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3M™ MicroTouch™ Controller EX Dual Mode Reference Guide
This request provides a means for reading the configuration parameters. The request uses
parameter numbers to determine what data is being requested and where that data is
located.
Table 18. Read Parameter Request
Offset
0
1
2
4
6
The direction bit in bmRequestType has been set to 1 (device-to-host) to return the
contents of the requested parameter.
The byte bRequest is set to 16 to indicate that this is the Read Parameter request.
The wValue field is set to the number of the parameter being requested.
This request does not use the wIndex field. This field should be set to zero to ensure
future compatibility.
The wLength field is the number of bytes being sent by the device to the host. The data is
returned to the host in the format of the Parameter Data report, which has a 3-byte header,
so 3 must be added to the number of parameter bytes desired. The following table lists
the parameters currently supported and the appropriate settings for the request fields.
Field
bmRequestType
bRequest
wValue
wIndex
wLength
3M Touch Systems, Inc. Proprietary Information – TSD-40848A
Size
Value
1
11000000
1
16
2
0xXXXX
2
0x0000
2
0xXXXX
Description
Characteristics
Command number
Parameter number
Not used
Length of Parameter Data report
27
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