Model 8901B Service
A14U13
Pin
1
38
35
32
29
26
Display
Digit
1
2
3
4
5
6
Mnemonic
ATN ARD
AAD SRQ
RNL ATT
61.N
Display
HP-IB
Status.
Displays the status of the HP-IB lines selected by N. The display
is
in
binary. See Service Sheet 28
for
troubleshooting and a complete list of HP-IB mnemonics.
23 20
7
8
ATL
SDV
NOTE
Information within pointed brackets appears
on
the Measuring Receiver’s
display.
N=O
N=l
N=2
N=3
N=4
N=5
<Addressed
to Talk>.<Addressed
to Listen>. This function
reads
back and displays
the present state of the Talk and Listen Address flip-flops (A14U16A and
B).
For example,
if
the
display shows 1.0, the Modulation Analyzer
is
addressed to talk (and unaddressed to listen).
This means the Talk Address flip-flop
is
set (and the Listen Address flip-flop is reset).
<DAV>.<RFD><DAC>. This function reads back and displays the present state of the
three bus handshake lines. <DAV> reflects the
state
of the Data Valid bus handshake line
as being driven by the Modulation Analyzer (l=being driven; O=not being driven). Thus,
when in Listen Only, this display will always show
0
for <DAV>. The <RFD> and <DAC>
always track the bus lines Ready For Data and Data Accepted. For example,
1
for <RFD>
means line Ready For Data
is
true (high).
<ATN>.<REN>. This function reads back and displays the present state
of
the ATN
(Attention) bus control line and the
state
of the Remote Enable Flip-Flop.
A
1
for either
<ATN>
or
<REN> indicates ATN
is
true (low at the bus)
or
that the Remote Enable
Flip-Flop is set.
<SPM>.<SRQ>. This function reads back and displays the
state
of the Serial-Poll flip-flop
and the state of the SRQ bus-control line as being driven by the Modulation Analyzer is
in
serial-poll mode (SPM)
or
that
it
is presently driving the SRQ bus control line.
PI0
Port
A.
This function inputs and displays (without modifying) the
data
at
PI0
port
A
(A14U13). Leading zeros are blanked. The following table interprets the display.
PI0 Port
A
PI0
Port B. This function
is
similar
to
the function above except
PI0
port B is displayed.
The display is interpreted as shown in the table below.
PI0 Port
B
Special
Functions
8B-13
To Next Page
Loading...
