Section 2: Installation
Series 3700A System Switch/Multimeter Reference Manual
2-14
3700AS-901-01 Rev. D/June 2018
REN
The remote enable (REN) command is sent to the Series 3700A 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 true does not place the instrument in the
remote state. You must address the instrument to listen after setting REN true before it goes into
remote operation.
IFC
The interface clear (IFC) command is sent by the controller to place the Series 3700A in the talker
idle state and the listener idle state. The instrument responds to the IFC command by canceling 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 IFC. If transfer of a response message from the instrument was
suspended by IFC, transfer of the message will resume when the instrument is addressed to talk. If
transfer of a command message to the instrument was suspended by IFC, 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.
GTL
Use the go to local (GTL) command to put a remote-mode instrument into local mode. Leaving the
remote state also restores operation of all front-panel controls.
DCL
Use the device clear (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 Series 3700A receives a DCL 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
A DCL does not affect instrument settings and stored data.
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 Series 3700A 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 does not affect instrument settings and stored data.
