GPIB_Demo

#include "stdafx.h"


/*idn.c
This example program queries a GPIB device for an identification string 
and prints the results. Note that you must change the address. 
*/
#include 
#include "C:\Program Files\IVI Foundation\VISA\WinNT\agvisa\include\visa.h"
#pragma comment(lib,"C:\\Program Files\\IVI Foundation\\VISA\\WinNT\\agvisa\\lib\\msc\\agvisa32.lib")


#include 
void main () {
    
    ViSession defaultRM, vi;
    char buf [256] = {0};
    
    
    /* Open session to GPIB device at address 22 */
    viOpenDefaultRM (&defaultRM);
    viOpen (defaultRM, "GPIB0::22::INSTR", VI_NULL,VI_NULL, &vi);
    
    /* Initialize device(Reset) */
    viPrintf (vi, "*RST\n");
    
    /* Send an *IDN? string to the device */
    viPrintf (vi, "*IDN?\n");
    
    /* Read results */
    viScanf (vi, "%t", &buf);
    //viQueryf(vi, "*IDN?\n","%t",%buf);//上两条语句可用此条代替
    /* Print results */
    printf ("Instrument identification string: %s\n", buf);
    //信号源---特定的信号源可能命令不一样，需要参考编程文档
    int freq=999;
    viPrintf(vi, "FREQ %dMHz\n",freq);
    viPrintf(vi, "POW  0dBm\n");
    viPrintf(vi, "OUTP ON\n"); //RF ON
    viPrintf(vi, "MOD ON\n");  //调制开
            //频谱仪 
            viPrintf(vi, "SYST:DISP:UPDate ON\n");//屏幕显示，不显示速度较快
    viPrintf(vi, "FREQ:CENT 999MHz\n");
    viPrintf(vi, "FREQ:SPAN 10MHz\n");
    viPrintf(vi, "CALC:MARK:AOFF\n");
    viPrintf(vi, "SWE:TIME 2s\n");//扫描时间
    viPrintf(vi, "SYST:PSAVE ON\n");//省电模式
    viPrintf(vi, "DISP:TRAC:Y:RLEV 10dBm\n");
    viPrintf(vi, "DISP:WIND:TRAC:Y:RLEV:OFFS 10dB\n"); 
    viPrintf(vi, "CALC:MARK:X 999MHz\n");//MARK ON
    viPrintf(vi, "BAND:RES 100kHz\n");//RBW
    viPrintf(vi, "BAND:VID 300kHz\n");//VBW   
    //自动校准需要单次扫描，连续扫描不准确   
    viPrintf(vi, "INIT:CONT OFF\n");
    //WAI用于同步，还有OPC等也可用于同步,仅用于overlapping command，sequential command
    //无用，不过用
    viPrintf(vi, "INIT:IMM;*WAI\n");
    viPrintf(vi, "CALC:MARK:MAX\n");
    //读取mark的值
    viQueryf(vi, "CALC:MARK:Y?\n","%t",buf);  
            printf("The mark value is:%s.\n",buf);
    //功率计
    viPrintf(vi, "SENS:CORR:OFFS 31\n");//外部补偿电平 db!!!!ok
    viPrintf(vi, "DISP:TRAC:VCENT 55dBm\n");//参考电平 
    viPrintf(vi, "TRIG:LEV 40dBm\n");//触发电平 dBm
    viPrintf(vi, "TRIG:DEL 0\n");//触发事件位置us   ns/div us/div ms/div
    viPrintf(vi, "DISP:PULS:TIMEBASE 10us\n");//时间单位 (moren s) 100us
    viPrintf(vi, "DISP:TRAC:VSCALe 5dB\n");//db/格  db dBm,dBV,dBmV,dbuV dBuV
    //网分仪
    viPrintf(vi, "SYST:DISP:UPDate ON\n");
    viPrintf(vi, "SWE:COUnt 12\n");
    viPrintf(vi, "CALC:PAR:SEL 'CH1_S11_1'\n");
    viPrintf(vi, "CALC:PAR:DEF 'My_S11',s11\n");
    //////
    viPrintf(vi, "CALCulate1:PARameter:SELect 'Ch1Trc2' 'S21'\n"); 
    viPrintf(vi, "SYST:DISP:UPDate ON\n");
    viPrintf(vi, "CALC:FORM PHAS\n"); 
    viPrintf(vi, "FORMat ASCII\n");
    viQueryf(vi, "INITiate1:CONTinuous OFF;*OPC?\n","%s", buf);
    viPrintf(vi, "SENS1:FREQ:STAR 1000MHz\n");
    viPrintf(vi, "SENS1:FREQ:STOP 1125MHz\n");
    viPrintf(vi, "SENS1:SWE:POIN 126\n");
    viPrintf(vi, "OUTP1  OFF\n");
    viPrintf(vi, "SOUR:POW -7\n");
    viPrintf(vi, "CALC1:MARK1 ON\n");
    //////////////////////////////////////////////////////
    /* Close session */
    viClose(vi);
    viClose(defaultRM);
    while(1);//pause for see the result.
}


//只是调用API(头文件visa.h,库agvisa32.lib)，API常用的就是几个，
//viOpenDefaultRM，viOpen，viPrintf，viQueryf，viClose ,,,
//还有viSetAttribute,viScanf,
//主要是SCPI命令，大多是标准化的，查查文档即可。
/*  自动搜索仪器，根据*IDN知道什么仪器
ViChar buffer[255];
ViRsrc mathes=buffer;
ViUInt32 nmatched;
ViFindList list;

viFindRsrc(defaultRM,"GPIB?*INSTR",&list,&nmatched,
matched);
viFindNext(list,matches);
viFindNext(list,matches);
...
viClose(list);
//*/