Carrol Touch TouchSystems CarrollTouch Prog, Programmer'S Manual

Page: 128 / 274

CARROLL TOUCH Appendix A - Smart-Frame Protocol Command Reference
Touch System Programmer’s Guide A-19
Get_Failed_Beam_Report (36H) (6)
Command Description
When the host sends the Get_Failed_Beam_Report (36H) command,
the touch system analyzes the beams that are listed in the failed beam
table at the time the command is processed. It does not examine any
beams other than those listed in the table and does not add beams to or
remove beams from the table.
When a beam fails, the touch system firmware attempts to determine
which opto-device is not functioning, if the touch system hardware
allows this. If the touch system hardware does not allow such an
analysis, the status indicator is set to “firmware could not determine
problem” (0) for all failed beams specified in the Failed Beam Report.
Report Format
The Failed Beam Report has the following format:
FA Nx Xa, Ta, ..., Xn, Tn Ny Ya, Sa, ..., Yn, Sn
FF
FA
= Start of Failed Beam Report.
Nx
= Number of x-beam reports to follow.
Xa, ..., Xn
= X-beam numbers.
Ta, ..., Tn
= Status of failed x-beams.
0
= Firmware could not determine problem.
1 = Failed phototransistor.
2 = Failed LED.
3 = Failed phototransistor and LED.
4 = Individual components appear to work
separately, but not together. Failure cannot be
isolated.
Ny
= Number of y-beam reports to follow.
Ya, ..., Yn
= Y-beam numbers.