Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 2: Installation
2601B-PULSE-901-01A April 2020 2-41
IFC
The interface clear (IFC) command is sent by the controller to place the 2601B-PULSE in the talker
idle state and the listener idle state. The instrument responds to the IFC command by canceling
illumination of the front-panel TALK or LSTN lights if the instrument was previously placed in one of
these states.
Transfer of command messages to the instrument and transfer of response messages from the
instrument are not interrupted by the IFC command. If transfer of a response message from the
instrument was suspended by IFC, transfer of the message resumes when the instrument is
addressed to talk. If transfer of a command message to the instrument was suspended by the IFC
command, the rest of the message can be sent when the instrument is addressed to listen.
LLO
When the instrument is in remote operation, all front-panel controls are disabled, except the LOCAL
and OUTPUT OFF keys (and the POWER switch). The local lockout (LLO) command disables the
LOCAL key, but does not affect the OUTPUT OFF switch, which cannot be disabled.
REN
The remote enable (REN) command is sent to the 2601B-PULSE by the controller to set up the
instrument for remote operation. Generally, the instrument should be placed in the remote mode
before you attempt to program it over the bus. Setting REN to true does not place the instrument in
the remote state. You must address the instrument to listen after setting REN to true before it goes
into remote operation.
SDC
The selective device clear (SDC) command is an addressed command that performs essentially the
same function as the device clear (DCL) command. However, because each device must be
individually addressed, the SDC command provides a method to clear only selected instruments,
instead of clearing all instruments simultaneously with the DCL command.
When the 2601B-PULSE receives an SDC command, it:
• Clears the input buffer, output queue, and command queue
• Cancels deferred commands
• Clears any command that prevents the processing of any other device command
An SDC call does not affect instrument settings and stored data.
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