Warm Up Supply; Monitor Out; Interface; Usb - Lakeshore 335 User Manual

4.6 Interface

4.6.1 USB

4.6.2 IEEE-488

4.7 Locking and
Unlocking the
Keypad
The voltage output is designed to provide up to 1 W into a 100 ) heater. The output is cur-
rent limited to slightly over 100 mA, and therefore, a heater value less than 100 ) can
drive the output into current limit. This condition will not damage the output, but it can
result in discontinuous temperature control.

4.5.2.1 Warm Up Supply

Warm Up Supply mode is designed for controlling an external power supply used for
rapidly increasing the temperature in the controlled system, for example, to bring a
system to room temperature in order to change samples. Refer to section 5.5 for more
information on warm up supply operation. Refer to section 3.7.5 for the procedure to
install an external power supply for warm up supply mode.
Menu Navigation:
Output SetupQOutput 2Q VoltageQ WarmUp Supply
Interface Command: OUTMODE

4.5.2.2 Monitor Out

Refer to section 5.6 for more information on Monitor Out mode.
Menu Navigation:
Output SetupQOutput 2Q VoltageQ Monitor Out
Interface Command: OUTMODE
The Model 335 has two computer interfaces: IEEE-488, and USB. Only one of these
interfaces can be active at any time. Use the Interface key to configure the parame-
ters related to the selected interface.
The USB interface is provided as a convenient way to connect to most modern com-
puters, as a USB interface is provided on nearly all new PCs as of the writing of this
manual. The Model 335 USB driver, which must be installed before using the inter-
face (section 6.3.3), creates a virtual serial com port, which can be used in the same
way as a traditional serial com port. Refer to Chapter 6 for details on computer inter-
face operation.
An IEEE 488 (GPIB) interface is provided for compatibility with legacy systems. Refer
to Chapter 6 for details on computer interface operation.

4.6.2.1 Remote/Local

Local refers to operating the Model 335 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)
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.
4.6 Interface 65
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