Reading REAL and decoding with decode_32bit_float()

[BigTuna]

Maybe someone can help me figure out what I'm missing here. I'm following the example exactly:

#!/usr/bin/env python
'''
Pymodbus Payload Building/Decoding Example
--------------------------------------------------------------------------
'''
from pymodbus.constants import Endian
from pymodbus.payload import BinaryPayloadDecoder
from pymodbus.payload import BinaryPayloadBuilder
from pymodbus.client.sync import ModbusTcpClient as ModbusClient


client = ModbusClient('192.168.0.10)
client.connect()

rr = client.read_holding_registers(2654, 2)
decoder = BinaryPayloadDecoder.fromRegisters(rr.registers, endian=Endian.Little)
print decoder.decode_32bit_float()

client.close()

What I'm suppose to get is 33.87. What it prints is 1.46638408846e-34

Using MacModbus App (http://www.modbusapps.com/) I can see the binary in the memory locations:

42654    01110111111101010
42655    0100001000000111

Putting the 2 registers together (01000010000001110111011111101010) and checking here:

http://www.h-schmidt.net/FloatConverter/IEEE754.html

I get my 33.87.

Since I've confirmed everything is there in memory does anyone see what I'm doing wrong with my pymodbus code?

Thanks!

[BigTuna]

Made some progress. Confirmed I need to use Big Endian. The problem is that m340 stores the first half in the second register and the function expects in to be first half first.

 

[Bashwork]

Sorry I am so late to respond, but I am glad you made progress!

Galen