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THE FOLLOWING TESTS ARE DONE IF THE 6034A WILL NOT LISTEN PROPERLY. THE TRANSCEIVERS, HP IB
INTERRUPT LOOP, LOAD/SHIFT PROTECTION, AND LISTEN MONITOR CIRCUITS SHOULD BE CHECKED FIRST,
THEN, ATTEMPT TO ISOLATE THE PROBLEM TO CHI, THE TRANSCEIVERS, OR ELSEWHERE. IF CHI, THE
TRANSCEIVERS, OR ELSEWHERE. IF CHI IS CORRECTLY DECODING THE LISTEN ADDRESS, A4DS1 (LISTEN)
SHOULD BE LIT ON THE A4 BOARD, EVEN IF THE FRONT-PANEL LSN LED IS NOT ON. IF THE MICROCOM¬
PUTER IS CORRECTLY DECODING THE LISTEN STATE, THE FRONT-PANEL LSN LED (A3DS18) SHOULD BE LIT.
TO TEST THE LISTEN CIRCUITS, FIRST RUN THE BASIC HANDSHAKE PROGRAM AND CHECK WAVEFORMS
AT THE LISTED LOCATIONS. IF CORRECT, THEN CHECK WAVEFORMS WITH THE SECOND PROGRAM.
8ASIC HANDSHAKE PROGRAM >
(T)
6034A IS READY TO
RECEIVE A BYTE
(2)
BYTE IS AVAILABLE ON
DIO AND EOI LINES
(3>
6034A ACCEPTS BYTE
(4)
BYTE NO LONGER AVAILABLE
(?)
6034A IS READY TO RECEIVE
ANOTHER BYTE
5TEN 5
A4U76-6
RECEIVE READY
A4U76-II
RECEIVE HANDSHAKE
A4U64-I
ADDRESSED TO LISTEN
r
If
0.2 ms/DIV
6034A IS UNLISTENED
0
'
0
ivi d
7»
" U
" ?
1
:
3
%0
0
10 SEND 7
i
MTFi LISTEN
20 OUTPUT 7 ; "
11
30 GOTO 10
40 END
A4U76-6 RECEIVE READY
A4U76-II RECEIVE HANDSHAKE
u
©
0.2 ms/DIV
HANDSHAKE WITH UNLISTEN PROGRAM
0
'
cod
7
5
?U'»"
Is
3%o
0
10 SEND 7
;
UNL MTfl Li
20 OUTPUT 7 ;"
"
30 GOTO 10
40 END
REPEAT BASIC HANDSHAKE PROGRAM TO CHECK RECEIVE HANDSHAKE MONITOR
A4U68-II
A4U68-8
~r
f» 50 ns
F 0.2 ms/DIV
A4U68-8 GOES LOW WHEN BYTE IS
AVAILABLE FOR 6034A TO READ IN.
A4U68-8 RETURNS HIGH WHEN RESET
BY HP-IB INTERRUPT LOOP.
Figure 5-41.
Listen Handshake/Receive Monitor Circuit
5-58
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