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Operation
Model 8902A
Operating Mode
T Digit
Talk and Listen
0
Talk Only
1
Talk Status Only
I *
Listen Only
0
Reading the HP-IB Address Switch and SRQ Status
L Digit
S Digit
0
1
or0
1 or 0
1 o r 0
1
or
0
1
o r 0
1
1
or
0
The HP-IB switch sets the instrument address and the Talk and Listen modes of the instrument. To
display the state of the
HP-IB
address switch and the
SRQ
Line in binary, enter
21.0SP.
This display does n o t time
out.
To
clear the instrument display, press the CLEAR key.
The format of the display is as follows;
AAAAA.TLS
where AAAAA is a five-bit binary address with leading zeros blanked and TLS represent the status
of the TON switch, LON switch and
SRQ
bus line repectively.
NOTE
I J T und L urc holh
I ,
rhc instriimcwl is
s d lo
Talk Only (Tulk Only
overrides Lislen Only
).
Ifall
A hits
arc
I
and T is I , the instriimcnt will Talk Sfafiis Only (that
is. oiitpirl the sta1ii.s hyle only).
A list of possible conditions of the TLS digits of the display is provided in the following table:
Example If 11
10.001
is the address displayed, then the HP-IB address is 1 1
1 0
in binary (that is,
14
in decimal). The
T
digit is "Off, and the L digit is "0" indicating that the instrument is set to be able
to
Talk and Listen. The
S
digit is 1 indicating that the instrument is issuing a Service Request Message.
For the same example, if the BUS ADRS key is used, Addr
=
14
will be displayed. (No information
about Talk Only, Listen Only, o r
SRQ
is displayed.)
Setting the HP-IB Address The Measuring Receiver's talk and listen addresses are switch selectable
as described in paragraph 2-7. Refer to Table
2-2
for a comprehensive listing of all valid
HP-IB
address codes.
Updating the HP-I8 Address Display The
HP-IB
address display
is
continuously updated. When
the switch setting is changed, the result is immediately visible on the display.
3-34
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