Lakeshore 336, User Manual

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4.6.2 Ethernet 71
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4.6.2 Ethernet The Ethernet interface is provided to allow the Model 336 to connect to a computer
network. A direct connection to a PC can also be achieved using a cross-over Ethernet
cable. The advantages of using the Ethernet interface include the ability to communi-
cate directly with the Model 336 from any PC on the same local network, and even
from around the world via the internet. Refer to section 6.4.1 for details on Ethernet
configuration.
Menu Navigation:
Interface
Q
Enabled
Q
Ethernet
4.6.3 IEEE-488 An IEEE 488 (GPIB) interface is provided for compatibility with legacy systems. Refer
to Chapter 6 for details on computer interface operation.
Menu Navigation:
Interface
Q
Enabled
Q
IEEE-488
4.6.3.1 Remote/Local
Local refers to operating the Model 336 from the front panel. Remote refers to oper-
ating the controller via the IEEE 488 Interface. The keypad is disabled during remote
operation, except for the
Remote/Local key and the All Off key. When in remote mode,
the Remote front panel LED will be illuminated. When in local mode, the Remote LED
will not be illuminated.
Menu Navigation:
Remote/Local (LED On = Remote mode, LED Off = Local mode)
4.7 Locking and
Unlocking the
Keypad
The keypad lock feature prevents accidental changes to parameter values. When the
keypad is locked, some parameter values may be viewed, but most cannot be changed
from the front panel. All Off is the only keypad function that remains active when the
keypad is locked.
A three-digit keypad lock code locks and unlocks the keypad. The factory default code
is 123. The code can be changed only through the computer interface. If instrument
parameters are reset to default values, the lock code resets also. The instrument can-
not reset from the front panel with the keypad locked.
To lock the keypad, press and hold Enter for 5 s. Use the numeric keypad to enter the
three-digit lock code. If the lock code is accepted, *** Keypad Locked *** will be dis-
played for 3 s, and the display will return to normal. Changes attempted to any
parameters result in a brief display of the *** Keypad Locked *** message.
To unlock the keypad, press and hold Enter for 5 s. Use the numeric keypad to enter
the three-digit lock code. If the lock code is accepted, *** Keypad Unlocked *** will be
displayed for 3 s and the display will return to normal. All Model 336 parameters are
now accessible.