stephane / pylibmodbus Goto Github PK

Tried this on a raspberry PI using the RS485 Shield V3 - Raspberry Pi
Already configured the UART pins to disable serial login prompt and to enable the serial hardware.
My code is below:

from pylibmodbus import ModbusRtu

modbus = ModbusRtu(baud=9600)
response = modbus.read_registers(0,1)

print(response)

This is the error I get:

Traceback (most recent call last):
  File "libmodbus.py", line 1, in <module>
    from pylibmodbus import ModbusRtu
ImportError: cannot import name 'ModbusRtu'

I'm sorry for my English.
When I use pylibmodbus in rtc mode,crc16 checksum was failed,fetch errno still is 0.
I know this is cffi bug.

Hi Stephane,

It looks like the test directory was dropped from the git repository and this causes the tests to
fail.

Hi Stephane,

i wrote some simple code to read the power value from a energy measurement device via modbus tcp.
The code worked fine until I used it again today. The device is available and can be polled with other modbus clients. Somehow the connection is refused with Errno 115.
Have there been any changes on the library or do you have an idea what might be the problem?

Thanks for your help!
Jan

from pylibmodbus import modbus_tcp
client = modbus_tcp.ModbusTcp('10.15.2.1', 502)
client.connect()
client.set_slave(2)
ans = client.read_input_registers(19026, 2)
num = struct.unpack('>f', struct.pack('>HH', ans[0], ans[1]))[0]
client.close()