13-6 Remote Operations Models 2500 and 2502 User’s Manual
NOTE You can only have 15 devices connected to an IEEE-488 bus, including the con-
troller. The maximum cable length is either 20 meters or two meters multiplied
by the number of devices, whichever is less. Not observing these limits may
cause erratic bus operation.
Primary address
The Model 2500 ships from the factory with a GPIB primary address of 25. 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 (Appendix G).
General bus commands
General commands are those commands, such as DCL, that have the same general mean-
ing regardless of the instrument. Table 13-1 lists the general bus commands.
Table 13-1
General bus commands
Command Effect on Model 2500
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 Model 2500 front panel operation.
Returns all devices to known conditions.
Returns Model 2500 to known conditions.
Initiates a trigger.
Serial polls the Model 2500.
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