programming Agilent N5242A throgh VISA command using LAN

[568]

hi,

I'm trying to program Agilent N5242A throgh VISA command using LAN with no success.

The connection to the N5242a is working but when I'm using the visaWrite command it doesn't response.

I used Agilent "connection Expert tool" and it worked.

I tried to use Measurment & automation but there is no LAN option there, I have version 4.5.

This is what I tried to do:

status = viOpenDefaultRM (&defaultRM);
   if (status < VI_SUCCESS)
   {
      printf("Could not open a session to the VISA Resource Manager!\n");
      exit (EXIT_FAILURE);
   }

   /* Now we will open a session via TCP/IP to ni.com */
   //status = viOpen (defaultRM, "TCPIP0::ftp.ni.com::21::SOCKET", VI_NULL, VI_NULL, &instr);
   status = viOpen (defaultRM, "TCPIP0::169.254.73.18::5025::SOCKET", VI_NULL, VI_NULL, &instr);
   if (status < VI_SUCCESS)
   {
      printf ("An error occurred opening the session to TCPIP0::ftp.ni.com::21::SOCKET\n");
      viClose(defaultRM);
      exit (EXIT_FAILURE);
   }
  
   viSetAttribute (instr, VI_ATTR_TCPIP_NODELAY, VI_TRUE);
  
  // status = viWrite (instr, "INIT:CONT ON", 13, &count);
      status = viWrite (instr, "*RST",4 , &count);
      status = viWrite (instr, "SENSe1:FREQuency:STARt 4000000000", 33, &count);
      status = viWrite (instr, "SENSe1:FREQuency:STOP 7000000000", 32, &count);

Best Regards

Israel

[jjp377]

In MAX did you try under Devices and Interface (right-click) to Create New VISA TCP/IP Resource?

http://zone.ni.com/devzone/cda/tut/p/id/10108

[Makoto]

TCPIP SOCKET (or SCPI-Raw) connection normally requires termination code (Line Feed, 0x0A) being sent, but not found in your viWrite() call.

Write as like:

status = viWrite (instr, "*RST\n", 5, &count);

Also I think viPrintf() will be easier than viWrite() for ASCII write, because you dont have to specify the byte-length to send. Once you set buffer operation attributes like below:

status = viSetAttribute( instr, VI_ATTR_WR_BUF_OPER_MODE, VI_FLUSH_ON_ACCESS);
status = viSetAttribute( instr, VI_ATTR_RD_BUF_OPER_MODE, VI_FLUSH_ON_ACCESS);

then you can now use viPrintf() like below:

status = viPrintf( instr, "SENSe1:FREQuency:STOP %ld\n", (ViInt32)7000000000);