Agilent Technologies 54502A Manuale di Servizio Scaricare il pdf (Pagina 28)

User Interface The front-panel user interface of the HP 1650B/51B consists of front-panel keys,

the KNOB, and display. The interface allows configuration of each analyzer

(machine) within the logic analyzer. It also displays acquired data and

measurement results.

Use the front-panel interface with the following process:

select the desired menu with menu keys

place the cursor on the desired field within the menu by rotating the KNOB

display the field options or current data by pressing the SELECT key

select the desired option by rotating the KNOB or entering new data by using

the KNOB or the keypad

Start and stop data acquisition by using the RUN and STOP keys

HP-IB

Interfacing

The Hewlett-Packard Interface Bus (HP-IB) is Hewlett-Packard’s implementation

of IEEE Standard 488-1978, "Standard Digital Interface for Programming

Instrumentation." HP-IB is a carefully defined interface that simplifies the

integration of various instruments and computers into systems. The interface

makes it possible to transfer messages between two or more HP-IB compatible

devices. HP-IB is a parallel bus of 16 active signal lines divided into three

functional groups according to function.

Eight signal lines, called data lines, are in the first functional group. The data lines

are used to transmit data in coded messages. These messages are used to program

the instrument function, transfer measurement data, and coordinate instrument

operation. Input and output of all messages, in bit parallel-byte serial form, are

also transferred on the data lines. A 7-bit ASCII code normally represents each

piece of data.

Data is transferred by means of an interlocking "Handshake" technique which

permits data transfer (asynchronously) at the rate of the slowest active device used

in that transfer. The data byte control lines coordinate the handshaking and form

the second functional group.

The remaining five general interface management lines (third functional group)

are used to manage the devices connected to the HP-IB. This includes activating

all connected devices at once, clearing the interface, and other operations.

The HP-IB connector and on the rear panel are shown in figure 2-3.

HP 1650B/1651B Installation

Service Manual 2-5

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Agilent Technologies 54502A Manuale di Servizio Pagina 28