3-1
3
3
Operation
3.1
INTRODUCTION
This section describes the operation of the N4865A GPIB
LAN Adapter.
3.2
OPERATION
3.2.1 Oscilloscope Discovery and Linkage
At power turn-on, the N4865A performs a selftest for 4 seconds and then blinks
its GPIB address. If the N4865A is set for dynamic IP addressing, it attempts
to locate a server for 15-20 seconds before defaulting to its Auto IP address
of 169.254.48.65. If the N4865A is set to a static IP, it immediately assumes
that IP address.
If AutoFind is enabled, the N4865A does a UDP broadcast and waits for a
reply. It then queries any replying oscilloscope to see if it has a VXI-11.3
RPC Service. If one is found, the N4865A attempts to open communication
channels with it. The N4865A will attempt to open communication channels
with the fi rst VXI-11.3 oscilloscope it fi nds.
While the N4865A can communicate with an oscilloscope at any legal IP ad-
dress, the N4865A's ability to communicate with an oscilloscope is limited
by the network topology, its Net Mask and Gateway settings. The factory set
N4865A can communicate to an oscilloscope in the AutoIP B address range
of 169.254.xxx.xxx. To improve chances of a successful linkage, connect the
N4865A to its companion oscilloscope in a back-to-back confi guration or through
a hub. Check the Net Mask and Gateway settings of all of the devices in the
communication path for their affect on communication between the N4865A
and the oscilloscope.
Operation
Summary of Contents for N4865A
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