The following diagram follows the entire path of the Scanning Interface Unit (SIU) v2.2 video A input circuit.

printing this page: Set view to landscape and print at 40%.

Notes:

• Scanning Interface Rev 2.2 is printed on the card inside the SIU.
• SEII Rear Panel Connector is that of the computer card.
• Scanning I/O B is an SIU rear panel connector.
• The circuit shown is inside the SIU.
• The video signal from the microscope enters the SIU at pin 5 of Scanning I/O B.
• The op-amp circuits add gain and offset.
• The video enters the SEII computer card at pin 8
• Scanning I/O B can also output the video at pin 6 for switching needs.
• The relay switches both the signal and ground.