default value : 5
* The Keep-Alive packet is issued automatically by the controller. This packet has no
effect on data sent and received by the user.