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While in remote mode, you can change to local mode operation by pressing the
front panel LOCAL button, by sending the GPIB GTL (Go to Local) command, or
by negating the GPIB REN (Remote Enable) line. You can disable the LOCAL
button by enabling the GPIB Local Lockout (LLO) condition. For an example of
how to use LLO, see "Setting Local Lockout".
To return to remote mode, ensure that the REN line is asserted and then send any
valid GPIB or device-dependent command. Since the remote mode output settings
may be different from the local mode settings, the output is programmed to protect
the load by turning off when you toggle from local to remote mode during a
session. Check your remote settings and then send OUT ON to restore the output.
Local Mode
In local mode operation, you set the voltage and current output levels and the OVP
trip level with controls located on the front panel. Refer to the operating manual for
Operation
a description of the functions available at the front panel.
While in local mode operation, you can change power supply control to remote
mode by ensuring that the GPIB REN line is asserted and then sending any
software command to get into remote mode and the OUT ON command to restore
the output. You can return to local mode by pressing the front panel LOCAL
button, unless Local Lockout is in effect. If LLO is in effect, use the GPIB GTL
command to send the power supply into local mode, or negate the REN line to turn
off LLO and return the power supply to local mode.
Example:
Setting Local
Use the GPIB Local Lockout command to disable the front panel LOCAL switch.
Lockout
With LLO in effect, you cannot return to local control by pressing the front panel
LOCAL switch. You can still return to local mode by sending the GTL command.
To turn off LLO and return the power supply to local mode, negate the REN line.
The LLO condition can only be removed by negating the asserted REN line.
Example:
ibfind "devname"
ibloc
ibwrt"id?"
ibloc
ibfind GPIB0
ibsic
ibsre1
Installation and Configuration
Address the unit (devname or device name as
configured originally with ibconf).
Set unit to local mode.
Any message to the unit now puts it back to
remote mode.
Toggle back to local mode.
Address the computer controller
Put the controller in charge by sending an Interface
Clear.
Assert the Remote Enable line.
Remote/Local Operation
23
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