Chapter 3
VXI Configuration Utility
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National Instruments Corporation
3-7
Protocol Register
This field specifies the contents of the Protocol register, indicating which
protocols the device supports. This field is meaningful only when the
VXIpc controller is configured as a message-based device. The default
value is 0xFF0 (Commander, Signal Register, Master).
Read Protocol Response
This field specifies the response value to a
Read Protocol
command
received by the VXIpc controller from the Resource Manager (if the VXIpc
is
not
the Resource Manager in your system). This field is meaningful only
when the VXIpc is configured as a message-based device. The default
value is 0x8448 (Response Generation, Event Generation, Programmable
Handler, Word Serial Trigger, Instrument, Extended Longword Serial,
Longword Serial).
Bus Configuration Editor
Use the Bus Configuration Editor to configure VXI bus settings, PCI bus
settings, and bus arbitration settings for the VXIpc controller.
VXI Bus Timeout
The Bus Timeout (BTO) is a watchdog timer for transfers on the VXIbus.
After the specified amount of time has elapsed, the BTO circuitry
terminates a VXIbus cycle if no slave has responded. This feature is
applicable only if the VXIpc controller you are configuring is a VXI Slot 0
device. You should disable the BTO of any other non-Slot 0 devices
residing in the mainframe.
The lowest value in the allowable range is 15
µ
s and the highest is 256 ms.
The default value is 500
µ
s.
Automatic VXIbus Retry Protocol
When the
Enable Auto Retry protocol
option is active, the VXIpc
controller can recognize and send the VXIbus retry protocol. If you disable
this option, a retry is mapped to a bus error response. By default this option
is enabled.
