Accessories for Imaging Products  Accessories are used to convey signals between the host computer and external devices such as cameras, wavelength switchers, filter changers, and analog and digital circuits.
DIO-3 Cable Interface The DIO-3 Cable Interface connects between the parallel port on the host computer and the external devices such as a filter switcher. The DIO-3 Cable Interface includes a 'break-out box' and a 25- wire cable. The cable brings all lines of a parallel output port to the two DB-25 connectors on the box. Certain lines are also brought to BNC connectors on the front panel.
The following table shows devices controlled by Imaging Workbench via the parallel output port.

BNC Name	Purpose
Sutter Instrument Lambda 10 and Lambda 10-2	Control the filter wheel and shutter of the Lambda 10-2, and the wheel of the Lambda 10. Note that the optional shutter on the Lambda 10 is controlled by the SHUTTER control line on the DIO-3.
Trigger In	Allow synchronization of episodic recording by Imaging Workbench 5 with other data acquisition/stimulation hardware and software. An example application is simultaneous synchronized episodic recording made with Imaging Workbench and with Axon Instruments Digidata 1320 or 1200 under control of software such as pClamp (pClamp digital command -> Digidata Digital Out -> DIO-3 Trigger In -> Imaging Workbench start sweep). Used if Imaging Workbench is to act as the slave and the other computer system as the master. Imaging Workbench requires a high digital (TTL) pulse as trigger.
Trigger Out	Similar purpose as for Trigger In described above, but used if Imaging Workbench is to act as master and the other system as slave. Imaging Workbench issues a HIGH digital (TTL) pulse whose duration can be changed.
Integrate	Control the time of on-chip image integration on CCD video cameras having this capability
Shutter	Control the optional shutter on the Sutter Instrument Lambda 10, and on other illumination control devices. This is not used by the TILL Photonics Polychrome; this needs a special PCI interface, described below.
Auxiliary	Additional functionality, e.g. select the optical bandpass filter in the two filter illumination control devices.

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Interface to Monochromators

For TILL Photonic Polychrome monochrometer or Cairn Research Optoscan monochrometer, the relation between wavelength and voltage is linear or nearly so. Imaging Workbench 5 can control the wavelength of the output light from Polychrome by controlling the analog voltage input to it via an interface card such as the National Instruments PCI6711, Data Translation DT331 or Measurement Computing CIO-DAC02. The first two are PCI bus devices, and the third, an ISA bus device. This board is plugged into an slot of the computer, and IW5 can control its output directly.