User Manual

Technical Manual for Master Terminals of the Series IF 152x
Page 33
PING
With PING, the connection between two network users can be checked.
PING is started at a network host or via dialog station, which is connected to the master terminal, by
entering the target internet address or the assigned host name (not possible at the master terminal).
Once the connection has been built up successfully, the target system acknowledges the inquiry. The
acknowledgement itself is displayed according to the respective operating system.
# OC menu $ PING XXX.XXX.XXX.XXX (X= user's IP address).
An invocation without a positive acknowledgement can mean that:
• one of the users is not correctly connected to the network.
• one of the user connections is defective.
• the invoked IP address is not available within the network.
• a connection via router or gateway is not possible.
Please check:
• the connection of the master terminal to the network.
• the specified internet address.
• the routing table.
How to Check the Master Terminal via TELNET
TELNET is a service/terminal emulation program and usually part of the TCP/IP programs that run on
WIN 95/ NT. The target IP address and port number 23 are specified when TELNET is started. Then
the connection to the target is built up.
If the IP address and the port number of the master terminal are entered as the target during the
invocation procedure and the connection is set up successfully, it is possible to address the master
terminal directly with IT data records, e.g., to poll the software version number or also to
activate/deactivate a relay. An operative master terminal responds to each data record received. The
response is displayed on screen at the "TELNET station".
# TELNET XXX.XXX.XXX.XXX YYYY (X= IP address of the master terminal, Y= port number)
The software version number can be polled of the master terminal can be triggered with the following
IT data records:
# Ctr A
10 Ctrl X (master terminal A, poll software version)
An unsuccessful connection set up can have one of the following reasons:
• one of the users is not correctly connected to the network.
• one of the user connections is defective.
• the invoked IP address is not available within the network.
• a different port number is specified in the master terminal.
• a connection via router or gateway is not possible.
Please check:
• the network connection with PING.
• the network-specific parameters in the host.
• the internet address in the master terminal.
• the routing entries in the master terminal.
• the function of the internal emergency power supply (LED charge control on), if available.
Keep-Alive Function
A keep-alive function is provided in order to periodically send messages to the system server. The
function can freely be parameterized.