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78 34980A User’s Guide
2 Features and Functions
• Dot-notation addresses (“nnn.nnn.nnn.nnn” where “nnn” is a byte
value) must be expressed with care, as most web software on the
computer will interpret byte values with leading zeros as octal numbers.
For example, “255.255.020.011” is actually equivalent to decimal
“255.255.16.9” not “255.255.20.11” because “.020” is interpreted as “16”
expressed in octal, and “.011” as “9”. To avoid confusion, use only
decimal expressions of byte values (0 to 255), with no leading zeros.
For example, the 34980A assumes that all dot-notation addresses are
expressed as decimal byte values and strips all leading zeros from these
byte values. Thus, attempting to set an IP address of “255.255.020.011”
will become “255.255.20.11” (a purely decimal expression). Be sure to
enter the exact expression, “255.255.20.11”, in your computer web
software to address the instrument. Do not use “255.255.020.011” — the
computer will interpret this address differently due to the leading zeros.
• If you are planning to use a static IP address on a Corporate LAN,
contact your network administrator to obtain a fixed IP address to be
used exclusively for your instrument.
• The IP address is stored in non-volatile memory, and does not change
when power has been off, after a Factory Reset (
*RST command), or
after an Instrument Preset (
SYSTem:PRESet command).
Front Panel Operation:
Utility > REMOTE I/O > LAN > LAN SETTINGS > MODIFY > DHCP OFF >
AUTO IP OFF > IP ADDRESS
Remote Interface Operation:
SYSTem:COMMunicate:LAN:IPADdress <address>
Auto-IP
The Auto-IP standard automatically assigns an IP address to the 34980A
when on a network that does not have DHCP servers.
If you change the Auto- IP configuration, you must cycle power on the
34980A to activate the new setting.
• Auto-IP allocates IP addresses from the link-local address range
(169.254.xxx.xxx).
• From the factory, the Auto-IP setting is enabled.
• The Auto-IP setting is stored in non- volatile memory, and does not
change when power has been off, after a Factory Reset (
*RST
command), or after an Instrument Preset (SYSTem:PRESet command).