通过 rs232 使用 pyvisa 控制仪器（keithley2400）， query 和 read 无响应，但是可以通过 write 进行控制

pyvisa 是 1.8 python 是 3.6.3 操作系统为 win10 64

google 的结果一般是波特率和 terminator （命令结束标志符号）设置的问题波特率需要统一和 terminator 需要设置为 /r /自己摸索着设置了一下还是一样的错误希望大家能够一些建议谢谢！

代码 import visa import time rm=visa.ResourceManager() print(rm.list_resources()) A=rm.open_resource("ASRL5::INSTR") A.timeout=25000 print(A.query('*IDN? ' )) #A.write_termination = '\r' #A.read_termination = '\r' #A.timeout=25000 #A.write("*RST") #A.write(":SENSE:FUNCTION 'RES'") #A.write(":FORMAT:ELEMENTS RES") #A.write(":OUTPUT ON") #for i in range(1,5): #A.write(":READ?") #data = A.read("TRACE:DATA ") #print(data)

编译器反馈 ('ASRL1::INSTR', 'ASRL5::INSTR', 'ASRL4::INSTR') Traceback (most recent call last): File "E:/2018261630/18261631.py", line 7, in <module> print(A.query('*IDN? ' )) File "C:\Python\lib\site-packages\pyvisa\resources\messagebased.py", line 407, in query return self.read() File "C:\Python\lib\site-packages\pyvisa\resources\messagebased.py", line 332, in read message = self.read_raw().decode(enco) File "C:\Python\lib\site-packages\pyvisa\resources\messagebased.py", line 306, in read_raw chunk, status = self.visalib.read(self.session, size) File "C:\Python\lib\site-packages\pyvisa\ctwrapper\functions.py", line 1582, in read ret = library.viRead(session, buffer, count, byref(return_count)) File "C:\Python\lib\site-packages\pyvisa\ctwrapper\highlevel.py", line 188, in _return_handler raise errors.VisaIOError(ret_value) pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.

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