Can I use "SerialDemo" or "BlackBox" to read data from hardware device?

Hi All,
I want read data comm port which is been connected with hardware device(weight reader).Can I use "SerialDemo" or "BlackBox" sample programs provided with javax.comm package?
If yes do I need to do any modification in program as per my hardware device?
Please help
Thanks in advance to all
Basavaraj

You'll need to know what data is being sent from the device, and the example code SHOULD NOT be used.
It is only to show you HOW to do it.
Following the example code, build an application that reads from that port. Read the information from the manufacturer's website to get the details about the format of the data sent.

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Do I have to use lock when I am reading data from a table

Hi,
When i am reading data from a table , do I have to set a lock on that table .
Is it necessary for us to set the lock on a table when I am reading data from the table.
When I am updating the table , do I have to set a lock on the table ?
If yes, then what sort of lock-read lock,write lock or shared lock?
Regards,
Sushanth H.S.

check it out,
Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.
SAP Provide three type of Lock objects.
- Read Lock(Shared Locked)
protects read access to an object. The read lock allows other transactions read access but not write access to
the locked area of the table
- Write Lock(exclusive lock)
protects write access to an object. The write lock allows other transactions neither read nor write access to
the locked area of the table.
- Enhanced write lock (exclusive lock without cumulating)
works like a write lock except that the enhanced write lock also protects from further accesses from the
same transaction.
You can create a lock on a object of SAP thorugh transaction SE11 and enter any meaningful name start with EZ Example EZTEST_LOCK.
Use: you can see in almost all transaction when you are open an object in Change mode SAP could not allow to any other user to open the same object in change mode.
Example: in HR when we are enter a personal number in master data maintainance screen SAP can't allow to any other user to use same personal number for changes.
Technicaly:
When you create a lock object System automatically creat two function module.
1. ENQUEUE_<Lockobject name>. to insert the object in a queue.
2. DEQUEUE_<Lockobject name>. To remove the object is being queued through above FM.
You have to use these function module in your program.
check this link for example.
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
tables:vbak.
call function 'ENQUEUE_EZLOCK3'
exporting
mode_vbak = 'E'
mandt = sy-mandt
vbeln = vbak-vbeln
X_VBELN = ' '
_SCOPE = '2'
_WAIT = ' '
_COLLECT = ' '
EXCEPTIONS
FOREIGN_LOCK = 1
SYSTEM_FAILURE = 2
OTHERS = 3
if sy-subrc 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
endif.
Normally ABAPers will create the Lock objects, because we know when to lock and how to lock and where to lock the Object then after completing our updations we unlock the Objects in the Tables
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
purpose: If multiple user try to access a database object, inconsistency may occer. To avoid that inconsistency and to let multiple user give the accessibility of the database objects the locking mechanism is used.
Steps: first we create a loc object in se11 . Suppose for a table mara. It will create two functional module.:
1. enque_lockobject
1. deque_lockobject
before updating any table first we lock the table by calling enque_lockobject fm and then after updating we release the lock by deque_lockobject.
Select the radio button "Lock object"..
Give the name starts with EZ or EY..
Example: EYTEST
Press Create button..
Give the short description..
Example: Lock object for table ZTABLE..
In the tables tab..Give the table name..
Example: ZTABLE
Save and generate..
Your lock object is now created..You can see the LOCK MODULES..
In the menu ..GOTO -> LOCK MODULES..There you can see the ENQUEUE and DEQUEUE function
Reward if helpful

Unable to read data from Analog Devices 6b11 module - error code 1240

Hi everyone,
I'm trying to read data from a thermocouple with an AD 6B11 module in an AD 6BP16-1 backplane using RS232 serial. I've been following this guide:
http://digital.ni.com/public.nsf/allkb/8C77E5E52B4A27968625611600559421
Everything seems to work out well until step 13, where I call the "AD6B Input Module - Read Data.VI". I get an error code 1240 stating something like "invalid parameter or unable to read instrument".
Has anyone got any experience with this error or suggestions to fixing it?
Thanks in advance!

That user guide is 20+ years old. The serial functions from that day used 0 for com 1, 1 for com 2, etc. Make sure you have the correct one selected. Please provide the exact error message instead of 'something like'.

How to use the readLine() method when reading data from a URL?

