User`s guide

SHUTTER CONTROL
SDK SECTION 7
Page 60
SHUTTER TYPE
The shutter control line is a TTL compatible pulse, which can be either active high or active low to allow the
control of an external shutter.
NOTE: If the camera has an internal shutter (the function
IsInternalMechanicalShutter can be used to
test this) but cannot control the internal and external shutter independently (check the capability
AC_FEATURES_SHUTTEREX) then the TTL pulse will always be active high.
• If you set the shutter type to TTL High with SetShutter or SetShutterEx, the Andor SDK will cause
the output voltage to go ‘high’ to open the shutter.
• If you set the shutter type to TTL Low with SetShutter or SetShutterEx, the Andor SDK will cause the
output voltage to go ‘low’ to open the shutter.
For Classic systems this pulse will be sent through the Andor PCI card. For other systems this pulse will
be sent through the shutter SMB connector on the camera.
The documentation supplied by the shutter manufacturer will advise the user whether your shutter opens at a
high or a low TTL level.
NOTE: With Full Vertical Binning there is no shutter pulse. The shutter will always be in the Open
position. See Shutter Mode on the previous page and Shutter Transfer Time on the next page.
The I/O Box also contains a 30V shutter jack socket, which produces the same signal as the TTL output but
is always high to open (see User Guide for further details). NOTE: Only applicable to classic systems.
For iXon+ cameras that have independent shutter control (capability AC_FEATURES_SHUTTEREX) we can
control the TTL type and mode of the internal (if available) and external shutter independently using function
SetShutterEx, The external shutter signal will be output through the Shutter SMB port on the rear of the
camera. The internal and external shutters will have the same opening and closing times.