from pymodbus.client import ModbusTcpClient
import struct

MODBUS_IP="10.0.0.40"
client=ModbusTcpClient(MODBUS_IP, port=502)
client.connect()

try:
    rr = client.read_input_registers(30, count=3, slave=1)
    print("Raw 30..32:", rr.registers)

    def as_int16(x):
        return struct.unpack(">h", struct.pack(">H", x))[0]

    for i, raw in enumerate(rr.registers, start=30):
        print(i, "raw", raw, "int16", as_int16(raw), "scaled", as_int16(raw)/10.0)
finally:
    client.close()