ETS-Lindgren 2090 Controller User Manual

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Appendix A: Model 2090 GPIB Command Reference

Model 2090 Multi-Device Controller

DIR?

Compatibility:

2090 (Firmware Rev 3.00)

Description:

Queries the motion direction for the device and provides an enhancement over
the functionality provided by the *OPC and *OPC? commands. Unlike *OPC
or *OPC?, which indicate the completion of a motion command, the DIR?
Command returns the current motion of the device, and thus may take on
several values during the course of a single motion command. The response
of the DIR? command corresponds to the state of the motion indicators on the
front panel of the 2090. Thus, if a device is commanded to change direction,
the DIR? command will switch between indicating the current direction, a
stopped condition, then the new direction, and finally stopped at the end of the
target motion. For the same command, *OPC? will respond with a zero until
the stop at the end of the target motion. Similarly, when in SCAN mode,
*OPC? will always respond with zero until another motion command or stop
is issued and completed, while DIR? will change each time the motion
changes.

Devices:

Towers, Turntables

Syntax:

DIR?

Response:

Value indicating the current motion of the queried
device.

Device is moving up/clockwise.

Device is stopped.

-1

Device is moving down/counterclockwise.

Example:

CALL ibwrt (TowerUD%, "DIR?")

' Query tower motion direction

CALL ibrd (TowerUD%, rdbuf$)

' Read response

CALL ibwrt (TableUD%, "DIR?")

' Query turntable motion dir.

CALL ibrd (TableUD%, rdbuf$)

' Read response

See Also:

*OPC, *OPC?

Compatibility:

All

Description:

Instructs the tower boom to move in the Down direction. This movement is
limited by the lower limit.

Devices:

Towers

Syntax:

Example:

CALL ibwrt (TowerUD%, "DN")

' Instruct the boom of the
' tower to move down

See Also:

ST, UP

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