Hello,
I have a URL which contains text input.
The only way to get the data from this URL is by opening a URL connection to it.
I would like to get the data from this URL but at the same time I would like to be able to use readLine() method of BufferedReader in order to read the data line by line.
My question is how do I combine between these two requirements in order to reed the data from the URL?
Roy

Hello Roy,
can you try out this code.
URL yahoo = new URL("http://www.yahoo.com/");
        URLConnection yc = yahoo.openConnection();
        BufferedReader in = new BufferedReader(
                                new InputStreamReader(
                                yc.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null)
            System.out.println(inputLine);
        in.close();
Regards,
Mohan R

How can I use Hash Table when processing the data from cdpos and cdhdr

Hello Guru,
I've a question,
I need to reduce the access time to both cdhdr and cdpos.
Because may be I'll get a huge number of entries.
It looks like that by processing cdhdr and cdpos data will take many secondes,
it depends on how many data you need to find.
Hints : Putting instructions inside a form will slow down the program?
Also, I just want use Hash table and I need to put a loop-instruction going on the hash-table in form.
I know that it's no possible but I can declare an index inside my customized hash table.
For example :
DO
READ TABLE FOR specific_hash_table WITH KEY TABLE oindex = d_oindex.
Process data
d_oindex += 1.
UNTIL d_oindex = c_max_lines + 1.
Doing this would actually not necessary improve the performance.
Because It looks like I'm having a standard table, may be there's a hash function, but it could be a bad function.
Also I need to use for example COUNT (*) to know how many lines I get with the select.
FORM find_cdpos_data_with_loop
TABLES
    i_otf_objcs TYPE STANDARD TABLE
USING
    i_cdhdr_data TYPE HASHED TABLE
    i_objcl TYPE j_objnr
*    i_obj_lst TYPE any
    i_option TYPE c
CHANGING
    i_global TYPE STANDARD TABLE.
" Hint: cdpos is a cluster-table
CONSTANTS : objectid TYPE string VALUE 'objectid = i_obj_lst-objectid',
              changenr TYPE string VALUE 'changenr = i_obj_lst-changenr',
              tabname TYPE string VALUE 'tabname = i_otf_objcs-tablename',
              tabnameo1 TYPE string VALUE 'tabname NE ''''',
              tabnameo2 TYPE string VALUE 'tabname NE ''DRAD''',
              fname TYPE string VALUE 'fname = i_otf_objcs-fieldname'.
DATA : BEGIN OF i_object_list OCCURS 0,
            objectclas LIKE cdpos-objectclas,
            objectid LIKE cdpos-objectid,
            changenr LIKE cdpos-changenr,
         END OF i_object_list.
DATA : i_cdpos LIKE TABLE OF i_object_list WITH HEADER LINE,
         i_obj_lst LIKE LINE OF i_cdpos.
DATA : tabnamev2 TYPE string.
IF i_option EQ 'X'.
    MOVE tabnameo2 TO tabnamev2.
ELSE.
    MOVE tabnameo1 TO tabnamev2.
ENDIF.
*LOOP AT i_cdhdr_data TO i_obj_lst.
SELECT objectclas objectid changenr
    INTO TABLE i_cdpos
    FROM cdpos
    FOR ALL ENTRIES IN i_otf_objcs
    WHERE objectclas = i_objcl AND
          (objectid) AND
          (changenr) AND
          (tabname) AND
          (tabnamev2) AND
          (fname).
LOOP AT i_cdpos.
    APPEND i_cdpos-objectid TO i_global.
ENDLOOP.
*ENDLOOP.
ENDFORM.                    "find_cdpos_data

