IBIC Section SixGPIB-PC User Manual 6-2 ©National Instruments Corp.In many cases, use of the applications monitor allows you to omitexplicit error-checking code from the application. If a program isexpected to run without errors, trapping on errors will cause the monitorto be invoked only if an error occurs during a GPIB call. You may thentake the action necessary to fix the problem.Currently, the applications monitor is only supported by the RevisionC.5.1 and later versions of the GPIB Rev. C handler.Installing the Applications MonitorThe applications monitor is included on the distribution diskette as thefile APPMON.COM. To install it, type the following command inresponse to the DOS prompt:APPMONIf the GPIB handler is not present or the monitor has been previouslyinstalled, it will not load and an error message will be printed.Once run, the monitor will remain resident in memory until you rebootthe system. Should you later desire that you no longer wish to devotememory to the resident applications monitor, simply reboot your system;the monitor will no longer be loaded.IBTRAPThe applications monitor provides the capability to trap on GPIBhandler calls which have particular bits set in the GPIB status word.The trap options are set by the special GPIB handler call, IBTRAP.This call can be made either from the application program, or from thespecial utility program called IBTRAP.EXE.Both the function call and the DOS utility allow you to select a mask,which determines those functions which will be trapped, and a monitormode, which selects what is to be displayed when a call is trapped.The exact syntax of the function call is dependent on the language youare using. See the description of IBTRAP in your language section fordetails on including IBTRAP calls in your application.The utility program IBTRAP may be used to set the trap mode fromDOS. Simply type IBTRAP in response to the DOS prompt, specifying
