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8.4 Notes of the GP-IB
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Symptom Cause/Treatment
The GP-IB has stopped working
completely.
Are the cables properly connected?
Is the device address for the 3237/38/39 set correctly?
Do some other devices have the same GP-IB address?
Are all the devices powered on?
After transmission on the GP-IB
bus, the keys on the 3237/38/39
freeze up and have no effect.
Press the
LOCAL
on the 3237/38/39 to release the remote
state.
Has a LLO (Local Lock Out) command been transmitted?
Transmit a GTL (Go To Local) command to put the
3237/38/39 into the local state.
When attempting to read data using
a Basic INPUT@(ENTER)
statement, the GP-IB bus hangs.
Be sure to transmit one query before each INPUT@ (ENTER)
statement.
Have any of these transmitted queries resulted in an error?
Although a command has been
transmitted, nothing has happened.
Using ∗ESR? command, inspect the contents of the standard
event status register, and check what type of error has occurred.
Sending several queries, produce
only one response.
Has an error occurred?
Read the response whenever transmitting each query. When you
want to read them in all at once, try putting them all on one line
using the message separator.
Have ∗IDN? query been used?
The service requests are not
generated sometimes.
Have the service request enable register and the standard event
status enable register been set correctly?
Clear the standard event register at the end of RQS processing
subroutines with ∗CLS command. Unless the bit of the event
has been cleared once, no service request would have generated
in the same event.
The response message to a query
differs from the display of the
3237/38/39.
The response message is produced at the instant that the
3237/38/39 receives the query, and there is a possibility that it
may not agree with the display.
8.4 Notes of the GP-IB
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