BUILDING A SERIAL RS-232 TO GPIB CONVERTER

I am using an agilent hp-8648B signal generator and a hp-E4403B spectrum analyzer,both of them have a GPIB connector only.
I want to control them by the serial connection-so I need to build a VI to connect by the serail and I need hardware to convert from the serial connection to the GPIB.
Anybody have and idea how to do that? or reference to schematics of this circuit and software if needed?
Thanks
Tzviel

And may I inquire as to the serial number of your LabView software? After all it is cheaper to....
With all that high ticket Agilent equipment, a few hundred bucks for a GPIB card is a drop in the bit bucket.
Just my rant, but why expend all that time building someone else's design, doing PWA artwork, debugging, writing drivers, etc.
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
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Need to build communication redundancy using serial RS-232 for Data Transfer b/w Host and RT irrespective of TCP/IP Data Transfer

Hi - I would like to build the logic in which it should accomodate the communication redundancy using serial RS-232 for Data Transfer b/w Host and RT irrespective of TCP/IP Data Transfer.
I want to do data transfer b/w host and RT through RS232 VISA portal whenever TCP/IP ethernet cable has been unplugged from the controller continuosly , it should keep on checking for TCP/IP link re-establishing also , when ever the tcp/ip link established again that time the communication should be using in that link only. This is accomplished by deploying the RT vi as execuatbale file. I made some logic regards to the above said logic , bur it was not working as much I expected.
I request you to go through the attached two VI's and let me know , what I did wrong in that,
Please do the needful.
Attachments:
TCP_Serial_Host.vi ‏33 KB
TCP_Serial_RT.vi ‏41 KB

even i am new to this topic and i am trying to get familiar with these protocols
refer to tcp server/client examples in labview examples

When trying to work with Agilent 34401A multimeter (serial RS-232 connection), HP34401A Getting Started.vi gives always the message: "Error 1073807369 occurred at Old VISA Open ".

Baud rate and parity are set correctly, RS-232 cable is also connected correctly. My QuickBasic program has no problems to read and write to the Multimeter. It is obviously a software problem: the same error is persistent if I disconnect RS-232 cable.
I downloaded NI-VISA 2.6 for Windows 95/98/NT/ME/2000/XP frorm digital.ni.com and installed it. But it did not help.
Thank you in advance
Best regards
Alexei Soloviev

Hi Steve
I have problems with the 34401A and serial communication. Do you remember
where the error was in the code ?
Thanks
Klaus
wrote in message
news:[email protected]..
> Alexei,
> This may or may not help, I was tasked to do something similar
> recently and found an error in their driver. The GPIB VISA worked
> fine, but when I tried it on serial it played up. There was an errant
> carriage return (or CR/LF I can't remember). GPIB liked one and Serial
> liked the other. It always amuses me that we never have problems with
> Quickbasic!.
> If you want me to dig deeper give me a shout.
>
> Steve Watts
>
> On Thu, 24 Jan 2002 06:16:55 -0800 (PST), "Alexei V. Soloviev"
> wrote:
>
> >When trying
to work with Agilent 34401A multimeter (serial RS-232
> >connection), HP34401A Getting Started.vi gives always the message:
> >"Error 1073807369 occurred at Old VISA Open ".
> >
> >Baud rate and parity are set correctly, RS-232 cable is also connected
> >correctly. My QuickBasic program has no problems to read and write to
> >the Multimeter. It is obviously a software problem: the same error is
> >persistent if I disconnect RS-232 cable.
> > I downloaded NI-VISA 2.6 for Windows 95/98/NT/ME/2000/XP frorm
> > digital.ni.com and installed it. But it did not help.
> >Thank you in advance
> >Best regards
> >Alexei Soloviev
>

