Error Flags And Codes; Missing And Disabled Transformations - Northern Digital Polaris Vicra User Manual

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Error Flags and Codes

This chapter lists error flags that the Polaris Vicra System may return, and what each one means. It

also lists the LED and audio indications output by the Position Sensor.

5.1

Normally, the Polaris Vicra System reports a position, orientation, and error value for every

transformation. If the system cannot return a transformation, it will report the tool as MISSING or

DISABLED.

Missing Transformations

The system reports a tool as MISSING if it cannot calculate a transformation for the tool. The

system may be unable to calculate a transformation if:

•

the system cannot detect the minimum number of markers

•

less than the minimum number of markers are inside the characterized measurement

volume. By default, the Polaris Vicra System only reports the transformation of markers and

tools inside the characterized measurement volume. You can tell the Polaris Vicra System to

report the positions of markers outside the characterized measurement volume, using reply

option 0x0800 with the TX or BX command. See the "Polaris Application Program

Interface Guide" for details. See

this parameter.

•

less than the minimum number of markers are within the maximum marker angle or the

maximum 3D error

•

the spread parameters are not satisfied

•

there is a system error (described on page 49)

Disabled Transformations

The system reports a tool as DISABLED if the port handle corresponding to the tool was not

enabled, has been disabled, or is unoccupied. A port handle is unoccupied if it has been allocated,

but you have not yet associated a tool definition file with that port handle. See the "Polaris

Application Program Interface Guide" for more details on port handles.

"Tool Tracking Parameters" on page 31

for a description of

Polaris Vicra User Guide - Revision 2

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