Instrument IEEE Bus Trace Guide
Introduction
4G
4G-3
Introduction
This part of Chapter 4 documents the Instrument IEEE Bus Trace program. The program
is an integral part of the 9640A and 9640A-LPN firmware (version 2.00 and later). Its
purpose is to record GPIB bus transactions to aid in the diagnosis of GPIB remote control
issues. Bus transactions are stored in a FIFO 2 Mb buffer. As the buffer fills, newer data
pushes the oldest data out of the buffer, discarding it.
Note
Stored bus transaction data is not retained after the Instrument is powered down.
To use the trace facility, follow these steps:
1.
Set up the GPIB preferences and run the remote commands in question.
2.
When the command sequence is complete, press the
Go to Local
soft key. This will
place the instrument under local control.
3.
Press
.
4.
Press the
GPIB Preferences
soft key.
5.
From the
GPIB Personality
screen, press the GPIB Trace soft key. This will bring up
the
GPIB Trace
screen and display the contents of the trace buffer.
ead351f.bmp
GPIB Trace Screen
The field on the left contains either a
<
or
>
character to indicate the direction of the
message. The
>
character means a command directed at the instrument, and the
<
character indicates a response from the instrument.
In ASCII mode, any character that falls outside the range 32 to 127 will be displayed as
hexadecimal. For example, the new-line character is shown as <0x0A>.
The GPIB Trace Soft Keys and Menus
Buffer Navigation
The right hand soft keys marked
Trace Top
,
Trace Bottom
,
Page Up
, and
Page Down
allow the user to move up and down the trace buffer. To move one line at a time, use the
cursor keys (or the navigation wheel).
To view the beginning and end of a long line, use the
Selected Line Start
and
Selected
Line End
soft keys, (a line is considered selected when the yellow line cursor is over it).
The
cursor keys allow the user to scroll the trace display left and right one character
at a time.
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