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TABLE 5-2
Symptom
String data transfer
fails Continued
Polarity setting wrong Polarity command
or changed
Unit fails to respond
correctly to National
Instruments GPIB
Controller Card
TROUBLESHOOTING GUIDE CONT'D
Possible
Fault
No talk data
Talk handshake on
when not needed for
static data
Wrong Format
Controller did not
receive line feed
(Unit hangs with
TALK LED on)
Dual Address Mode
No talk data
out of sequence
REN not asserted
5-7
Action or Check
EDR flip-flop not set
Set talk handshake off
Selected data format
Inserting commas or
terminators in HEX or 4833
between data bytes.
Use bus analyzer to check
outputted data
Set controller to recognize
shorter strings to see if any
data outputted.
EDR missing with Talk
handshake enabled.
Talk address not recognized
unless unit is UNTALKed
between messages in Dual
Address Mode. Send UNT
command after reading data
Assign inputs or outputs
before polarity command
Check Bus REN signal
Add ibsre command to
program to set the REN line.
5
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