6-6
Return to
Section Topics
2308-900-01 Rev. A / July 2008
Section 6: GPIB Operation
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
IFC (interface clear)
The IFC command is sent by the controller to place all instruments on the bus in the local, talker,
listener idle states. The power supply responds to the IFC command by canceling TALK or LSTN
mode, if the instrument was previously placed in one of those states. Note that this command does
not affect the status of the instrument; settings, data, and event registers are not changed.
To send the IFC command, the controller must set the IFC line true for a minimum of 100µs.
LLO (local lockout)
Use the LLO command to prevent local operation of the instrument. After the unit receives LLO, all
its front-panel controls except POWER are inoperative. In this state, pressing the
LOCAL
key will
not restore control to the front panel. The GTL command restores control to the front panel.
GTL (go to local)
Use the GTL command to put a remote mode instrument into local mode. The GTL command also
restores front-panel key operation.
DCL (device clear)
Use the DCL command to clear the GPIB interface and return it to a known state. Note that the
DCL command is not an addressed command, so all instruments equipped to implement DCL will
do so simultaneously.
When the power supply receives a DCL command, it clears the input buffer and output queue,
cancels deferred commands, and clears any command that prevents the processing of any other
device command. A DCL does not affect instrument settings and stored data.
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.
GET (group execute trigger)
GET is a GPIB trigger that is used as an event to control operation. The power supply reacts to this
trigger if it is the programmed control source.
SPE, SPD (serial polling)
Use the serial polling sequence to obtain the power supply serial poll byte. The serial poll byte
contains important information about internal functions. 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 status
byte from the power supply.
Front panel aspects of GPIB operation
The following paragraphs describe aspects of the front panel and remote panel that are part of
GPIB operation, including the remote operation indicator,
LOCAL
key, and messages.
Summary of Contents for 2308
Page 2: ......
Page 12: ...This page left blank intentionally...
Page 32: ...This page left blank intentionally...
Page 106: ...This page left blank intentionally...
Page 140: ...This page left blank intentionally...
Page 208: ...This page left blank intentionally...
Page 220: ...This page left blank intentionally...