ASI MFC2000 Operation - Seite 11

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transitions can be counted to provide a "pixel" clock for an external recording device.

Synchronous Encoder Reporting

The TTL_REPORT_INT ﬁrmware module allow for external TTL synchronized position reporting. The

position reports are sent to the auxiliary serial port on the MS 2000 WK in a binary format so that

rapid, low jitter position reporting is possible for real-time positioning tasks. Contact ASI for details.

Tracking Features

ASI's PhotoTrack system uses the TRACKING ﬁrmware module along with hardware available from ASI

that allows the stage to latch on and track spots of ﬂuorescent illumination from labeled organisms. A

quadrant PMT is used to provide sensitive and rapid position feed back information from the

illuminated target. Contact ASI for details.

Safety, Diagnostic and Alignment Features

Motor-driver current-limits prevent the motors from fully powering into hard stops. In addition, the MS

2000 controller is constantly monitoring the positions of the motors under its control. Situations that

may result in run-away conditions (such as reversed polarity motors or encoders), or situations where

the motor is not able to follow the desired move trajectory (e.g., when mechanical interference limits

the motion), cause the controller to detect an error condition. The motors are immediately turned oﬀ

and the oﬀending axis is disabled. If this happens, a 'D' character is displayed as the status indicator

on the LCD display. The user should correct the problem and then reset the controller to regain

control of the disabled axis.

Controllers using ﬁrmware Version 6.0 and newer utilize a motor driver circuit where all analog circuit

alignment is done either automatically in ﬁrmware, or via serial commands. The user need not open

the case to adjust the drive-circuit feedback and zeroing levels.

The ﬁrmware also keeps track of any internal error conditions that may arise during operation and

saves the last 255 error codes in a buﬀer that may be read out for diagnostic purposes (see the serial

DUMP command). The controller also has a built in "move buﬀer" that holds move dynamic

information for up to 200 servo cycles. The user may utilize this buﬀer to attempt advanced tuning of

the controller for special applications or extremely fast or slow moves. Please see the section MS

2000 Optimal Alignment Procedures for a full discussion of these issues.

Clocked Devices

The MS 2000 controller supports clocked rotational devices, such as motorized objective nosepiece

turrets, ﬁlter cube turrets, and ﬁlter wheels. These devices move to discrete clocked positions. Manual

control is usually via the @ button to advance to the next position. The serial MOVE command is used

to move the devices to a speciﬁc integer-value clocked position. The current position is reported using

the WHERE command.

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MS2000, MFC2000 and RM2000 OPERATION