发送34401A命令时出错

大家好，我正在尝试将我的PC连接到34401A trhough SPCI命令（RS232）。
我发送一些命令没有问题，如SYST：REM，SYST：LOC，* RST等。当我发送这些命令时，万用表的工作结果如此。
我的问题是关于需要答案的命令，例如，如果我发送命令“MEAS：VOLT：DC？10,0.001”，则出现值为-410的错误，每个需要答案的命令都具有相同的结果（
“* IDN？”，“CONF？”等）。
用户手册解释了此错误是：查询中断接收到一个命令，该命令将数据发送到输出缓冲区，但输出缓冲区包含来自先前命令的数据（之前的数据未被覆盖）。
电源关闭或执行* RST（复位）命令后，输出缓冲区将被清除。
所以我在命令之前应用了一个复位（即使是一个清晰的（“* CLS”））。
我遵循的步骤是：SYST：REM * RST * CLS MEAS：VOLT：DC？
10,0.001（或任何需要回答的命令）我也尝试过：* RST * CLS SYST：REM * RST * CLS MEAS：VOLT：DC？
10,0.001（或任何需要答案的命令）和许多不同的组合有人知道发生了什么？
你知道我该怎么办？
非常感谢！



     以下为原文

  Hello everyone,

I am trying to connect my PC to a 34401A trhough SPCI commands (RS232). I have no problems to send some commands as SYST:REM, SYST:LOC, *RST, etc. When I send these commands the multimeter works in consequence. My problem is about commands which required a answer, for example, If I send the command "MEAS:VOLT:DC? 10,0.001" an error appears with a value of -410, every command which required an answer has the same result ( "*IDN?", "CONF?", etc). User manual explains that this error is:

Query INTERRUPTED
A command was received which sends data to the output buffer, but the
output buffer contained data from a previous command (the previous
data is not overwritten). The output buffer is cleared when power has
been off, or after a *RST (reset) command has been executed.

So I apply it a reset (Even a clear too ("*CLS") ) before the command. The steps I follow are:

SYST:REM
*RST
*CLS
MEAS:VOLT:DC? 10,0.001 (Or any command wich  requiered an answer)

I've tried also:

*RST
*CLS
SYST:REM
*RST
*CLS
MEAS:VOLT:DC? 10,0.001 (Or any command wich  requiered an answer)

And a lot of different combinations


Someone know what's happening?? Do you have any idea what should I do?  

Thank you so much!