Hey Mart,
This is what I met, unfortunately I get the same performance with for all entries.
But with a lot of more code.
FORM find_cdpos_data
TABLES
    i_otf_objcs TYPE STANDARD TABLE
USING
    i_objcl TYPE j_objnr
    i_obj_lst TYPE any
    i_option TYPE c
CHANGING
    i_global TYPE STANDARD TABLE.
" Hint: cdpos is a cluster-table
CONSTANTS : objectid TYPE string VALUE 'objectid = i_obj_lst-objectid',
              changenr TYPE string VALUE 'changenr = i_obj_lst-changenr',
              tabname TYPE string VALUE 'tabname = i_otf_objcs-tablename',
              tabnameo1 TYPE string VALUE 'tabname NE ''''',
              tabnameo2 TYPE string VALUE 'tabname NE ''DRAD''',
              fname TYPE string VALUE 'fname = i_otf_objcs-fieldname'.
* DATA : BEGIN OF i_object_list OCCURS 0,
*            objectclas LIKE cdpos-objectclas,
*            objectid LIKE cdpos-objectid,
*            changenr LIKE cdpos-changenr,
*         END OF i_object_list.
** complete modified code [begin]
DATA : BEGIN OF i_object_list OCCURS 0,
            objectclas LIKE cdpos-objectclas,
            objectid LIKE cdpos-objectid,
            changenr LIKE cdpos-changenr,
            tabname LIKE cdpos-tabname,
            fname LIKE cdpos-fname,
         END OF i_object_list.
** complete modified code [end]
DATA : i_cdpos LIKE TABLE OF i_object_list WITH HEADER LINE.
DATA : tabnamev2 TYPE string.
** complete modified code [begin]
FIELD-SYMBOLS : <otf> TYPE ANY,
                <otf_field_tabname>,
                <otf_field_fname>.
** complete modified code [end]
IF i_option EQ 'X'.
    MOVE tabnameo2 TO tabnamev2.
ELSE.
    MOVE tabnameo1 TO tabnamev2.
ENDIF.
** SELECT objectclas objectid changenr
**    INTO TABLE i_cdpos
* SELECT objectid
*      APPENDING CORRESPONDING FIELDS OF TABLE i_global
*      FROM cdpos
*      FOR ALL ENTRIES IN i_otf_objcs
*      WHERE objectclas = i_objcl AND
*            (objectid) AND
*            (changenr) AND
*            (tabname) AND
*            (tabnamev2) AND
*            (fname).
** complete modified code [begin]
SELECT objectid tabname fname
      INTO CORRESPONDING FIELDS OF TABLE i_cdpos
      FROM cdpos
      WHERE objectclas = i_objcl AND
            (objectid) AND
            (changenr) AND
            (tabnamev2).
ASSIGN LOCAL COPY OF i_otf_objcs TO <otf>.
LOOP AT i_cdpos.
LOOP AT i_otf_objcs INTO <otf>.
   ASSIGN COMPONENT 'TABLENAME' OF STRUCTURE <otf> TO <otf_field_tabname>.
   ASSIGN COMPONENT 'FIELDNAME' OF STRUCTURE <otf> TO <otf_field_fname>.
    IF ( <otf_field_tabname> EQ i_cdpos-tabname ) AND ( <otf_field_fname> EQ i_cdpos-fname ).
      APPEND i_cdpos-objectid TO i_global.
      RETURN.
    ENDIF.
ENDLOOP.
ENDLOOP.
** complete modified code [end]
** LOOP AT i_cdpos.
**    APPEND i_cdpos-objectid TO i_global.
** ENDLOOP.
ENDFORM.                    "find_cdpos_data

Reading data from hardware

Hello,
this is the first time I use NI hardware. I have the USB-6009 unit which
runs well on NI-DAQmx (V4.5).
I'm trying to bring an input value to a Labview (V8.0.1). I know it sounds
stupid, but what must I do to measure a signal in Labview?
Best regards
Marco

Dangerous Bill wrote:
> On Apr 29, 6:35 am, Freelance Embedded Systems Engineer
> <[email protected]> wrote:
>> Before you do anything:
>> 1) plug in your usb hardware;
>> 2) open Measurement and Automation eXplorer (MAX)
>> 3) find your hardware listed on the browser on the left;
>> 4) select your hardware and run the self-test.
>>
>> Then, in Labview, under the pull-down menus, open the Examples and search for analog or digital or DAQmx. Select one of the examples there. In this dialog box, you can also make the search specific to the hardware that you have available (the USB-6009). The example should get you up and running and you can modify it from there.
>
> Thanks. I needed this too and hadn't thought to ask here. The 6008 and
> 6009 are champs for doing DAQ with little money and nondemanding
> applications, but there's always that damn steep learning curve with LV.
pain in the *ss to learn...here's some webcasts to help:
http://zone.ni.com/devzone/cda/tut/p/id/7412
http://www.lvmastery.com/TipJar2008-03-03
http://www.lvmastery.com/TipJar2008-03-13
http://www.lvmastery.com/TipJar2008-08-17
http://www.lvmastery.com/tipjar2008-10-19
http://zone.ni.com/devzone/fn/p/sn/n15:WebcastsAndVideos.WebcastsOnDemand

I have a Time Capsule with 2tb of storage, and an I-Mac with 500Gb. (which is at capacity) Can I use the Time Capsule to store data in addition to backing up the hard drive?