Connecting hp 8508a vector voltmeter with agilent 82357a usb/gpib converter

Hello
For my experiment, I need to connect to a HP 8508A vector voltmeter by using an agilent 82357A usb/gpib converter. I have a serious problem about communicating with my device using NI-VISA. I tried to do the steps indicated at following links which were indicated at the forum posts by people using 82357A:
http://digital.ni.com/public.nsf/allkb/F7C187DBF09EBE1186256F550065BD32?OpenDocument,
http://digital.ni.com/public.nsf/websearch/3B3626D9C1F999218625694200791AD7?OpenDocument,
http://cp.literature.agilent.com/litweb/pdf/5990-3731EN.pdf?cmpid=1273CN.
The version of MAX is 4.3.0f0 and i am using labview 8.5 with NI-VISA 8.2. I am trying to configure my 82357A using agilent io libraries suite 14.1.
First, I tried to configure my usb/gpib controller using agilent connection expert and set the visa interface id to GPIB6 and connect to the 82357A without any problems. Then I connect this gpib converter to my vector voltmeter. The gpib adress of the voltmeter was 6(gpib address of the interface converter was 10) so visa address GPIB6::6::INSTR was assigned to voltmeter by connection expert. I tried to connect to the voltmeter from the connection expert by using the agilent interactive IO. Send *IDN? command and took the proper response from the voltmeter. The voltmeter went into remote mode and I tried to read the voltage values by using the FETCH? command of the device and got the voltage properly which means I successfully connected to the device.Then I went to MAX and enabled the NIVISATulip.dll and restarted the MAX. Then I went back to agilent connection expert and checked the box: "use agilent 488 library where possible" for side-by-side communication between the NI and agilent visa. By the way agilent visa was installed as the secondary library. Then when I went back to MAX, I start to see the voltmeter under miscellaneous VISA resources with the address GPIB6::6::INSTR. But the problem started here. When I tried to send commands from MAX to voltmeter with the "open visa test panel" I encountered an error which exactly says:"unable to open session to GPIB6::6::INSTR, return status code:0xBFFF009E, status name:VI_ERROR_LIBRARY_NFOUND, a code library required by VISA couldn't be located or loaded." As I said before i enabled the libraries of agilent 488 from the options of the agilent connection expert. When I went back to connection expert and unchecked the box for using agilent 488 libraries nothing changed. Also when I went to NI-VISA interactive control I couldn't see my device under the tab of VISA I/O.
I tried to read some posts from this forum. People are using this usb/gpib converter successfully without any problems by performing the steps I have done. I have some questions about possible subtle points specific to my application.
First question is according to the manual of the voltmeter(this is an old device by the way from 1988):"vector voltmeter is capable of remote operation via the HP-IB which is HP's implementation of IEEE standard 488.1 "So, what I understand from this sentence is my device is communicating remotely with IEEE standard 488.1 and not 488.2 Does it make any problem? What kind of modifications should I do to my setup for overcoming this if it creates any problems? As I said before I was communicating with device very properly from the agilent connection expert. In manual there is also a sentence like "HP-IB commands used in the vector voltmeter conform to the standards set by document IEEE 488.2 1987."
Second question is should I install newer versions of agilent io libraries suite or MAX or NI-VISA. I wrote the versions I am using before are they compatible? Where can I install newer versions? As I know the newest version of the agilent io libraries suite is 15.1 or 2. Is is compatible with 82357a?(maybe I should ask this question to agilent people)
Third question I don't remember how I did it but agilent visa is indicated as secondary visa resource in agilent connection expert(I think I did it while installing agilent io libraries suite.) . How can I switch between NI and agilent visa as primary visa resource? Do you think think this will help?
I terribly need measurements from this set up and really appreciate your help if possible.
Sincerely
Caglar Yavuz, University of Michigan,Ann Arbor,EECS department.

Caglar,
The documents you mention ahould include the proper prcedure for using this hardware in LabVIEW. Here are my recommendations:
The version of NI-VISA you mentioned is not valid. The most recent version is 4.6.2. I would recommend ugrading if you do not have this version. After the upgrade,ensure that tulip is enabled as well as the other settings and see if this helps.
When talking about the instrument, the biggest concern that usually is relevant with 488.1 is that it will not respond to *IDN?. In your case, it looks like it does, and should work as 488.2 is backwards compatible. It seems to me, the issue is still with the 82357A, and we have not yet reached the voltmeter.
In order for NI-VISA to work with your device, NI-VISA must be the primary visa driver.
Hope this helps, let us know how the upgrade turns out. If you continue to have issues, take some screenshots of the preferences in MAX and upload them on the forum.
Regards,
Peter Flores
Applications Engineer

