How to find COM port for a specific USB device

I want to automatically find the COM port for a specific USB device. I use the VISA find resource function but I can't get the manufacturer's ID. VISA says the device doesn't have this information. The find resource function does narrow my search (and often finds the port depending on what other usb devices are connected). In the case where it finds multiple possible ports, can I safely send a message to each port to determine if it is the correct device? I know it will work for my purposes but I don't know if I am asking for trouble by sending messages to unidentified devices. Any thoughts on how I can identify my device port will be appreciated. Thank you - Dave F

You can do it using WMI. I have C# code I am supposed to convert into LabVIEW foing something similar to what you want to do. In my case, I am testing a USB device and need to know which port on the hub is which COM port (the device creates a virtual COM port for communication). Using WMI, you can find the hardware path to the device and know that COM10 is USB hub Port 1 for example. Unfortunately, I cannot share the C# code.
You can download the WMI Code Creator tool from Microsoft, which should help you tremendously find the proper method of getting your info.
You basically want to look at all the W32_USB devices for the specific device you are looking for. Once you have that, you can look for the COM Port associated with it. I don't know when I will get to coding this up in LabVIEW, but will report back when I do, assuming you haven't found the solution by then.

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How to find user exits for a specific field

hi,
    How can we find a user exit for a specific fields .
as i know Three ways to search user-exits
1. SE80 look includes in a packages with name user-exits
2. by zreport which will fetch user-exit in a T-CODE
3. SMOD
but what if we have to find a user-exit for particular field for e.g bupla(bussiness place) in MIRO.
Please suggest me.
Thanks and Regards ,
Rahul Singh.

Hi Rahul,
Here is the procedure to create field exits.
Step by step procedure for creating Field Exits
There are eight steps to creating a field exit:
Step 1: Determine Data Element
Step 2: Go To Field Exit Transaction
Step 3: Create Field Exit
Step 4: Create Function Module
Step 5: Code Function Module
Step 6: Activate Function Module
Step 7: Assign Program/Screen
Step 8: Activate Field Exit
Step 1: Determine Data Element
u2022     Before you can begin adding the functionality for a field exit, you must know the corresponding data element.
Step 2: Go To Field Exit Transaction
u2022     The transaction to create field exits is CMOD.
u2022     You can use the menu path Tools -> ABAP/4 Workbench -> Utilities -> Enhancements -> Project management.
u2022     From the initial screen of transaction CMOD, choose the Text enhancements -> Field exits menu path.
u2022     After choosing this menu path, you will be taken to the field exits screen. From here, you can create a field exit.
NOTE : Even though you use transaction CMOD to maintain field exits, you do not need to create a project to activate field exits.
Step 3: Create Field Exit
u2022     From the field exit screen of transaction CMOD, choose the Field exit -> Create menu path.
u2022     After choosing this menu path, a dialog box will prompt you for the appropriate data element .
u2022     Enter the data element name and click the u2018Continueu2019 pushbutton.
u2022     Now, you will be able to create the function module associated to the data elementu2019s field exit.
Step 4: Create Function Module
u2022     You will automatically be taken to the Function Library (SE37) after entering a data element name and clicking the u2018Continueu2019 pushbutton.
u2022     In the u2018Function moduleu2019 field, a function module name will be defaulted by the system based on the data element specified. This name will have the following convention:
FIELD_EXIT_<data element>
u2022     You can add an identifier (an underscore followed by a single character ).
u2022     The first function module for a data elementu2019s field exit must be created without an identifier.
u2022     To create the function module, click on the u2018Createu2019 pushbutton, choose menu path Function module -> Create, or press u2018F5u2019.
u2022     After choosing to create the function module, you will get the warning: "Function module name is reserved for SAP". This message is just a warning so a developer does not accidentally create a function module in the field exit name range. By pressing u2018Enteru2019, you will be able to go ahead and create the function module.
u2022     Before coding the function module, you will have to specify the function modules attributes -- function group, application, and short text.
Step 5: Code Function Module
u2022     From the function moduleu2019s attributes screen, click on the u2018Source codeu2019 pushbutton or choose the Goto -> Function module menu path to the code of the function module.
u2022     Here you will add your desired functionality for the field exit.
u2022     Remember that field exitu2019s function module will have two parameters -- one importing parameter called "INPUT" and one exporting parameter called "OUTPUT". These parameters will be set up automatically by the system.
u2022     You must remember to assign a value to the OUTPUT field. Even if the value does not change, it must be moved from the INPUT field to the OUTPUT field.
Step 6: Activate Function Module
u2022     After coding the function module, you must remember to activate it.
u2022     Use the Function module -> Activate menu path to activate the function module.
u2022     At this point, you can return to the field exit transaction.
u2022     You should be able to 'green arrow' back to this transaction.
u2022     When you return to the field exit transaction, you will see an entry for the newly created field exit.
u2022     At this point, the field exit is global. That is, it applies to all screens that use a particular data element. On any screen that uses the data element, the corresponding field exit function module will be triggered, once it is active.
u2022     Also, the field exit will not be triggered yet because it is inactive.
Step 7: Assign Program/Screen
u2022     This step is only needed if you want to make a field exit local.
u2022     To make a field exit local, select the field exit and click on the u2018Assign prog./screenu2019 pushbutton.
u2022     In the dialog box , indicate the appropriate program name and screen number.
This information indicates that the field exit is local to the specified screen in the specified program.
u2022     In the dialog box, you determine which function module gets executed for the field exit by specifying the identifier in the u2018Fld. Exitu2019 field.
u2022     If this field is left blank, the function module triggered will be 'FIELD_EXIT_<data element>'.
u2022     If a single-character identifier is entered into the field, the function module triggered will be 'FIELD_EXIT_<data element>_<identifier>'.
Step 8: Activate Field Exit
u2022     The field exit must be active for it to be triggered by the system.
u2022     Activate the field exit by choosing the Field exit -> Activate menu path.
u2022     After assigning the field exit to a change request, its status will change to u2018Activeu2019 and it will be triggered automatically on the appropriate screen(s).
NOTE : In order to activate the field exit the profile parameter abap/fieldexit = YES must be set on all application servers
Execute the transaction SE38 with PROGRAM NAME - RSMODPRF
Then give the Data Element Name for which field you want to create the exit(Just cross check with your field data element) and execute.
then it takes you to SE37 with the function module name FIELD_EXIT_<DATA ELEMENT NAME> and then create the same function module.
and in the coding part, You can write your logic to display the output of that field. and activate it.
once you complete the above,
Again execute SE38 transaction with program RSMODPRF and again click on Execute button without any Data Element Name. Now you select the data element which you have created and click on Assign prog/ Screen button and assign the program name and screen number of the filed and click on the menu Field Exit and Activate.
Hope it helps.
Regards
Radhika
Edited by: Radhika Pande on Nov 26, 2009 7:58 AM

