Ifc(Interfaceclear); Llo(Locallockout); Gtl(Gotolocal)Andlocal; Dcl(Deviceclear) - Keithley 263 Instruction Manual

IEEE-488 PROGRAMMING
To place the Model 263 in the remote mode, the controller
must perform the following sequence:
1. Set the REN line true.
2. Address the instrument to listen.
HP-85 Progmnming Example-This sequence is automa-
tically performed by computer when the following is typed
into the keyboard.
After the END LINE key is pressed, the instmment will
be in the remote mode, as indicated by the REMOTE light.
If not, check to see that the instrument is set to the pro-
per primary address 8, and check to see that the bus con-
nections are properly made.
4.6.2 IFC (interface Clear)
The IFC command is sent by the controller to place the
Model 263 in the local, talker and listener idle states. The
unit will respond to the IFC command by cancelling front
panel TALK or LISTEN lights, if the instrument was
previously placed in one of those modes.
To send the IFC command, the controller need only set
the IFC line true for a miniium of 100rsec.
HP-85 Progr amming Example-Before demonstrating the
IFC command, turn on the TALK indicator with the
following statements:
At this point, the REMOTE and TALK lights should be
on. The IFC command can be sent by entering the follow-
ing statement into the computer:
KFClRTIO 7
After the END LINE key is pressed, the REMOTE and
TALK lights will turn off, indicating that the instrument
has gone into the talker idle state.
4.6.3 LLO (Local Lockout)
The LLO command is used to remove the instrument from
the local operating mode. After the unit receives LLO, al!
its front panel controls except POWER will be inoperative,
REN must be true for the instrument to respond to LLO.
REN must be set false to cancel LLO.
To send the LLO command, the controller must perform
the following steps:
1. Set ATN true.
2. Place 'the LLO command on the data bus.
HP-85 Programming Example-The LLO cornman d is sent
by entering the following statement:
After the END LINE key is pressed, the instrument's front
panel controls will be locked out.
4.6.4 GTL (Go To Local) and Local
The GTL command is used to take the instrument out of
the remote mode. With some instruments, GTL may also
cancel LLO. With the Model 263 however, REN must first
be placed false before LLO will be cancelled.
To send GTL, the controller must perform the following
sequence:
1. Set ATN true.
2. Address the instrument to listen.
3. Place the GTL command on the bus.
HP-85 Programming Example-Place the instrument in
the remote mode with the following statement:
F:EP,,jTE 7,X
Now send GTL with the foIlowing statement:
Ll:lcciL 7Elc:
When the END LINE key is pressed, the front panel
REMOTE indicator goes off, and the instrument goes in-
to the local mode. To cancel LLO, send the following:
LrJCAL 7
4.6.6 DCL (Device Clear)
The DCL command may be used to clear the Model 263
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