E3631电源SCPI收到“查询中断”错误

大家好，我正在用VISA编程，使用E3631的RS232端口进行仪器控制。
当我向电源发送查询时，有时我会收到“查询中断”错误，这种情况大约发生在50％的时间。
以下是我对错误队列的查询示例：char buf [256] = {0}; / *错误状态* / ViStatus errstat; / *初始化VISA系统* / viOpenDefaultRM（＆amp; defaultRM）; / * open DC Power
在RS-232端口上提供会话* / viOpen（defaultRM，“ASRLInstrument”，VI_NULL，VI_NULL和＆amp; vi_pwr）; viPrintf（vi_pwr，“SYST：REMOTE  n”）;
//设置远程模式//检查错误队列是否为clearederrstat = viPrintf（vi_pwr，“SYST：ERR？ n”）; if（errstat！= VI_SUCCESS）printf（“send SYST：ERR？error：％x  n”
，errstat）; errstat = viScanf（vi_pwr，“％t  n”，＆amp; buf）; if（errstat！= VI_SUCCESS）printf（“接收SYST：ERR？错误：％x  n”，errstat）; printf（
“SYST：ERR？=％s  n”，buf）;任何建议都将受到赞赏。
SCPI描述并没有真正帮助我，它说明在查询之前缓冲区中可能有数据，但我没有请求任何数据。



     以下为原文

  Hello All,
I'm programming in VISA using the RS232 port of the E3631 for instrument control. When i send a query to the power supply sometimes i get the "Query INTERRUPTED" error, this happens about 50% of the time. Here is a sample of my query of the error queue:

     char buf [256] = {0};
     /* error status */
     ViStatus errstat;
     /* Initialize VISA system */
     viOpenDefaultRM (&defaultRM);
     /* open DC Power Supply session on RS-232 port */
     viOpen (defaultRM, "ASRLInstrument", VI_NULL,VI_NULL, &vi_pwr);

     viPrintf(vi_pwr, "SYST:REMOTEn"); //set remote mode
     // Check that error queue is cleared
     errstat = viPrintf (vi_pwr, "SYST:ERR?n");
     if (errstat != VI_SUCCESS)
          printf ("send SYST:ERR? error: %xn", errstat);

     errstat = viScanf (vi_pwr, "%tn", &buf);
     if (errstat != VI_SUCCESS)
          printf ("receive SYST:ERR? error: %xn", errstat);
     
     printf ("SYST:ERR? = %sn", buf);

Any suggestion will be appreciated. The SCPI description did not really help me out, it states that there might be data previously in the buffer before the query but i have not requested any data.