User`s guide

3-3

Programming over GPIB

Interface Capabilities

The interface capabilities of the oscilloscope, as defined by IEEE 488.1, are SH1,

AH1, T5, L4, SR1, RL1, PP0, DC1, DT1, C0, and E2.

Command and Data Concepts

The interface has two modes of operation:

• command mode

•data mode

The bus is in the command mode when the ATN line is true. The command mode

is used to send talk and listen addresses and various bus commands, such as a

group execute trigger (GET).

The bus is in the data mode when the ATN line is false. The data mode is used

to convey device-dependent messages across the bus. The device-dependent

messages include all of the instrument commands and responses.