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The DIG-711 and DIG-711A modules contain eight optically isolated input lines, each with a small status indicator lamp. Both feature screw terminal connections for normally open switches operating from a 24 to 28 V DC power supply. This includes -28 V supplies. The DIG-711A also includes jumper settings to invert the input function for normally closed switches.
The DIG-712 and DIG-712F modules contain sixteen optically isolated input lines for both normally open and normally closed switches wired to a single DB-25 connector. The DIG-712F has a faster time constant (100 Hz vs. 10 Hz) and is recommended for pigeon keys. Use DIG-712 for most other applications.
Any of the input modules may be set to pulse (also known as transition mode) or level modes of operation. In the pulse mode switch closures are filtered, contact debounced and latched. A single switch closure sets a latch on the card that is held until read and reset by the computer. In the level mode, only an input that is present when the card is read is recognized. With MED-PC® IV, WMPC™ and Schedule Manager™ software the level mode produces a count every interrupt (typically 10 ms) for as long as the input "switch" is closed. In general, use pulse mode with response levers or keys to increment a single count for each response, and use level mode with photobeams and nose pokes to determine how long the beam is interrupted or to define beam breaks with specific time values.
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