Contec AD12-8(PM), Руководство пользователя

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4. Functions
AD12-8(PM)
49
Start Condition
The condition for controlling the start of sampling can be selected from among software and input data
comparison. The conditions for controlling the start and stop of sampling are completely independent
of each other; they can be set separately.
- Software
The PC card starts sampling and storing input data to memory immediately after the operation start
command is issued.
- Input data comparison
When the operation start command is issued, the PC card compares the analog signal input through
a specified channel to the value of the preset comparison level. If the analog signal satisfies the
condition, the PC card starts storing input data.
Level comparison conditions are set as two conditions: level and direction.
The above sketch shows that the level comparison condition is satisfied in the rising direction.
The start condition is satisfied when the analog signal at the specified channel passes the
comparison level in the rising direction. Input data items are stored to memory, starting with those
at solid dots.
The above sketch shows that the level comparison condition is satisfied in the falling direction.
The start condition is satisfied when the analog signal at the specified channel passes the
comparison level in the falling direction. Input data items are stored to memory, starting with
those at solid dots.
If you set the level comparison directions to both directions, the start condition is satisfied when the
analog signal passes the level both in the rising and falling directions.