104 34980A User’s Guide
2 Features and Functions
Front Panel Operation:
Utility > REMOTE I/O > LAN > LAN SETTINGS > MODIFY > DHCP OFF > AUTO IP
Remote Interface Operation:
SYSTem:COMMunicate:LAN:AUTOip (OFF|ON}
Subnet Mask
The instrument uses the Subnet Mask to determine if a client IP address
is on the same local subnet. When a client IP address is on a different
subnet, all packets must be sent to the Default Gateway. Contact your
network administrator to determine if subnetting is being used and for the
correct Subnet Mask.
If you change the Subnet Mask, you must cycle power on the 34980A to
activate the setting.
• The default Subnet Mask for the 34980A is “255.255.0.0”.
• If DHCP is enabled, the specified Subnet Mask is not used. However,
if the DHCP server fails to assign a valid IP address, the currently
configured Subnet Mask will be used.
• 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 a Subnet Mask 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
the computer will interpret this address differently due to the leading
zeros.
• A value of “0.0.0.0” or “255.255.255.255” indicates that subnetting is not
being used.
• The Subnet Mask 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).
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