10-8 Remote Operations Model 2700 Multimeter/Switch System User’s Manual
General bus commands
General commands are those commands, such as DCL, that have the same general mean-
ing regardless of the instrument. Table 10-1 lists the general bus commands.
REN (remote enable)
The remote enable command is sent to the Model 2700 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.
The Model 2700 must be in remote in order to use the following commands to trigger and
acquire readings:
• INITiate and then FETCh?
• READ?
• MEASure?
IFC (interface clear)
The IFC command is sent by the controller to place the Model 2700 in the local, talker,
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 these states.
Note that this command does not affect the status of the instrument. Settings, data, and
event registers are not changed.
With auto output off enabled (SOURce1:CLEar:AUTO ON), the output will remain on if
operation is terminated before the output has a chance to automatically turn off.
To send the IFC command, the controller need only set the IFC line true for a minimum of
100µs.
Table 10-1
General bus commands
Command Effect on Model 2700
REN Goes into effect when next addressed to listen.
IFC Goes into talker and listener idle states.
LLO LOCAL key locked out.
GTL Cancel remote; restore Model 2700 front panel operation.
Cancel remote; restore front panel operation for all devices.
DCL Returns all devices to known conditions.
SDC Returns Model 2700 to known conditions.
GET Initiates a trigger.
SPE, SPD Serial polls the Model 2700.
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