Agilent Technologies 4294A Service Manual Page 28

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28 Chapter 2
Remote Control, Overview
GPIB Remote Control System, Overview
The system size you can set up
You can connect up to 15 devices with a single GPIB system.
The length of a cable that connects one device with another must not be more than 4
meters. The total length of connection cables used in a single GPIB system should not
be more than 2 meters times the number of devices (counting the controller as one
device). You cannot set up a system makeup in which the total cable length exceeds 20
meters.
Limit the number of connectors attached to a single device to four. Attaching five or
more connectors exerts excessive force on them and may cause failure.
Star, linear, and combinational cable configurations are allowed. You must not use a
loop configuration.
Controller
A device that can permit talking (outputting data) and listening (receiving data) is called a
controller, as opposed to a GPIB device.
The active controller, if connected to two or more controllers, can control other devices on
the bus. Only one controller among multiple controllers can be active at a given time. The
active controller can pass control to another controller by use of the PASS CONTROL
command.
When the power of the system controller is turned on, it becomes the active controller.
When another controller is active, the system controller can execute the
“ABORT
<select code>” command at any time so that it becomes the active controller.
Device selector
GPIB device control is carried out by receiving commands from the active controller. The
active controller can operate the device selector to select a target device.
HP Instrument BASIC is connected to the Agilent 4294A by its interface installed in the
4294A. The interface select code of the built-in interface is set to 8 so as to distinguish it
from the external select code 7.
Since this unit alone is connected to the built-in interface, any address from “00” through
“30” may be used to specify the analyzer used with the internal connection from
Instrument BASIC. In this unit, address “00” is used so that the device selector turns to
“800”.
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