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Appendix C
Troubleshooting and Common Questions
Cannot Change Network Settings
Cannot Access Device When Using Hostname
ENET-232 and ENET-485 Series User Manual
•
Verify there are no open network connections. All port LEDs should
be off.
•
Confirm the device is in network update mode. If the PWR/RDY LED
is not alternating rapidly between red and yellow, press and hold the
CFG RESET switch for three seconds to enter network update mode.
For more information, refer to the
section in Chapter 6,
•
If you want to use the same hostname that the device is configured with
and you know its IP address, skip to the next bullet. Otherwise, run NI
Ethernet device configuration. (You must use a computer on the same
subnet as the device.) Refer to Chapter 3,
more information about NI Ethernet device configuration.
•
Verify the device is present on the network by pinging the IP address
of your device. Ping is a network utility that sends a packet to a
device/host on the network, then waits for it to be echoed back, which
indicates an active device/host. Find the directory where
installed and type in the following command:
ping IPaddress
where
IPaddress
server. When your device responds to the ping requests, repeat this
procedure but this time using the hostname:
ping hostname
•
If your device fails to respond when using the hostname, the DNS entry
for the device is incorrect.
•
If the network parameters were statically (manually) assigned, the
hostname must be manually entered in your network's Domain Name
Server (DNS) table before you can use the hostname to communicate
with your device. Have your network administrator enter this
information.
•
You also can manually check that the device's hostname has been
entered in the DNS table by using NSLookup. This network utility
queries the DNS for entries in the DNS table. You can use NSLookup
to determine the hostname associated with any particular IP address
listed in the DNS table. Find the directory where
and type in the following command:
nslookup IPaddress
Using the CFG RESET Switch
Using Your Serial Device
is the IP address assigned to your serial device
C-2
Server.
Ethernet
Configuration, for
is
ping
is installed
nslookup
ni.com
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