怎么通过串行编程3300A直流电子负载

我试图通过串口与3300A直流电子负载设备进行通信。我已经验证设备和我的计算机的设置是否匹配。我已经验证我的计算机正在发送串行命令。当我发送任何命令时，即
* IDN或SYST：REM在我的串口软件中没有得到任何响应回复。如果SYST：REM命令功能正常，它应该禁用所有前面板按钮（LOCAL按钮除外）并且任何前面板按钮都不应该被按下
响应。因为他们做出回应，我假设SYST：REM命令不起作用。如果这是错误的论坛，我找不到我的设备。任何帮助将不胜感激。



     以下为原文

  I am trying to communicate to a 3300A DC electronic load device over the serial port.
I have verified that the settings of the device and my computer match.
I have verified that my computer is sending the serial command.
When I send any command, i.e. *IDN or SYST:REM
I get no response echoed back to me in my serial software.
If the SYST:REM command functioned correctly, it should disable all the front panel buttons (except the LOCAL button)
and any front panel button pushed should not respond.
Since they do respond, I am assuming the SYST:REM command did not work.

Sorry if this is the wrong forum, I could not find one for my device.

Any help would be appreciated.