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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.
P I 0 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.
P I 0 Port B
Special
Functions
8B-13
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