Python read SDM230 Modbus Single Phase Energy Meter with Pymodbus

 

 

import struct
import binascii
import time

from pymodbus.constants import Endian
from pymodbus.payload import BinaryPayloadDecoder
from pymodbus.payload import BinaryPayloadBuilder


from struct import *
from pymodbus.client.sync import ModbusTcpClient

import logging
logging.basicConfig()
log = logging.getLogger()
#log.setLevel(logging.DEBUG)

host = '192.168.1.204'
port = 502

client = ModbusTcpClient(host, port)
client.connect()


for x in range(0, 300):

rr = client.read_input_registers(0x0000,2,unit=1)

assert(rr.function_code < 0x80) # test that we are not an error

print "-----------------------------"
 print rr
 print rr.registers
 print "-----------------------------"
 print format(rr.registers[0], '02x')
 print format(rr.registers[1], '02x')
 print "-----------------------------"
 # PYTHON FLOAT IEEE 754
 decoder = BinaryPayloadDecoder.fromRegisters(rr.registers, endian=Endian.Big)
 print ("Voltage is ", decoder.decode_32bit_float(), "V")
 print "-----------------------------"
 time.sleep(1)

 

 

 

 

 

 

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