string - LabVIEW字符串输出

Question

如何使用 LabVIEW 从​​ DAQ 板 (NI- USB 6259) 发送字符串输出？我想使用LabVIEW向恒电位仪设备发送诸如“CELL 0”或“READ”之类的命令。

谢谢

Answer 1

6259 不做字符串输出。它是一种数据采集板，用于读取/获取模拟电压或发送/接收单个数字信号。它不是通讯设备。

如果你真的想向这个设备发送字符串，你可能需要一个更像RS-232或GPIB连接的东西。

Answer 2

As eaolson said a DAQ is not intended to control devices. However it is an interesting project to enter the guts of the communication protocol. Doing it with a DAQ would require to:

• Identify the protocol (GPIB or RS-232)
• Make your cable from the DAQ output connector
• For each command, generate the waveform in LabVIEW, by using the letters' ASCII code, stop bits, etc. This is the funniest part (INMHO, but I understand it's not everybody!)
• Send it (using DAQ analog write VIs, you should find many examples for this)
• The oscilloscope will be your best friend