TM 5-6675-323-14
Table 3-26. HP-IB ERROR DISPLAYS AND POSSIBLE CAUSES - Cont
P o s s i b l e Causes
Display or Printout
SERVICE REQUEST FAILURES
( 1 ) Failure of control bus latch ROM U1
" INTERFACE REQUESTED SERVICE
BUT "SRQ IN STATUS BYTE" IS
or I/0 register selector on PCA A2.
NOT SET
(2) Failure of microprocessor.
S a m e as items (1) and (2) above.
" INTERFACE DOES NOT REQUEST
CANNOT CLEAR "SRQ"
SERVICE.
S a m e as items (1) and (2) above.
"INTERFACE INCORRECTLY
RESPONDED TO SERIAL POLL.
CANNOT CLEAR "SRQ"
INTERRUPT TEST FAILURES
(1)
Failure of interrupt logic, micro-
"IUT WAS ENABLED TO INTERRUPT
processor, or control bus latch on
ON SERVICE REQUEST, BUT NO
PCA A2 .
INTERRUPT OCCURRED"
( 2 ) Failure of output data latch on PCA
A2 .
( 1 ) Same as items (1) and (2) above.
"IUT WAS ENABLED TO INTERRUPT
INTERRUPT ON BECOMING ACTIVE
( 2 ) Failure of computer command register
CONTROLLER, BUT NO INTERRUPT
or interrupt logic on PCA A1.
OCCURRED"
S a m e as items (1) and (2) above.
"IUT WAS ENABLED TO INTERRUPT
INTERRUPT ON BECOMING ACTIVE
TALKER, BUT NO INTERRUPT
OCCURRED"
Failure of interrupt logic, microproces-
"IUT WAS ENABLED TO INTERRUPT
sor, control bus latch, or data input
INTERRUPT ON BECOMING ACTIVE
multiplexer on PCA A2.
LISTENER, BUT NO INTERRUPT
OCCURRED"
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