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When using a photogate, or other digital sensor, your command sequence should be as
follows:
Command 6,0 to force the CBL 2 to stop executing any prior commands (may not be
needed)
Command 0 to reset CBL 2 to a known state
Command(s) 1 to setup any channels needed for sampling (you must setup at least 1
analog channel)
Command 12, 41,3 to enable the photogate mode for digital CH 41 (Digital Input
Port 1)
Command(s) 4 to send the equations for any sensors that need special equations
(only if needed)
Command 3 to start sampling
GET commands to retrieve the data from the CBL 2 (This forces the calculator to
wait for sampling to finish.)
Command 12,41,0 to command the CBL 2 to return the number of transitions
recorded
GET command to retrieve the number of transitions from the CBL 2
Command 12, 41,M1 to command the CBL 2 to return the transitions recorded
GET command to retrieve the number of transitions from the CBL 2
Command 12, 41,M2 to command the CBL 2 to return the transition times recorded
GET command to retrieve the number of transitions from the CBL 2
General Information
There are six types of motion capture commands. Each digital data capture command is
designed to support the capture or measurement of data from the digital input. Some
commands capture data at periodic intervals while others are triggered by changes in
the data.
Each of the digital data commands is designed for a specific sensor and/or experiment
as shown in the following table:
Send {12, 41, mode}
Mode = 1
Send {12, 41, mode}
Mode = 2 and Mode = 3
36
Use
Sample Mode. This mode is used when none of the other
modes (below) are useful. In this mode, each time the
data changes, it is recorded in the CBL 2. This allows for
any new digital probes to be used if the user is willing to
write the program to process the data.
Use
Measures pulse width of the data on the D0 line. This
mode is used with a photogate to get very accurate
measurement of the time the photogate is blocked.
Generally, this measurement is used to determine the
speed of an object (must know object's length).
CBL 2 Technical Reference
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