I have a Time Capsule with 2tb of storage, and an I-Mac with 500Gb. (which is at capacity) Can I use the Time Capsule to store data from my hard drive that I want to access later in addition to backing up the hard drive?

Can I use the Time Capsule to store data from my hard drive that I want to access later in addition to backing up the hard drive?
Yes, but if you move the "original" data on your iMac to the Time Capsule....then the "original" data is now on the Time Capsule disk.
When...not if...the Time Capsule disk has a problem, you have no backups for this data.
Perhaps a much safer plan might be to add an external hard drive attached directly to your iMac. Then, move the data to that drive from the iMac.
Now, Time Machine will back up both your iMac and the external hard drive so you have "originals" on one drive and backups on another. Would that plan work for you?

Hi experts, how to use open sql to read data from one " maintenance view"?

i want to use this part of data within report ,so how to use open sql statement to read data from one " maintenance view"?

Hi
You can't use OPEN SQl statements to fetch data from maintenance view
You have to use only Database views
see the different types of views and the difference
The followings are different types of views:
- Database View (SE11)
Database views are implement an inner join, that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Inconsistencies between primary and secondary table could, therefore, lead to a reduced selection set.
In database views, the join conditions can be formulated using equality relationships between any base fields. In the other types of view, they must be taken from existing foreign keys. That is, tables can only be collected in a maintenance or help view if they are linked to one another via foreign keys.
- Help View ( SE54)
Help views are used to output additional information when the online help system is called.
When the F4 button is pressed for a screen field, a check is first made on whether a matchcode is defined for this field. If this is not the case, the help view is displayed in which the check table of the field is the primary table. Thus, for each table no more than one help view can be created, that is, a table can only be primary table in at most one help view.
- Projection View
Projection views are used to suppress or mask certain fields in a table (projection), thus minimizing the number of interfaces. This means that only the data that is actually required is exchanged when the database is accessed.
A projection view can draw upon only one table. Selection conditions cannot be specified for projection views.
- Maintenance View ( SE54 )
Maintenance views enable a business-oriented approach to looking at data, while at the same time, making it possible to maintain the data involved. Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.
Please have a look at below link. It will help you.
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ed06446011d189700000e8322d00/frameset.htm
for more detailed info look on:
http://www.sap-img.com/abap/what-is-the-different-types-and-usage-of-views.htm
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/abap+dictionary&
Reward points for useful Answers
Regards
Anji

How do I read data from a DMM or DC Power Supply at a specified rate?

I have a PXI system with 4071 DMMs and 4110 DC Power Supplies. I want to be able to measure the power consumption of my DUT as it performs various operations. This is what my process flow looks like:
1. Configure DMM and Power Supply
2. Wait for DUT to go into a certain mode
3. Start Acquiring data from DMM and PS.
4. Wait for DUT to get out of this mode
5. Stop Acquiring data from DMM and PS.
Since the duration of step #4 is uncertain, I cannot tell the units to collect a predetermined number of samples and give it back to me. Instead I have to take readings as long as it's required.
I'm attaching screenshots of my setup and read process. The reading is done inside a timed loop which is running at 1kHz.
The problem is that using niDMM Read Multi-Point or niDCPower Measure Multiple takes 5-9ms before I get a reading, so I'm not really getting 1ms resolution in my data. I'm sure there are other folks who have had the need to read data from these devices with better time-resolution, so if anyone can point me in the correct direction, it would be great. I'm pretty sure I'm not doing the correct thing here.
Attachments:
1-Setup.PNG ‏12 KB
2-Read.PNG ‏9 KB

What is really confusing to me is why you are even using the multi-point function when you set the sample count to 1. If you want multiple points, request multiple samples and let the DMM acquire them at a rate you specify. If you want a single sample, use the normal Read. You also need to pay attention to how fast the DMM can acquire. If you want the fastest sample rates, you might be a lot better off with a DAQ board.

