Interfacing 3rd Party Instruments to the PPMS Software Environment

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Hello world 1 (receiving advisories): To introduce the process of receiving advisories to trigger Delphi programs, we will start with the generic “Hello World” program. In this situation, we will have the Model 6000 send out an advisory, which will trigger the Delphi Program to print a “Hello World!” text on the computer monitor. This program will be kept very simple so that you can quickly get an understanding of how the Delphi template program accepts advisories. To create this program, follow the step-bystep procedures given below. We will explain the details of the program after the procedures. • Start Delphi. Delphi will open with several windows on the Desktop. These windows include the Form Designer, Code Editor, Object Inspector and the Toolbar. Close the current Form (form1) and Code Editor (unit1.pas). • Select “Open Project” from the “Files” menu. Open the Quantum Design project1.dpr file that you downloaded from our website. Delphi will respond by displaying the PPMS Commands Form and the unit1.pas template on the desktop. (See Figure 1). Figure 1. Delphi template program. Quantum Design PPMS Application Note 1070-202 B 4 04/09/2002
• Click on the unit1.pas window. The Code Editor begins with the declaration of several variables and is set-up to receive advisories. As you scroll down through the code, you will get to the section where there is a holdoff command that will send a command to the Model 6000 to pause the sequence as it executes the application code for your external instrument. This feature gives the ability to put the Model 6000 in a stationary state while the application is being run. Following the holdoff command there is a comment block stating were to put the third party application code. This is where we will add the code for our “Hello World!” program. Type the following code in this section (See Figure 2): ShowMessage (‘Hello World!’); Note: At the end of this section of code another command string is sent to the Model 6000 to release the holdoff. This will bring the Model 6000 out of its stationary state and it will continue the rest of the PPMS sequence. For a further description of Holdoff commands or other PPMS command strings, see PPMS GPIB commands in the User’s manual. Figure 2. “Hello World!” program code. • Run the program. There should be no errors and the run button will be grayed out indicating that the program is currently running. Quantum Design PPMS Application Note 1070-202 B 5 04/09/2002
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