Martin MAC 250+ Manual de usuario descargar pdf (Pagina 12)

MAC

250 and

MAC

250

section 4

OPERATION

This section describes the effects and how personality settings affect their behavior. Selecting personalities from the

control panel is described in the previous section.

DMX-512 control

The MAC 250 and MAC 250

can be operated with DMX-512 controllers in 4 modes that combine vector and/or track-

ing control with 8-bit or 16-bit pan/tilt resolution.

Tracking control

With tracking control, the speed at which effects move is set by programming a cross-fade time on the controller. The

controller divides the move into steps and updates the fixture with small changes at the rate required to achieve the

fade. The fixture tracks the changes and averages them with a digital filter algorithm to provide smooth movement at

all speeds.

This algorithm is adjustable to compensate for controllers that calculate position changes unevenly. In most cases the

default settings work well. If movement is not satisfactory there are 2 parameters that can be adjusted. The first is the

calculation method used and is selected under

PERS/TRAC/MOdE. MOd1, the default, calculates speed based

on the absolute value of the change in DMX; it is the best choice with controllers that calculate intermediate positions

that are close to the line of travel. MOd2 uses the real value of the DMX delta to calculate speed and is better if the

intermediate positions stray significantly from the line of travel.

The second parameter is the number of position updates used to calculate speed. The level is adjustable between 1 and

10 under

PERS/TRAC/CAL. Increasing the number of samples increases the distance over which speed is calcu-

lated, making movement smoother but less responsive to sudden changes.

The ideal settings for both parameters will vary from controller to controller: experiment for best results.

Vector control

With vector control, you set the speed on a speed channel. This provides a way to control speed on controllers without

cross-faders. Vector control also provides smoother movement, particularly at slow speeds, with controllers that send

slow or irregular tracking updates, plus a “blackout speed” and overrides of the shortcut and pan/tilt speed personality

settings. When using vector speed, the cross-fade time must be 0.

Tracking control can be enabled in vector mode by setting one or both of the speed channels to “tracking speed.”

8-bit versus 16-bit pan/tilt resolution

With 8-bit pan/tilt resolution, pan and tilt are divided into 256 equal increments. Finer position control and smoother

movement are provided in 16-bit mode, which divides pan into 40,192 positions and tilt into 43,008 positions.

Martin RS-485 control

The MAC 250 is fully supported by the Martin 3032 controller with version 2.05 or higher software. The MAC 250

may be set up on the 3032 as a MAC 250: gobo indexing, however, is not supported. To respond to the 3032, Martin

mode must be selected or automatic protocol detection must be enabled as described on page 10.

Controllable effects

All mechanical effects are reset to a home position when the fixture is powered up. They can also be reset via DMX.

Accidental resets can be prevented by turning DMX Reset (

PERS/dRES) off.

An on-the-fly position correction system automatically corrects the position of the color and gobo wheels; this feature

can be disabled by turning Effects Feedback (

PERS/EFFb) off.

General operation may be optimized for speed or quietness with the Studio Mode setting (PERS/STUd).

Lamp

With the default setting, the lamp remains off until a “lamp on” command is sent from the controller. Note: A peak of

electric current that can be many times the operating current is drawn for an instant when striking a discharge lamp.

Striking many lamps at once may cause a voltage drop large enough to prevent lamps from striking or draw enough

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Martin MAC 250+ Manual de usuario Pagina 12

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