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