IEEE-488 Programming
5-10
NOTE
The instrument need not be in remote to be
a talker. All front panel controls (except
LOCAL and POWER) are inoperative
while the instrument is in remote. You can
restore normal front panel operation by
pressing the LOCAL key.
5.8.3 IFC (interface clear)
The IFC command is sent by the controller to place the
Model 708A in the local, talker, and listener idle states. The
unit responds to the IFC command by canceling front panel
TALK or LSTN lights, if the instrument was previously
placed in one of those states.
5.8.4 LLO (local lockout)
The LLO command is used to prevent local operation of the
instrument. After the unit receives LLO, all of its front panel
controls except POWER are inoperative.
5.8.5 GTL (go to local)
The GTL command is used to take the instrument out of the
remote state. Operation of the front panel keys will also be
restored by GTL unless LLO is in effect. To cancel LLO, you
must set REN false.
5.8.6 DCL (device clear)
The DCL command may be used to clear the Model 708A
and return it to its power-up default conditions (see Table
Table 5-8
General bus commands/BASIC statements
Command
Basic statement
Effect on Model 708A
REN
IFC
LLO
GTL
DCL
SDC
GET
PRINT #1, "REMOTE"
PRINT #1, "ABORT"
PRINT #1, "LOCAL LOCKOUT"
PRINT #1, "LOCAL 18"
PRINT #1, "CLEAR"
PRINT #1, "CLEAR 18"
PRINT #1, "TRIGGER 18"
Goes into effect when next addressed to listen.
Goes into talker and listener idle states.
LOCAL key locked out.
Cancel remote, restore front panel operation.
Return to default conditions.
Return to default conditions.
Triggers setup with GET source.
4-2). Note that the DCL command is not an addressed com-
mand, so all instruments equipped to implement DCL will do
so simultaneously. When the Model 708A receives a DCL
command, it returns to the power-up default conditions. DCL
does not affect the programmed primary address.
5.8.7 SDC (selective device clear)
The SDC command is an addressed command that performs
essentially the same function as the DCL command.
However since each device must be individually addressed,
the SDC command provides a method to clear only selected
instruments instead of clearing all instruments
simultaneously, as is the case with DCL. Any devices on the
bus that are addressed to listen are cleared. When the Model
708A receives the SDC command, it returns to the power-up
default conditions.
5.8.8 GET (group execute trigger)
GET may be used to initiate a Model 708A setup change if
the instrument is placed in the appropriate trigger source.
Refer to paragraph 5.9 for more information on triggering.
5.8.9 SPE, SPD (serial polling)
The serial polling sequence is used to obtain the Model 708A
serial poll byte. The serial poll byte contains important infor-
mation about internal functions, as described in paragraph
5.9.12. Generally, the serial polling sequence is used by the
controller to determine which of several instruments has
requested service with the SRQ line. However, the serial
polling sequence may be performed at any time to obtain the
serial poll byte from the Model 708A.
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