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2 viewing bus events – Measurement Computing Analyzer488 User Manual

Page 57

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Section 3

Front Panel Operation

3.11

3.7.2 Viewing Bus Events

Press [LISTEN]

The LISTEN LED will light

to set Listen state

Press [SLOW]

The SLOW LED will light.

to set slow handshaking

(Note that slow handshaking speed is set to 3
bytes/sec at the factory. It can be changed using
[RATE]

.)

Enter the following commands to the keyboard controller:

CMD> timeout 0
CMD> term out cr
CMD> output 00;test

SRQ

IFC

REN

ATN

EOI

LOCATION

MESSAGE

The display will show:

BUS

TAG21 55

¼

¼

BUS

UNL 3F

¼

¼

BUS

LAG00 20

¼

¼

BUS

't' 74

¼

BUS

'e' 65

¼

BUS

's' 73

¼

BUS

't' 74

¼

BUS

CR 0D

¼

¼

BUS

ACG13 0D

¼

¼

Bus events are displayed as they happen; Eight events occurred

on the bus. The ninth display shows that the controller asserted
Attention after the "test" message. ACG13 is the bus message for the
multiline command: &h0D (ASCII CR).