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我使用实验室自动化的Keithley 2230三通道的直流电源与PyVISA。我想选择特定的通道并相应地设置电压。我附加了程序以及错误。
我做了以下的研究,但我没有成功。
PyVISA SCPI commands and queries (issue with value update)
Python SCPI avoiding fixed delays (synchronization issue)
计划:
import visa
rm = visa.ResourceManager()
str = 'USB0::0x05E6::0x2230::9102008::INSTR'
inst = rm.open_resource(str)
print inst.query("*IDN?")
######### print the selected channel ##########
print inst.query("INSTrument:SELect?")
######### selected the perticular channel ##########
print inst.query("INSTrument:SELect 2")
命令我从吉时利DD电源的官方链接了:
http://assets.tequipment.net/assets/1/26/Documents/Keithley/2220_30_1/2220_30_1_doc_4.pdf
输出日志:
Keithley instruments, 2230-30-1, 9102008, 1.15-1.04
CH1
Traceback (most recent call last):
File "C:/Users/PycharmProjects/trails/keithley2230.py", line 9, in <module>
print inst.query("INSTrument:SELect 2")
File "C:python-2.7.9\lib\site-packages\pyvisa\resources\messagebased.py", line 384, in query
return self.read()
File "C:\python-2.7.9\lib\site-packages\pyvisa\resources\messagebased.py", line 309, in read
message = self.read_raw().decode(enco)
File "C:\python-2.7.9\lib\site-packages\pyvisa\resources\messagebased.py", line 283, in read_raw
chunk, status = self.visalib.read(self.session, size)
File "C:\python-2.7.9\lib\site-packages\pyvisa\ctwrapper\functions.py", line 1569, in read
ret = library.viRead(session, buffer, count, byref(return_count))
File "C:\python-2.7.9\lib\site-packages\pyvisa\ctwrapper\highlevel.py", line 180, in _return_handler
raise errors.VisaIOError(ret_value)
pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.
什么'打印rm.list_resources()'产生? – TigerhawkT3
如果你查询通道2,然后再通道1发生了什么? – TigerhawkT3
打印rm.list_resources()农产品(u'USB0 :: 0x05E6 :: 0x2230 :: 9102008 :: INSTR 'u'ASRL3 :: INSTR',u'ASRL10 :: INSTR“) – Sandy