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Appendix C: Interface Specification
Interface Messages
C-2
H Listener (L). Allows a device to receive device-dependent data over the
interface. This capability exists only when the device is addressed to listen.
This function uses a one-byte address.
H Talker (T). Allows a device to send device-dependent data over the interface.
This capability exists only when the device is addressed to talk. The function
uses a one-byte address.
H Device Clear (DC). Allows a device to be cleared or initialized, either
individually or as part of a group of devices.
H Remote/Local (RL). Allows a device to select between two sources for
operating control. This function determines whether input information from
the front panel controls (local) or GPIB commands (remote) control the data
generator.
H Service Request (SR). Allows a device to request service from the controller.
H Controller (C). Allows a device with the capability to send the device
address, universal commands, and addressed commands to other device over
the interface to do so.
H Electrical Interface (E) Identifies the type of the electrical interface. The
notation E1 indicates the electrical interface uses open collector drivers,
while E2 indicates the electrical interface uses three-state drivers.
Table C–2 lists the GPIB Universal and Addressed commands that the 3026
Realtime Spectrum Analyzer implements. A brief description of each function
follows the table.
Table C-2: GPIB interface messages
Interface message
Device Clear (DC)
Local Lockout (LLO)
Serial Poll Disable (SPD)
Serial Poll Enable (SPE)
Parallel Poll Unconfigure (PPU)
Go To Local (GTL)
Selected Device Clear (SDC)
Group Execute Trigger (GET)
Implemented
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
3026 Programmer Manual
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