Serial rs-232

I have Keithley 6514 and trying to get data over rs-232. If you have same Labview VIs which cab be can modified, please send it to me. This VI will help me to get current data taken. Thanks.
S. Saygi

I still having problem. I wrote my VI and it seems to me ok. Basically, when I run it after reset the instrument and the VI it gives me the word following.’’ KEITHLEY INSTRUMENTS INC.,MODEL 6514,0893334,A07 Nov 29 2000 11:08:20/A02 /? ’’. But in the second run ıt gives me the time error. Meaning that I can communicate with the instrument. How can I read the correct values from the buffer through the serial rs-232? I run the loopback.vi that having no problem.
In the VI, the read character is *IDN and termination is done by \r .Timeout value on VISA CONFIGURE SERİAL PORT is 500ms.
On the other hand my serial connection is done by HAND MADE cable that ıt has all pins go trougth like 1 to 1, 2 to 2 ....
Attachments:
screenLook.doc ‏76 KB

Is there a Labview Chroma6310 driver that works with serial port instead of GPIB?

The driver that I have downloaded from NI site is based on GPIB, I need to run it via serial port. I don't have GPIB board. I am pretty new in NI world. How easily can I convert the GPIB driver to serial port (ASRL)? Has anybody already done this? Any help on this is highly appreciated.
Best regards,
Farsh

I haven't looked at the driver and I'm not familiar with the instrument but the conversion should be pretty simple. If it uses VISA for the GPIB communication, the conversion is already done. VISA works with both GPIB and serial - just use the name of the serial port as the VISA reference name. This would be ASRL1 or Com1. If it's an older driver with the traditional GPIB calls, then replace every instance of GPIB Write and GPIB Read with VISA Write and VISA Read. You might also have to add some line terminator like CR/LF to every write. There are a lot of instrument drivers that are compatible with both serial and GPIB. The HP34970 is one that comes to mind. You might want to look at it to see how to do it yourself.

Rs-232 to USB converter trouble

Hi, everyone
I have developed an application in labview 6.1 for communicating with an instrument via serial port, using serial compatibility VIs. the software works ok in the development machine which has a rs-232 port, but i can´t make it start in other PCs using USB to RS-232 converters (since they don´t have a serial port, only USB). I simply can´t stablish communications, BUT if I open hyperterminal (just open it, i don´t send any commands or anything else) and then close it again, the application in labview works ok!!! it´s just like hyperterminal "wakes up" my instrument! does anybody has any idea how can hyperterminal do this???

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Paolo
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We are considering to choose the GPIB card or usb-gpib converter for control o

ur two instruments:spectrum analyzer and signal generator,questions:1.would you pls provide the checklist for the set up?2.why your product seems more expensive than agilent GPIB card or convert?3. we want to use Labwindows/CVI to develope the application.4.if we need to buy the gpib-connector? how much we should totally spend if on GPIB card solution or USB-GPIB Conveter solution?
5.Agilent 82357A is cheaper than your product?I do not know why?if you product price include the driver while they don't,if we use convert,is it need to use driver also?

ur two instruments:spectrum analyzer and signal generator,questions:1.would you pls provide the checklist for the set up?2.why your product seems more expensive than agilent GPIB card or convert?3. we want to use Labwindows/CVI to develope the application.Liu,
I believe I can answer a few of your questions. If you would like to speak to an NI Technical Sales Representative for some of the parts that I am not able to answer, please call 888-280-7645. To connect to your instruments, you will need:
1. A GPIB interface (either a PCI solution, USB solution, or some other interface card)
2. A GPIB cable for each device (this depends somewhat on the distance between them as there are certain distance ratings on GPIB cables
Drivers are included with the purchase of the GPIB interface (the ethernet GPIB interface requires a separate license for its driver, but the USB and PCI versions are downloadable off of NI's website).
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I'm trying to locate a product manual for an "older" style GPIB to RS232 converter box. The part number on the box is GPIB-232CT.64K (180450-01 Rev B2).

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BUILDING A SERIAL RS-232 TO GPIB CONVERTER

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