Reading Data from Internal Table

Hi,
Can anyone please tell me how to read data from Internal Tables in the Event Handler without using the Select statement OnInitialization?
Thanks,
Gaurav

Hi Siddhartha,
Can you tell me the problem in my code. I tried to work on the way you suggested. Though I have not finished with the coding, I just wanted to know whether I am going in the direction or not.
I have declared the the structure in Type Defination as
TYPES: BEGIN OF TEST_STRUC,
         BEGDA TYPE BEGDA,
         ENDDA TYPE ENDDA,
       END OF TEST_STRUC.
TYPES: TEST_TAB_TYPE TYPE TABLE OF TEST_STRUC.
In the Event Handler, I have added the following code on OnInputProcessing:
event handler for checking and processing user input and
for defining navigation
DATA TEST_INFO LIKE LINE OF TEST_TAB.
DATA: MYTAB6 TYPE TABLE OF PA0006,
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REFRESH TEST_TAB.
CLEAR TEST_INFO.
MYTAB6_WA-BEGDA = REQUEST->GET_FORM_FIELD( STARTDATE ).
MYTAB6_WA-ENDDA = REQUEST->GET_FORM_FIELD( ENDDATE ).
IF EVENT->NAME EQ 'button'
   AND EVENT->SERVER_EVENT EQ 'click'.
LOOP AT MYTAB6 INTO MYTAB6_WA.
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    TEST_INFO-ENDDA = MYTAB6_WA-ENDDA.
ENDLOOP.
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CLEAR TEST_INFO.
NAVIGATION->SET_PARAMETER( NAME = 'test_tab'
VALUE = 'begda' ).
NAVIGATION->SET_PARAMETER( NAME = 'test_tab'
VALUE = 'endda' ).
NAVIGATION->GOTO_PAGE( 'MyBSP2.htm').
ENDIF.
P.S. MyBSP2.htm is my next page.
Thanks,
Gaurav

Reading Data from serial (Comm) Port in developer200 forms 6i

Dears,
I have developed an application using Dev2k forms 6i.
I need to read data from a device (weigh bridge) that is attached to PC on comm port.
scenario: when a vehicle comes on the Weigh bridge it calculates its weight and send it to the PC on serial port.
on when-button-pressed event I want to get data into a text field on form.
If any one has developed such form please help me.
Thanks and regards

you can:
create java class -> wrap plsql -> invoke plsql-code from button trigger
googling java class instead of creating =)

Reading data from flat file in aplication server

hi all,
can any body provide code how to read data from flat file which is in application server.
thanks in advance

hi,
chk this sample code.
parameters: p_file like rlgrap-filename obligatory
default '/usr/sap/upload.xls'.
types: begin of t_data,
vbeln like vbap-vbeln,
posnr like vbap-posnr,
matnr like vbap-matnr,
werks like vbap-werks,
megne like vbap-zmeng,
end of t_data.
data: it_data type standard table of t_data,
wa_data type t_data.
open dataset p_file for output in text mode encoding default.
if sy-subrc ne 0.
write:/ 'Unable to open file:', p_file.
else.
do.
read dataset p_file into wa_data.
if sy-subrc ne 0.
exit.
else.
append wa_data to it_data.
endif.
enddo.
close dataset p_file.
endif.
Rgds
Anver

Reading from Hardware Devices

i want to develop an application that reads data from a device like a microphone and stuffs. Right now, i do not know where to start from and how to start. i will very much appreciate advices,assistance and suggestion from u guys.
joe...

thanks for your response. How do i convert the database into binary. One of the things bugging me is how to locate the device i want to read data from.
joe.

Help Required -- Can we use SQL Query to READ data from SAP MDM Tables

Hi All,
Please help.........
Can we use SQL Query to READ(No Creation/Updation/Deletion just Read) Data from SAP MDM tables directly, without using MDM Syndicator.
Or direct SQL access to SAP MDM tables is not possible. Only through MDM Syndicator can we export data.
Thanks in Advance
Regards

All the tables you create in Repository comes under A2i_CM_Tables in Database named as your repository name. So the tables names are fields of table A2i_CM_Tables. Now i tried it but cant make it.
Now, I dont think its possible to extract all fields in tables and there values using select query. May be pure sql guy can do that or not.
But there is no relation of data extraction and syndicator. Data is viewed in Data Manager. and you can also store data in a file from DM also.
BR,
Alok

Can i use java mail APIs to read Unix mail

hi
can i use java mail APIs to read Unix mail?
Unix has "mail" command which can be used to access mails on the Unix system.
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thanks in advance

There are JavaMail providers that allow you to access the Unix mail spool files directly. Alternatively the standard JavaMail API can access a POP or IMAP server, if one is installed.

Can I use "SerialDemo" or "BlackBox" to read data from hardware device?

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