GPIB commands except for Remote with Lockout and
Local with Lockout. The user will have to be sure that
the instrument supports the device commands used
in the existing program and that the device messages
sent to the 4865 are terminated with the 488.2 New
Line terminator.
Connections
While the 4865 is normally used in a back-to-back
connection with its companion instrument as shown
in Figure 1, it can be connected to the instrument in
other ways.
Figure 2 shows the 4865 connected to the instrument
through a hub. This is a typical lab bench connection.
It lets the user confi gure the 4865 through the hub
while developing the GPIB program.
Figure 3 shows the 4865 connected to the instru-
ment over a company network. The 4865 gives you
standard GPIB control over a LAN instrument no
matter where it is located.
4865's Operation
The 4865 transparently passes all device commands
and IEEE-488.2 Common Commands onto the instru-
ment and returns all instrument responses to the client
application. The 4865 also does such familiar GPIB
tasks as sending Selected Device Clears and Device
Triggers to the instrument, set Local or set Remote
modes and perform Serial Polls. Interface Clears
(IFCs) only affect the 4865's GPIB Interface and are
not passed on to the companion instrument.
The 4865 does a background poll of the LAN
instrument's Status Register and asserts the GPIB
bus SRQ line if a Service Request is detected. When
the 4865 is Serial Polled, the instrument is sent a
de-
vice_readSTB
rpc and the response is returned to the
GPIB Controller.
Setup & Installation
The 4865 is very easy to install. Plug the 4865 into
a network access point adjacent to your computer as
shown in Figure 2 or use an Ethernet crossover cable
to connect the 4865 directly to a PC's network port.
Launch a web browser and point it to the 4865's default
AutoIP address of 169.254.48.65. The 4865's Welcome
page provides all of the information about the 4865's
current settings. On the Confi guration page, you can
set the 4865 to a static IP address or enable the 4865
to accept an DHCP address setting if the network has
a server that can assign network addresses. You can
also set the 4865's GPIB address and a fi xed IP address
for the companion instrument if that works better in
Figure 2 4865 Instrument Hub Connection
Figure 3 4865 Instrument Network Connection
4865 APPLICATIONS
your environment. Set the remaining network parameters, save the
settings and the 4865 is ready to be connected to the instrument and
GPIB bus.
A rear panel LAN Reset button is provided to reset the 4865's
network settings to the factory default settings in case the 4865's
confi guration needs to be reset.
Easy Firmware Updates
The 4865 has a program download and store function which lets
the 4865 receive program changes through its Ethernet interface. If a
future fi rmware change is necessary, the new fi rmware and Upgrade
Utility program can be downloaded from ICS's website. The 4865
validates the new code before saving it in its Flash memory.
Network Features
The 4865 uses the VXI-11 protocol or RPC over TCP/IP to com-
municate with the test program (client application). The TCP trans-
portation layer and IP protocol guarantees error free communication
with the 4865 over the network or Internet as long as the connection
is maintained.
4865 LAN <=>GPIB Interface
GPIB
LAN Instrument
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Line to Company Network
8065 Ethernet to GPIB
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4865 LAN <=>GPIB Interface
GPIB
LAN Instrument
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8065 Ethernet to GPIB
Company Network
