User and Programming Manual
78
XDS
Series
9.7 Trouble Shooting - IEEE-488 / GPIB
This section provides guidelines for resolving communication problems that may occur when using
the power supply with or without the XDSGUI software with a IEEE-488 / GPIB interface.
Symptoms:
1. Unable to verify connection to the power supply through IEEE-488 interface. Time-out occurs any
time an attempt is made to verify connection.
Things to check first:
1. Is the interface option set to use the IEEE-488 interface instead of the RS232C interface? The
DIP switch on the right side panel of the power supply is used to select the desired interface
mode. Refer to section 0. If the GPIB option (option -IF) was ordered, it should be set this way
from the factory but may have been changed after shipment).
2. Does the bus address selected in the System, Interface dialog match the address set using the
DIP switches on the power supply. The GPIB address selected must match the settings on the
DIP switch. If changes are made to the DIP switch setting, the power supply must be cycled off
and on to have the new settings take effect.
3. Did you connect the cable in correctly and are both ends of the GPIB cable securely tied down?
Resolution for Symptom 1
When using a fast IEEE-488 bus controller, the power supply's IEEE-488 interface may not
handshake fast enough to satisfy the controllers timing requirement. If this is the case, a time-out will
result any time a command is sent to the power supply. To rectify this situation, the IEEE-488
controller must be set to use delayed bus timing. For National Instruments GPIB controller cards
running under Windows™, this can be done from the device manager.
Select the GPIB interface and click on the NI-488.2M Settings tab. An Advanced button at the bottom
of the screen will provide access to the Bus Timing parameter. Try settng this value to 500 nsec or
2
µ
sec to operate with the power supply's
GPIB interface.
Figure 9-8: NI PCI-GPIB Advanced
Settings Dialog
Test Sequence Program Directory Files
Figure 9-7: NI PCI-GPIB Settings
Содержание XDS 100-100
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