HP Vectra Technical Reference Manual page 109

D --.A B5---><
100 Input System and HP-HIL
Physical device
1/0
descriptor byte. This byte contains information on the
number of prompts and acknowledges the device supports. See
HP-H/L
Technical Reference Manual
for more information.
Physical device extended describe byte. This byte contains additional
device characteristics. See
HP-H/L Technical Reference Manual
for more
information.
Maximum number of axes supported by the device. Valid range is 0-2.
Device class. Bits 7-4 contain the current class. Bits 3-0 contain the
default class. See Appendix G for more information on device classes.
Number of buttons and prompts supported by the device. Bits 7-4 is the
number of prompts. Bits 3-0 is the number of buttons.
Maximum number of bytes that can be output to the device using a
single write command.
Number of write registers supported by the device.
Number of read registers supported by the device.
Transitions reported per button, i.e. a set bit indicates that the
corresponding button was either pushed or released. Bit 7 corresponds
to button 7 etc.
Current state of the buttons.
1
is down, 0 is up. Bit 7 corresponds to
button 7 etc. If D_STATE is XOR'ed with D_TRANSITION the result is
the previous button state.
This is the resolution of the physical device. The resolution is in counts
per meter for devices that report 8 bits of data. For devices that report
16 bits of data the resolution is in counts per centimeter.
Maximum count (in units of resolution) for the x-axis.
Maximum count (in units of resolution) for the y-axis.
X position data for devices which report absolute coordinates (absolute
devices).
Y
position data for devices which report absolute coordinates.