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我正在使用python庫最小Modbus讀取電能表(RS-485)。Modbus,python和最小modbus
我試圖使用該函數在一次
read_registers(registeraddress,numberOfRegisters,functioncode = 3)
這裏是Python庫的代碼來讀取多個寄存器:
def read_registers(self, registeraddress, numberOfRegisters, functioncode=3):
"""Read integers from 16-bit registers in the slave.
The slave registers can hold integer values in the range 0 to 65535 ("Unsigned INT16").
Args:
* registeraddress (int): The slave register start address (use decimal numbers, not hex).
* numberOfRegisters (int): The number of registers to read.
* functioncode (int): Modbus function code. Can be 3 or 4.
Any scaling of the register data, or converting it to negative number (two's complement)
must be done manually.
Returns:
The register data (a list of int).
Raises:
ValueError, TypeError, IOError
"""
_checkFunctioncode(functioncode, [3, 4])
_checkInt(numberOfRegisters, minvalue=1, description='number of registers')
return self._genericCommand(functioncode, registeraddress, \
numberOfRegisters=numberOfRegisters, payloadformat='registers')
我得到的問題是,寄存器將數據保存爲Long
,但此函數返回它們作爲名單int
,看看它看起來不正確的值。
這是我的腳本在此刻:
##!/usr/bin/env python
import minimalmodbus
import time
import glob
import sys
import MySQLdb
instrument = minimalmodbus.Instrument('/dev/ttyUSB1', 7)
#Debug Options
#instrument.debug = True #debug modbus
read = False
def convert(value):
data=chr(value)
return data
def read_registers_ime():
data = instrument.read_registers(4096,20)
return data
while True:
try:
while read == False:
data = read_registers_ime()
print data
time.sleep(0.11)
read = True
break
except KeyboardInterrupt:
print "Stopped"
sys.exit()
except TypeError:
print "TypeError"
except IOError:
print "IOError"
目前,它返回下列信息:
[3,39192,3,44592,3,44592,0,423, 0,0,0,0,0,6,19884,6,24584,6,19884]
到目前爲止,我試圖將數據轉換回原始格式失敗。我非常感謝這裏的幫助。
非常感謝,
布萊恩