Commands in Software Integrating barcode data matrix in Software Commands

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Commands generate, create 2d data matrix barcode none with software projects Android Controller Equipment Fig. 3.3. Second schematic view of the system 3.2 Design patterns 3.1.6 The door Placi Software DataMatrix ng a controller between the commands and the equipment is certainly not su cient: we have also to make these commands more sophisticated in order to protect the user.

In fact, the key is clearly the two commands for engaging and disengaging the clutch. For this, a door is put in front of the press. This is illustrated in Fig.


open Fig. 3.4. The door closed Initially, the door Data Matrix barcode for None is open. When the user depresses button B3 to engage the clutch, then the door is rst closed before engaging the clutch, and when the user depresses button B4 to disengage the clutch, then the door is opened after disengaging the clutch..

3.2 Design patterns In this example, there are many cases where a user can depress a button, which is eventually followed by a certain reaction of the system. For example buttons B1 and B2 have an eventual action on the motor.

This is not a direct action however. In other words, there is no direct connection between these buttons and the motor. Direct actions on the motor are initiated by the controller, which sends commands after receiving some information coming from buttons B1 or B2.

For example, when the motor does not work, the e ect of depressing button B1 is to eventually have the motor working. Likewise, when the motor is working, the e ect of depressing button B2 is that the motor will eventually stop. Note that when the user depresses such a button, say button B1, and releases it very quickly, it might be.

A mechanical press controller the case that nothin g happen simply because the controller has not got enough time to gure out that this button was depressed. Another interesting case is the one where the user depresses button B1 and keeps on depressing it by not removing his nger. Once the motor starts working, the user depresses button B2 with another nger.

This results in the motor eventually stopping. But the fact that now button B1 is still depressed must not have any e ect, the motor must not restart. This is due to the fact that any button must be rst released in order to be taken into account once again.

A more complicated case corresponds to the following sequence of actions as indicated in Fig. 3.5:.

B1 1. B2 4. 2 Controller 3 Motor Fig. 3.5. Race conditions between 3 and 4 (1) the user depress DataMatrix for None es button B1 (starting motor) and, not too quickly, releases it; (2) the controller responds to this depressing of button B1 by sending the start command to the motor; (3) the motor sends back to the controller information informing that it has started working; (4) the user depresses button B2 (stopping motor) and, not too quickly, releases it. The di culty is that actions (3) and (4) are done in parallel by the motor and by the user. Both these actions have to be taken into account by the controller.

If action (3) (feedback from the motor) wins, then action (4) (depressing the stop button) is followed by a controller reaction, whose purpose is to send to the motor the stop command. But if action (4) wins, then the reaction of the controller cannot be performed as the controller does not know yet whether the motor is working since it has not received the corresponding information from the motor. In that case, depressing button B2 is not taken into account.

. 3.2 Design patterns What we would like t gs1 datamatrix barcode for None o do in this section is to have a formal general study of such cases. This will allow us to have a very systematic approach to the construction of our mechanical press reactive system in further sections..

3.2.1 Action and rea ction The general paradigm in what we mentioned in the previous section is that of actions and reactions.

Actions and reactions can be illustrated as shown in Fig. 3.6.

We have an action, named a and represented by the plain line, followed by a reaction, named r and represented by the dashed line. Action and reaction can take two values: 0 or 1. We note that r, the reaction, always takes place after a, the action.

In other words, r goes up (1) after a has gone up (1). Likewise, r goes down (0) after a has gone down (0)..

1 a 0.
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