GPIB
370B User Manual 4-3
System Control. While running a program, the controller assigns tasks to
instruments in the system, coordinates communication, handles error conditions,
and monitors the system’s progress.
This instrument control task can be further divided into five functions:
Addressing instruments
Sending commands
Transmitting and receiving data
Handling interrupts
Monitoring device status
Each of these system control functions are explained below.
Addressing Instruments. The controller selects an instrument by addressing it.
Each instrument on a bus is assigned a unique primary address in the range 0
through 30. The controller uses this address to set an instrument to talk or listen.
Sending Data and Commands. Device-dependent messages carry commands and
data from the controller to the 370B and return instrument status information and
measurement data. The ATN line (pin 11 of the GPIB) is asserted while interface
messages are sent to distinguish them from device-dependent messages. (see
Figure 4–1).
B
Figure 4-1: GPIB messages
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General