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 the ScanImage configuration and determines which variables are associated with configuration (CFG) and user (USR) files. Typically there is only one INI file per ScanImage installation (a 'rig'). A subset of Rig Configuration variables are demarcated at the beginning of the INI file; these copmrise the variables that typically require modification for a new ScanImage installation. Rig Configuration variables are not associated with either CFG or USR files and are not modified during ScanImage program operation. Typically only one INI file is required per rig.
ScanImage r3.5 introduces some changes to the way INI files are handled. Please familiarized yourself with Initialization (INI) File Handling.
In addition, the variables in the Rig Configuration section have been modified. These changes are described in the following sections.
Rig Configuration Variable Reference
The INI file contains a large number of variables. Only a small number of these typically require adjustment for a ScanImage installation to a new rig. These Rig Configuration variables are clearly grouped at the beginning of the standard_model.ini file. Users should adjust these values to match the hardware and experimental requirements for their rig, to create their own standard.ini file.
This section provides an overview of the new and notable variables in this section, serving as a reference
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
ScanImage r3.5 has added a few and removed several variables from this frequently-modified section. [
View Frequently Modified Section of Standard.INI File
]
New and notable INI file variables in this section are:
triggerLineIndex: (Previously below rig-specific section) Allows specification of the static digital output line used as 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: Specifies the single Programmable Function Interface (PFI) terminal which the acquisition, mirror, and Pockels Cell board(s) will all use as their default trigger input. This terminal on the one or more boards should be connected to the trigger source specified by triggerBoardIndex and triggerLineIndex. This is part of trigger simplification feature in r3.5.
externalTriggerInputTerminal: Specifies the single Programmable Function Interface (PFI) terminal which the acquisition, mirror, and Pockels Cell board(s) can all use as their optional external trigger input, as described in [External Triggering and Trigger Simplification].
externalTriggerTimeout: Specifies time to wait for external trigger input to arrive. See [External Triggering and Trigger Simplification].
outputBoardClockTerminal: Specify terminal, either PFI or RTSI(0-6), which will be used to synchronize the clocks of the acquisition/mirror board to the Pockels cell board (if present). Previously RTSI7 was assumed/required. See Clock Synchronization for more details.
maxBufferedGrabTime: Specifies max duration, in seconds, of an acquisition (effectively limiting the max number of frames) to allow without using 'SaveDuringAcquisition' option. This value should typically not be altered. Longer acquisitions should employ the new [Continuous Disk Logging] feature.
maxFlybackRate: This value is reserved for r3.6.
scanOffsetX/Y: (Previously below rig-specific section) Specify offset voltages for mirror command signals. These variables are unique among the Rig Specific variables in that they can be altered during ScanImage operation. See [Beam and Scan Alignment Tools] for more information.
parkAmplitudeX/Y: (Previously below rig-specific section) Specify voltages for X/Y mirror 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.
Shutter Variables_
The separate values for 'open' and 'closed' have been removed. Variables open and epiShutterOpen are sufficient to specify 'polarity' of shutter interface.
shutterBoardIndex: See Shutter output line(s) can be on any board.
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 for details.