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EX II 3000SP Controller Communications 27
3M Touch Systems Proprietary Information
To terminate Format Raw, issue a Reset command. The controller may
return several bytes of data between the time you issue a Reset command
and when the controller receives it. You can either scan the data stream for
the Reset acknowledgment, or you can ignore the response to the first Reset
command and then issue a second Reset after approximately 10 seconds has
passed.
Use the Format Raw command for diagnostics. Use Format Tablet for
standard touch screen operation.
Response: <SOH>0<CR> Positive response
After the controller is in Format Raw mode, the controller returns a
response in the following format:
<41-byte-packet><41-byte-packet>...<41-byte-packet>...
Table 6 General Packet Formats
Byte Bits 0 – 7
1 b0 – b6: Reserved
b7: Synchronization bit (Always 1)
2-6 I component of upper left (UL) corner
7-11 Q component of upper left (UL) corner
12-16 I component of upper right (UR) corner
17-21 Q component of upper right (UR) corner
22-26 I component of lower left (LL) corner
27-31 Q component of lower left (LL) corner
32-36 I component of lower right (LR) corner
37-41 Q component of lower right (LR) corner
Table 7 I/Q Corner Components
Byte Bits 0 – 7
N b0 – b6: bits 0-6 of respective I/Q corner data
b7: Always 0
N+1 b0 – b6: bits 7-13 of respective I/Q corner data
b7: Always 0
N+2 b0 – b6: bits 14-20 of respective I/Q corner data
b7: Always 0
N+3 b0 – b6: bits 21-27 of respective I/Q corner data
b7: Always 0
N+4 b0 – b3: bits 28-31 of respective I/Q corner data
b4 – b7: Always 0