13-6 Remote Operations
3. Connect any additional connectors from other instruments as required for your
application.
4. Make sure the other end of the cable is properly connected to the controller. Most con-
trollers are equipped with an IEEE-488 style connector, but a few may require a differ-
ent type of connecting cable. See your controller's instruction manual for information
about properly connecting to the IEEE-488 bus.
NOTE You can only have 15 devices connected to a IEEE-488 bus, including the controller.
The maximum cable length is either 20 meters or two meters multiplied by the num-
ber of devices, whichever is less. Not observing these limits may cause erratic bus
operation.
Primary address
The SourceMeter ships from the factory with a GPIB primary address of 24. When the unit
powers up, it momentarily displays the primary address. You can set the address to a value from
0 to 30, but do not assign the same address to another device or to a controller that is on the
same GPIB bus (controller addresses are usually 0 or 21).
The primary address can be checked and/or changed from the COMMUNICATIONS/GPIB
option of the Main Menu. See Section 1, Main menu. This menu option also allows you to
select the 488.1 or SCPI protocol (see Appendix G).
General bus commands
General commands are those commands, such as DCL, that have the same general meaning
regardless of the instrument. Table 13-1 lists the general bus commands.
Table 13-1
General bus commands
Command Effect on SourceMeter
REN
IFC
LLO
GTL
DCL
SDC
GET
SPE, SPD
Goes into remote when next addressed to listen.
Goes into talker and listener idle states.
LOCAL key locked out.
Cancel remote; restore SourceMeter front panel operation.
Returns all devices to known conditions.
Returns SourceMeter to known conditions.
Initiates a trigger.
Serial polls the SourceMeter.
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