24
SC500 USB Controller Reference Guide
3M Touch Systems Proprietary Information
POC Status – The status of the Power-on Checks. Various controller systems are
checked at power-up. If any failures in these systems are detected, a POC flag is set.
The POC status field reports the state of these flags. The POC status information is
also flashed on the controller’s LED.
Table 16. Power On Status
Bit Number
LED Flashes Description
0 1
Not
used
1
2
Program code checksum error
2 3
Not
used
3
4
Block 1 parameters invalid (using defaults)
4
5
Power-up touch screen connector voltages are out of range
5 6
Not
used
6 7
Not
used
7
8
Controller linearization data invalid
Cmd Status – The status for the last command request. This field is used to determine
whether the last request was processed successfully. It is also used to track the
progress of a multi-stage request, such as calibration. The Status Request does not
affect the contents of this field, i.e., successful/unsuccessful processing of a previous
status request does not cause the command status field to be updated.
Table 17. Command Status Field Entries
Response
Description
0
Failure in command processing
1
Command being processed
2
Stage 1 processing complete (for multi-stage commands).
3 Command
complete
4
Soft reset occurred
5
Hard reset occurred
6
Stage 2 processing complete (for multi-stage commands)
7 Not
used
Touch Status – Status information for the most recent coordinate. Information
includes whether the sensor is currently being touched.
Table 18. Power On Check Bit Fields
Bit Number
Description
0
1 if the sensor is being touched
1 Always
0
