Modbus Python施耐德PM5300

我正在尝试从PM5300仪表获取电压或电流，但始终只能使用32768。编码：

from pymodbus.constants import Endian
from pymodbus.payload import BinaryPayloadDecoder
from pymodbus.client.sync import ModbusSerialClient as ModbusClient
import logging

FORMAT = ('%(asctime)-15s %(threadName)-15s '
          '%(levelname)-8s %(module)-15s:%(lineno)-8s %(message)s')
logging.basicConfig(format=FORMAT)
log = logging.getLogger()
log.setLevel(logging.DEBUG)

UNIT = 0x01


def run_sync_client():
    client = ModbusClient(method='rtu', port='COM15', timeout=1, baudrate=19200, parity='E', stopbits=1, bytesize=8)
    client.connect()

    request = client.read_holding_registers(address=43010, count=2, unit=UNIT)
    result = request.registers
    print(result)
    decoder = BinaryPayloadDecoder.fromRegisters(result, Endian.Little, wordorder=Endian.Big)
    #dc2 = (decoder.decode_32bit_float() + 32768 /1000)
    #print(dc2)
    print(decoder.decode_32bit_float())


    client.close()


if __name__ == "__main__":
    run_sync_client()

寄存器列表中的地址3010与电流匹配（4是保持寄存器）。

使用Endian.Little进行日志和打印：

2020-06-16 20:11:24,349 MainThread      DEBUG    transaction    :115      Current transaction state - IDLE
2020-06-16 20:11:24,349 MainThread      DEBUG    transaction    :120      Running transaction 1
2020-06-16 20:11:24,350 MainThread      DEBUG    transaction    :219      SEND: 0x1 0x3 0xa8 0x2 0x0 0x2 0x45 0xab
2020-06-16 20:11:24,350 MainThread      DEBUG    sync           :75       New Transaction state 'SENDING'
2020-06-16 20:11:24,350 MainThread      DEBUG    transaction    :228      Changing transaction state from 'SENDING' to 'WAITING FOR REPLY'
2020-06-16 20:11:24,364 MainThread      DEBUG    transaction    :304      Changing transaction state from 'WAITING FOR REPLY' to 'PROCESSING REPLY'
2020-06-16 20:11:24,365 MainThread      DEBUG    transaction    :233      RECV: 0x1 0x3 0x4 0x80 0x0 0x80 0x0 0xb2 0x33
2020-06-16 20:11:24,365 MainThread      DEBUG    rtu_framer     :180      Getting Frame - 0x3 0x4 0x80 0x0 0x80 0x0
2020-06-16 20:11:24,365 MainThread      DEBUG    factory        :266      Factory Response[ReadHoldingRegistersResponse: 3]
2020-06-16 20:11:24,365 MainThread      DEBUG    rtu_framer     :115      Frame advanced, resetting header!!
2020-06-16 20:11:24,366 MainThread      DEBUG    transaction    :383      Adding transaction 1
2020-06-16 20:11:24,366 MainThread      DEBUG    transaction    :394      Getting transaction 1
2020-06-16 20:11:24,366 MainThread      DEBUG    transaction    :193      Changing transaction state from 'PROCESSING REPLY' to 'TRANSACTION_COMPLETE'
[32768, 32768]
**2020-06-16 20:11:24,366 MainThread      DEBUG    payload        :312      [32768, 32768]**
2020-06-16 20:11:24,367 MainThread      DEBUG    payload        :368      [b'\x00\x80', b'\x00\x80']
1.1755122874426309e-38

使用Endian.Big，结果为-4.591774807899561e-41

非常感谢！