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Chapter 4: Programming 4-3
Table 1: NCR Proprietary HID Usages
Usage Hexadecimal Value
HID_USAGE_PAGE_NCR_MISC 0xFF8F
KEYLOCK 0x01
KEYBOARD_TONE 0x02
KEYBOARD_MAP 0x03
KEY_CLICK_INFO 0x11
ERROR_TONE 0x12
TONE FREQUENCY 0x21
TONE DURATION 0x22
TONE VOLUME 0x23
KEY_MATRIX_USAGE 0x31
The report descriptors as emitted by the HID device should be
consulted as the authority for the format of the reports. Software
should access fields using report descriptor-based techniques and
should not assume that all revisions of the product use identical report
descriptors. The following provides interpretation information for
these reports.
Keylock hardware HID interface: The keylock reports its
positions as HID buttons. The positions are assigned as follows:
• Button 1 = Ex
• Button 2 = L
• Button 3 = R
• Button 4 = S.
Tone hardware interface: The ErrorTone usage collects a tone
output report that sounds an immediate tone. The KeyClick usage
collects a tone output report that sets the sound made for a key
click. The units for Duration are milliseconds. The volume is a value
between Logical_Minimum (silent) and Logical_Maximum (greatest
volume). The tone is an index from Table 2: Note Numbers and
Frequencies.