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RF Screens- What and How?

RF Screen Enhancement Radio Frequency is a technology used to send data through the air. There is aremote wireless scanner (RF gun or any other handheld device) which accepts thedata and transfers it to the nearest Access Point. This access point is a networkdevice which allows a connection to some server.The user does transactions on a screen on the remote wireless scanner whichdirectly translates to a screen in R/3. Since RF transactions are mostly carried out onan RF gun (shown below), the screen needs to be much smaller in size (usually20X16) to fit the gun screen. 

RF transactions are special transactions. The specialties being the following:

1. The screen sizes are considerably smaller.

2. The screen logic is simple and user-friendly.

3. RF does not provide support for some of the advanced SAP GUI featuressuch as tab strips, Active X controls, etc.

Of course there are many more features, but this should suffice for a start.SAP’s Radio Frequency SolutionThe solution allows one to directly run SAP transactions on Radio Frequency (RF)equipment like handheld RF gun, or even forklift devices. SAP does not use anyfurther middleware to connect the devices to R/3. Because the screen sizes vary for 

the different RF devices, SAP has developed special transactions with very easy-to-use-and-enhance logic.Since no middleware is used, the SAP's RF solution is economical. Also, it reducesthe effort required considerably. Since the entire Business Logic lies inside the ABAPworkbench, users with a little knowledge of ABAP can easily use and enhance theexisting functions.

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SAP's Radio Frequency Solution helps enormously in Warehouse Automation. Youcan actually carry-out SAP transactions on the RF device, while moving around inthe warehouse, with much ease. Here is how it is done:

First, you need a terminal (scanner, RF device). This device must be configured for vt220 emulation and configured to connect to the SAPconsole server. SAPConsole - SAP's native character-based radio frequency solution designed totranslate GUI screens into character-based screens. SAPConsole by itself does notcontain any business logic. All functionality is maintained within R/3 and alldevelopment for SAPConsole transactions is performed inside the ABAP workbench. The SAPconsole server will be a standalone box and you have to install a telnetclient on your handheld devices to communicate with your backend system. Youexchange information through a character based interface.

 You will need to configure your sapconsole using the administrator in the controlpanel. Once all of this is setup, you can then run transaction from R/3 on your device; there will be some configuration for setting up the menus and. RF transactions and screens are developed the same way we develop any other GUI, with the only difference being that the RF screens are usually much smaller. 

A Case Study Business Scenario: RF Screen Enhancement Requirement:Develop a custom putaway transaction. This scenario required a custom transaction for putaway in a warehouse. Thecustomer had provided logic based on which goods had to be moved from one bin tothe other in a warehouse. Now, when you navigate to the Putaway screen through transaction LM00, there arefive pushbuttons for various options. It was here that a new pushbutton for theCustom putaway was required.

 Solution Developed Depending on the logic provided by customer, a custom putaway transaction withvarious screens was developed. One thing to be taken special care of is to designthe screens keeping in mind the handheld device screen. RF screens are usuallyclose to 20X16. 

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Due to the size limitations on an RF screen, we try to limit the function keys to as fewas possible.The Client wanted custom functionality on F1 and F4 functions which aregenerally reserved for Help and value request. Here is how we assign F1 and F4 to the function codes developed by us: In the PF status screen, navigate to Utilities->F Key Consistency. This opens a screens with all the possible Fn keys listed including F1 and F4 whichotherwise are reserved. We can easily assign the custom FCodes against the F1 and F4 Keys! Once the transaction has been developed, there lies one last step. How do wedisplay our transaction in the standard RF menu? There are two SAP tables in whichare used to maintain the RF transactions' information.

 The tables are:

1. T313A- Dynamic Menu Management

2. T313B- Dynamic Menu Management- Text table

 The standard SAP RF transactions use the same screen in different transactions.The menu is dynamically picked and displayed based on these two tables dependingon the user input. 

 An entry was created in both these tables so that the Standard putaway transactionshows the new "Custom Putaway" screen.

 T3130A takes the Warehouse Number, Main Menu, Sequence at which we want our custom transaction to appear in the menu, and the name of the transactiondeveloped by us. T3130B takes the Text and the Short text which should appear in the menu againstour custom putaway transaction. Once all this is place, you are good to go! Either directly run your transaction or navigate to it through LM00.