Keri Systems NXT Network Connection - Manual (Page 8)

NXT Network Connection
Troubleshooting Guide
Page 8 of 11 P/N: 01508-001 Rev. A
5.0 Tools
The following tools can be useful when trying to troubleshoot and resolve connection issues. The purpose of these tools is
to validate that a connection exists at the lowest network level.
5.1 System Reset / Default IP
After a system reset, the controller’s IP address reverts to its default IP address of 169.254.1.1. This process should be
used if you are unable to complete an autoconfig of a controller and need to validate that the controller is communicating
and functioning properly.
In order to communicate to a reset controller, perform the following steps:
• Change or add an IP address of the computer to be within the 169.254.x.x subnet using a subnet mask of
255.255.0.0. Example 169.254.0.1.
NOTE: It may not be necessary to change the computer’s IP address, as Windows will often perform an Auto IP
and assign an IP address that is within the 169.254.x.x subnet range when it cannot get an address from a DHCP
server.
• Using a cross over cable to isolate the controller from any other controllers or devices on the network, attempt to
connect to the controller using Ping or Telnet.
NOTE: Some network adapters are autosensing and a standard patch cable can be used instead of a cross over
cable.
5.2 Ping
Confirms basic connection route to another networked device. The Ping utility is a command line tool that will send a
small packet to the designated device and expect a response from that device. To use Ping, open a command prompt (DOS
prompt) by clicking on Start / Run and enter cmd in the Open: field and click on OK. A new window will appear with a
command prompt: C:\>. The actual prompt may differ from computer to computer.
To run the Ping command, enter at the command prompt:
C:\>ping <ip address>
Where <ip address> is the IP Address or name of the target device. The ping is successful if a reply is received from the
target device.
Figure 5: Successful Ping