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GW INSTEK LCR819 LabVIEW Driver

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Hi Everyone on the forum

 

     I'm looking for the LabVIEW Driver for a GW Instek LCR 819.

     I had been looking over ther internet with no luck,  even the vendor doesn't have it

     Wonder why?

 

     Currently working on  ATE  for an  Oil Level Senor (Aerospace)

 

    Does any one use it before...   LabVIEW 2012

 

     Best Regards

 

Ing. Reynaldo Lima Villarreal
Ingenieria Electronica (I N G E L)
Reynosa, Tamps. México

Cel: +52 899 160-52-59
Email: reynaldolima@aol.com
Message 1 of 22
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I don't see a driver from GW Instek either but I took a brief look at the programming manual. It should be pretty simple to write a driver for this. The command list is short and appears well documented. There are tools for developing drivers at http://www.ni.com/downloads/instrument-drivers/. Developing a driver is not as hard as you might think.

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Message 2 of 22
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       Hi Dennis.

       Thanks for the reply..

 

       I already read the user manual fot the LCR,  I saw the commands.   I have hook up a null modem cable with a USB to RS232 adaptor (im using a laptop for

       developping stage)  I had been sending the COMU? commnad to see if the LCR answer back but nothing..

   

       Do you thing the USB to RS232 works OK.   I had problem using the USB adator to talk to DMM HP34401A, I didn't work,  DMM don't like USB adaptor,

       need to install a 2 RS232 PCI card to make them  work..  

 

       Take a look to the image attach.

 

        Best Regards.

Ing. Reynaldo Lima Villarreal
Ingenieria Electronica (I N G E L)
Reynosa, Tamps. México

Cel: +52 899 160-52-59
Email: reynaldolima@aol.com
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Message 3 of 22
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The first thing I noticed is that you are not sending any termination character after the command. Also, make sure that it really is a null-modem cable that is required.

 

I've had great success with USB-RS232 converters that use the FTDI chipset. 

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Message 4 of 22
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            Thanks..

             I will check the  termination character..

 

             I'm using  FTDI Chipset also,    USB-RS232-WE-1800-BBT_0.0  (Wire end Version)   You did not connect  the black and red cable,  we don't need this

             for RS232?    only four cables?

 

             Best Regards.

Ing. Reynaldo Lima Villarreal
Ingenieria Electronica (I N G E L)
Reynosa, Tamps. México

Cel: +52 899 160-52-59
Email: reynaldolima@aol.com
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Message 5 of 22
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      Like this?

      the cable us null modem,  I test the cable with a Agilent PS. and same USB to RS232 converter...

 

       I'm missing something else...

 

        Thanks

      

     

Ing. Reynaldo Lima Villarreal
Ingenieria Electronica (I N G E L)
Reynosa, Tamps. México

Cel: +52 899 160-52-59
Email: reynaldolima@aol.com
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Message 6 of 22
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   Hi Again..

 

         I'm not having any luck talking to the LCR,   

         I send the command,  No answer,  No error either...

 

         I saw the commands, there are not complicated.  but can't stablish communucation

 

        Thanks.

 

Ing. Reynaldo Lima Villarreal
Ingenieria Electronica (I N G E L)
Reynosa, Tamps. México

Cel: +52 899 160-52-59
Email: reynaldolima@aol.com
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Message 7 of 22
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That is not the correct way to send termination characters. The basic example is set for '\' Code Display. You have to send the characters as that or on the block diagram, append them with string constants. Use can set a string constant for Normal, '\' Code. or Hex. Find the '\' Code or hex value of the termination characters.

Message 8 of 22
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           I'm a litte confuse right now..

      

           I have set the window as Normal display  and send  COMU?.   

           But you mean to add  "\" constant...?

 

           Getting frustated...  all day with same issue...

 

            Thanks for your help..

 

Ing. Reynaldo Lima Villarreal
Ingenieria Electronica (I N G E L)
Reynosa, Tamps. México

Cel: +52 899 160-52-59
Email: reynaldolima@aol.com
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Message 9 of 22
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Solution
Accepted by topic author Rlima

You need to add a termination character(s) to the command string. Setting the display to Normal does not allow you to append any special characters. The default of '\' Codes display does allow for special characters. For example \r for carriage return or \n for a new line. The termination characters for your instrument are a bit odd. Instead of trying to use '\' Codes, it may be easier for you to use the concantanate string function on the block diagram to append the termination characters as a string constant. I would suggest setting this string constant to hex display or using a U8 array to enter the decimal/hex values of the termination character and then a Byte Array to String.

 

Before doing all of this, have you tested communication with a terminal emulation program such as Hyperterminal?

 

Edit: I should have looked up those scan codes before answering. A ctrl J is a line feed (\n) and ctrl M is carriage return (\r) so return the string control to '\' Codes and add \n\r. You could also try \r\n.

Message 10 of 22
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