为串行p在pyvisa中指定写_ascii_值的值

Question

我想通过RS232toUSB将Keithley 6485皮安表连接到我的Linux PC（CentOS 6.9）上，并用pyvisa用python编写代码（2.7.13版）：

#! /usr/local/bin/python2.7 import sys import visa from visa import constants rm = visa.ResourceManager('/usr/local/vxipnp/linux/lib64/libvisa.so') #open serial connection and set baud to 9600, 8 data bits, CR termination, one stop bit, none parity, no flow control amm = rm.open_resource('ASRL2::INSTR', baud_rate = 9600, data_bits = 8, write_termination= '\r', read_termination = '\r') constants.VI_ASRL_STOP_ONE constants.VI_ASRL_PAR_NONE constants.VI_ASRL_FLOW_NONE amm.write("*RST") # Return 6485 to RST default amm.write("SYS:ERR:ALL?") # Return error message amm.write("TRIG:DEL 0") # Set trigger delay to zero seconds amm.write("TRIG:COUNT 2500") # Set trigger count to 2500 amm.write("SENS:CURR:RANG:AUTO OFF") # Turn auto range off amm.write("SENS:CURR:NPLC .01") # Set integration rate to NPLC 0.01 amm.write("SENS:CURR:RANG 2e-7") # Use 200 nA range amm.write("SYST:ZCH OFF") # Turn zero check off amm.write("SYST:AZER:STAT OFF") # Turn auto zero off amm.write("DISP:ENAB OFF") # Turn Display off amm.write("*CLS") # Clear status model amm.write("TRAC:POIN 2500") # Set buffer size to 2500 amm.write("TRAC:CLE") # Clear buffer amm.write("TRAC:FEED:CONT NEXT") # Set storage control to start on next reading amm.write("STAT:MEAS:ENAB 512") # Enable buffer full measurement event amm.write("*SRE 1") # Enable SRQ on buffer full measurement event amm.write("*OPC?") # operation complete query (synchronize completion of commands) amm.write("INIT") # start taking and storing readings wait for GPIB SRQ line to go true amm.write("DISP:ENAB ON") # Turn display on print(amm.query_ascii_values("TRAC:DATA?")) # Request data from buffer

Answer 1

SCPI有几个协议规则。希望我能引导你通过“查询”规则。在

如果向仪器询问查询，则必须读取缓冲区中的结果：

amm.write("*RST")                       # Return 6485 to RST default 
amm.write("SYS:ERR:ALL?")               # Return error message  
amm.write("TRIG:DEL 0")                 # Set trigger delay to zero seconds

一旦你发送了“系统：错误：全部？”仪器希望你能读出结果。将其从write命令转换为查询，否则以下命令将出错并无法按预期执行：

^{pr2}$

操作完成命令也是如此：

print(amm.query_ascii_values("*OPC?"))          # operation complete query (synchronize completion of commands)

*OPC？将在上一个命令完成后返回“1”。在