#!/usr/bin/env python3
""" How-to add float support to ModbusClient. """
from pyModbusTCP.client import ModbusClient
from pyModbusTCP.utils import encode_ieee, decode_ieee, \
long_list_to_word, word_list_to_long
class FloatModbusClient(ModbusClient):
"""A ModbusClient class with float support."""
def read_float(self, address, number=1):
"""Read float(s) with read holding registers."""
reg_l = self.read_holding_registers(address, number * 2)
if reg_l:
return [decode_ieee(f) for f in word_list_to_long(reg_l)]
else:
return None
def write_float(self, address, floats_list):
"""Write float(s) with write multiple registers."""
b32_l = [encode_ieee(f) for f in floats_list]
b16_l = long_list_to_word(b32_l)
return self.write_multiple_registers(address, b16_l)
if __name__ == '__main__':
# init modbus client
c = FloatModbusClient(host='localhost', port=502, auto_open=True)
# write 10.0 at @0
c.write_float(0, [10.0])
# read @0 to 9
float_l = c.read_float(0, 10)
print(float_l)
c.close()