Matrox RadientPro CL acquisition section 43
The rotary decoder supports a maximum encoder frequency of up to 30 MHz
(depending on the amount of time spent debouncing the signal). The LVDS
receivers of the Matrox RadientPro board support 3.3 V rotary encoders.
❖
Note that an external source must be used to power the rotary encoder.
You can configure the rotary decoder’s settings, using the MIL-Lite function
MdigControl()
with
M_ROTARY_ENCODER...
, or by modifying the DCF file
with Matrox Intellicam.
User signals
Auxiliary signals can also be used to transmit or receive application-specific user
output and/or input.
If you want to start or stop an external event based on some calculation or analysis,
you can manually set the state of any auxiliary output signal (or I/O signal set to
output) to high or low. To do so, you set the state (on/off ) of a bit in a user settable
register (static-user-output register). When the bit is on, its associated auxiliary
output signal will be high; when it is off, the auxiliary output signal will be low.
This bit is referred to as a user-bit.
Your application can also act upon and interpret the state of an auxiliary input
signal (or I/O signal set to input). The state of an auxiliary input signal is not
associated with a user-bit; you poll the state of the signal directly. The state of an
auxiliary input signal can also generate an interrupt.
To route the state of a user-bit to an auxiliary output signal, use MdigControl()
with
M_IO_SOURCE
and
M_USER_BITn
; to set the state of a user-bit, use
MdigControl()
with
M_USER_BIT_STATE
. To poll the state of an auxiliary
input signal, use
MdigInquire()
with
M_IO_STATUS
; whereas to have the signal
cause an interrupt, use
MdigControl()
with
M_IO_INTERRUPT_STATE
and
then use
MdigHookFunction()
with
M_IO_CHANGE
to hook a function to
this event (that is, to set up an event handler).
