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h5. Overview
ScanImage requires an initialization (INI) file, usually named _standard.ini_, to be selected at startup. This file specifies & initializes all the state variables for ScanImage.  

Typically there is only one INI file per ScanImage installation (a 'rig'). ScanImage 3.5 introduces some changes to the way INI files are handled. Please familiarize yourself with [Initialization (INI) File Handling|Important Changes in ScanImage 3.5#Initialization the section about [Initialization (INI) File Handling]. 

A subset of the INI file variables -- termed the *Rig Configuration* variables -- are demarcated at the beginning of the INI file. Rig Configuration variables are those which may require modification for a new ScanImage installation. These variables are rig-specific, and are not associated with either configuration (CFG) or user (USR) files. The values for these variables are not modified/modifiable during ScanImage program operation. 

h5. Rig Configuration Variable Reference
 This section serves as a reference to the new and notable _Rig Configuration_ variables in ScanImage 3.5. {report-link:source=ScanImage Files^r3_5_standardINI_rigConfig.txt|key=attachment:download path|target="_blank"}*View Rig Configuration section of _standard\_model.ini_ file*{report-link}.

Users should adjust the Rig Configuration values to match the hardware and experimental requirements for their rig, creating their own _standard.ini_ file.

(/) The _standard\_model.ini_ file contains comments which document the meaning of each of the variables.
(!) The INI file parser is whitespace sensitive. The format <VARNAME>=<VARVALUE> must be strictly followed, i.e. no space to left or right of the equal sign

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*triggerLineIndex*: (Previously below Rig Configuration section) Allows specification of the _static digital output line_ used as the shared trigger source for acquisition, mirror, and Pockels cell board(s). The use of Port 0 on the board specified by _triggerBoardIndex_ is assumed.

*triggerInputTerminal*, *externalTriggerInputTerminal*, *externalTriggerTimeout*: See [External Triggering and Trigger Simplification|Important New Features in ScanImage 3.5#External Triggering and Trigger Simplification] for more details.

*outputBoardClockTerminal*: See [Clock Synchronization|Important Changes in ScanImage 3.5#Clock Synchronization] for more details.

*maxBufferedGrabTime*: See [Unlimited and Uninterrupted Acquisition|Important New Features in ScanImage3.5#Unlimited and Uninterrupted Acquisition] for more details.

*maxFlybackRate*: This variable is reserved for ScanImage r3.6.

*scanOffsetX/Y*: (Previously below Rig Configuration section) Specify offset voltages for mirror command signals. These variables are unique among the Rig Configuration variables in that they can be altered during ScanImage operation. See [Beam and Scan Alignment Tools|Important New Features in ScanImage3.5#Beam and Scan Alignment Tools] for more details.

*parkAmplitudeX/Y*: (Previously below Rig Configuration section) Specify voltages determining X/Y mirror positions when parked. (!) Beam safety should be considered in setting these values.

*maxAmplitudeX/Y*: Specify max voltage allowed for X/Y amplitudes. This clamps the sum of the scan amplitude and the scan shift set in ScanImage, for each dimension.

h6. Shutter Variables
The separate values for 'open' and 'closed' have been removed. Variables _open_ and _epiShutterOpen_ are sufficient to specify the 'polarity' of shutter TTL control signal.
The variable _shutterBoardIndex_ is new in r3.5. See [Shutter output line(s) can be on any board|Other New Features and Changes in ScanImage 3.5#shutterAnyBoard].

h6. Motor Variables
The number of variables in the rig-specific motor section has been greatly reduced.
Two variables, _firmware_ and _posnResolution_, are new in r3.5. See [MP-285 Interface Improvements|Important New Features in ScanImage 3.5#MP-285 Interface Improvements] for more details.
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