How to find user exit for a specific function

Hello Gurus,
      I have some question about user exit:
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    (2) I think user exit is active subroutine in the main program. so if I know the name of some user exit, how can I get the program code for it ? ( ie. how to get name of main program, name of include file ? )
thanks very much!

Hi friend,
     thanks for your suggestion. I have read that book. but this question is not clear in that book . I'd like to repeat may question again:
   (1) if I want to implement a tailored function by user exit, how can I know which userexit
       should I use ?
   (2.) I wonder if there is a document which shows which userexit corresponds which
       program?
in fact, if I know the place where I can put my own abap subroutine in , everything will be done.
thanks very much!

How to find CUSTOMER EXIT for a Standard SAP program

How to find CUSTOMER EXIT for a Standard SAP program

Hi
To introduce the techniques of enhancement in standard SAP system. SAP creates customer exits for specific programs, screens, and menus within standard R/3 applications. These exits do not contain any functionality. Instead, the customer exits act as hooks. You can hang your own add-on functionality onto these hooks.
They do not affect standard SAP source code.
When you add new functionality to your SAP System using SAPs exits, you do not alter the source code of standard SAP programs in any way. The code and screens you create are encapsulated as separate objects. These customer objects are linked to standard applications, but exist separately from SAPs standard software package.
They do not affect software updates.
When you add new functionality to your SAP System using SAPs exits, your objects (called customer objects) must adhere to strict naming conventions. When it comes time to upgrade a to a new software release, customer objects names ensure that they will not be affected by any changes or new additions to the standard software package.
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Any change made to an SAP object in a customer system is called a modification. Customers usually modify their systems for one of two reasons. Either they make changes to the SAP standard in order to adjust the R/3 System to their specific business needs (actual modifications), or they alter individual SAP objects in order to correct an error (as recommended in an SAP error note).
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SAP enhancements are made up of component parts. These components include function module exits, menu exits, and screen exits. A specific component may be used only once in a single SAP enhancement (this guarantees the uniqueness of SAP enhancements).
Customer enhancement projects consist of SAP enhancements. Each individual SAP enhancement may be used only once in a single customer enhancement program (this guarantees the uniqueness of a customer project).
SAP application programmers preplan function module exits, menu exits, and screen exits for their applications and combine them to create useful enhancements for the R/3 System.
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