Programmin​g Agilent N5242A throgh VISA command using LAN

Question

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:OCKET", VI_NULL, VI_NULL, &instr);
   status = viOpen (defaultRM, "TCPIP0::169.254.73.18::5025:OCKET", VI_NULL, VI_NULL, &instr);
   if (status < VI_SUCCESS)
      printf ("An error occurred opening the session to TCPIP0::ftp.ni.com::21:OCKET\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:FREQuencyTARt 4000000000", 33, &count);
      status = viWrite (instr, "SENSe1:FREQuencyTOP 7000000000", 32, &count);
Best Regards
Israel
Best Regards
Boris

Answer 1

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:FREQuencyTOP %ld\n", (ViInt32)7000000000);