
5730A
Operators Manual
6-50
Local-to-Remote State Transitions
The 5730A Calibrator can be operated either locally from the front panel, or remotely
with remote control commands. In addition to front panel and remote control operation,
the controller can be placed in a local lockout condition at any time by remote command.
When combined, the local, remote, and lockout conditions yield four possible operating
states:
•
Local (Front-Panel Operation)
The Calibrator responds to local and remote commands, but only remote
commands that do not affect the state of the Calibrator are allowed to execute.
For example, OUT? returns the value of the Calibrator output setting and is
executable in the local state. OUT sets the output to another value but cannot be
executed in local state.
•
Local with Lockout
Local with lockout is identical to local, except the Calibrator will go into the
remote with lockout state instead of the remote state when it receives a remote
command. The local with lockout state is entered by executing the LOCKOUT
statement from an IEEE-488 controller, or by sending the LOCKOUT command
from a serial controller.
•
Remote
When the Remote Enable (REN) line is asserted and the controller addresses the
Calibrator as a listener, it enters the remote state. These conditions are met, for
example, when a GPIB controller executes the statement “OUT 10 V,
1khz;OPER”. In the remote state, display changes to:
+/- 59.0 ppm (1 year) 213 days since calibration
12/21/12 10:52am
External
Sense
OFF
External
Guard
OFF
Boost
OFF
Wideband
OFF
Setup
Menu
Operate
V
kHz
1.0000
10.00000
Auto Range 22 V
Local Control
Operating under REMOTE control.
hhp150.eps
Front panel operation is restricted to use of the power switch and the
Local
Control
selection. Touch
Local Control
or send the GTL (Go To Local)
interface message to return the Calibrator to the local state. (One way to send the
GTL interface message in some controllers is by executing the LOCAL
statement.)
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