Problems With Mxibus Cable - National Instruments VXI-AT2022 Getting Started

Appendix B

Problems with MXIbus Cable

If you have verified that you do not have a conflict with any of the AT-MXI configuration
settings, your problem might be with the MXIbus cables in your system.
The following symptoms can indicate a problem with the MXIbus cable.
• resman finds the AT-MXI board at Logical Address 0 but does not detect the VXI/VME
chassis.
• resman previously worked, but now produces errors.
Perform the following checks to determine the problem with your MXIbus cables.
1. Check the pins on your cable connectors. Sometimes the pins get bent and fail to provide the
proper electrical connection.
2. Make sure the each end of the MXIbus cable is plugged into the proper connector. Certain
MXIbus cables have a single-point connector on one end and a daisy-chain connector on the
other end. With these cables, you must connect the single-point connector to the MXIbus
device that is closer in the MXIbus chain to the MXIbus System Controller. The MXIbus
System Controller determines who gains control of the MXIbus. By default, the AT-MXI is
the MXIbus System Controller (set by the Bus Configuration Editor) and the VXI-MXI is not
the System Controller (set by an onboard slide switch). If you are having problems, check
that the AT-MXI and the VXI-MXI are set accordingly.
3. If the cabling problem is not apparent, try another MXIbus cable if you have one available.
If this solves the problem, contact National Instruments for repair information.
© National Instruments Corporation B-5 VXI-AT2022/NI-VXI SCO UNIX Getting Started
Troubleshooting