1256E User Manual
Using the Front-Panel Controls 3-20
Racal Instruments
©
2002
(RS-232 is active)
<Local Mode
At this time, the knob and all keys are disabled, and the
1256 receives commands from the remote interface
only. The user may restore local control only by issuing
a
KLOCK OFF
command. The display then returns to
the state that it was in when the 1256 entered lockout
mode. Manual control is also restored if the user cycles
the power to the 1256.
•
Manual lockout:
When the 1256 receives the
command
SYST:KLOCK ON
(local lockout) via the
Ethernet, RS-232, or GPIB interface, it displays the
following message (assuming that the RS-232 port is
selected):
*REMOTE OPERATION*
(RS-232 is active)
Local Mode Lockout
In this case, all front-panel controls are disabled. The
only way to restore local (front-panel) control is to send
the command
SYST:KLOCK OFF
via the remote
(Ethernet, RS-232, or GPIB) interface. For details on
sending the commands
SYST:KLOCK ON
and
SYST:KLOCK OFF
, refer to
Chapter 4: COMPUTER
INTERFACES
.
The automatic lockout may be enabled or disabled via the front-
panel controls (if local mode is currently active). When lockout is
enabled, the automatic lockout mode is activated when the 1256
receives any command via a remote interface. When lockout is
disabled, the front-panel controls remain active even after the
1256 receives a command (other than
SYST:KLOCK ON
) via the
remote interface. However, the secure lockout mode becomes
active if the 1256 receives a
SYST:KLOCK ON
command,
regardless of whether the automatic lockout is enabled or
disabled.
To enable or disable the automatic local lockout, proceed as
follows:
1. Press the top key next to the display. Rotate the knob until
the top line reads:
>-----SETTINGS-----<
2. Select line 2 (next to the top line) by pressing the second
