Chapter 6
Using Your GPIB-ENET/100 and NI-488.2
©
National Instruments Corporation
6-3
GPIB-ENET/100 for Windows Me/98/95
information. Notice that if DHCP fails to assign you an address, the current
subnet might not have an address available for you to use. In this case, you
may have to move your product to another subnet where there is an
available IP address.
Failure also happens if communication between DHCP and DNS does not
occur. In this situation, DHCP assigns an address to the device, but you
cannot communicate to it using the hostname you assigned. Your network
administrator may have to manually insert the hostname into the DNS table.
Alternatively, you can use the NI Ethernet Device Configuration utility to
determine the hostname associated with your assigned IP address, and
change the hostname to match the DNS entry. Refer to the
information.
Because there are many other possible reasons for failure, contact your
network administrator if you are having problems getting DHCP to work.
When you can use DHCP and DNS successfully, you can use the hostname
form of the IP address to communicate with your product—even if the
numerical IP address changes with successive reboots.
If you are setting up a small network for your instrumentation system,
it is recommended to use static IP addresses, because they are easier to
implement and maintain. In this system, you can safely use the numerical
form of the IP address to communicate with your product because the
address is unlikely to change. Small networks are less likely to have domain
name services available that would resolve the hostname into a numerical
IP address.
Using the CFG RESET Switch
The Configuration Reset (CFG RESET) switch is a recessed switch located
beside the ENET connector on the rear panel. Refer to Figure 2-4 for an
illustration of its location.
This switch performs two functions, depending on whether you press it
while switching the power on or during operation.
Using the CFG RESET Switch during Operation
While the GPIB-ENET/100 is operational, as indicated by a steady yellow
PWR/RDY
LED, you can use the CFG RESET switch to place the box into
network configuration mode. You then can use the NI Ethernet Device
Configuration utility as described in Chapter 3,
