User`s manual

Preliminary
Genie Monochrome Series-GigE Vision Camera Operational Reference • 49
General Inputs
External Input Signal Opto-coupler & Debounce Circuit
• Genie provides two sets of opto-coupled inputs for either RS422 or TTL signals. These can be
used as external trigger sources.
• See "
12-Pin Hirose Connector Signal Details" on page 91 for connector pinout and electrical
information. The cable shell and shield should electrically connect the Genie chassis to computer
chassis for maximum EMI protection.
• For external triggers, a rising edge signal is suggested to minimize the time it takes for the
opto-coupler to change state. (The opto-coupler response time is typically 10µs for rising edge
compared to 50μs for falling edge).
• Each input incorporates a signal debounce circuit (following the opto-couple) to eliminate short
noise transitions that could be wrongly interpreted as a valid pulse. The duration is user-
programmable from 1µs to 255µs with CamExpert.
• Note, the external trigger input propagation delay is dependent on the signal used to activate the
opto-coupled input. Typical delays are 3 µs for Active Open and 5 µs for Active Close.
General Inputs: Settings Via CamExpert
CamExpert provides control of inputs via the I/O Controls Parameters tab. The Input Settings dialog
box allows you to view the signal and status for each pin on the Hirose connector. The Polarity drop-
down list boxes, located in the INPUT Settings area, allow you to specify the polarity of the Input 1
and Input 2 as either Active High or Active Low. The Minimum duration field for each input, allows
you to specify the minimum trigger length (1-255µs ) so that input transitions are debounced to
prevent unwanted trigger events.