trying to readout EMH - LZQJ-XC but cant build up connection about iec62056-21

[Krolken]

Does the port connect or not. Do you not get data back?

[GreenSkiLLz]

Does the port connect or not. Do you not get data back?

No i don't get any data back, Im using this script to check what usb ports are available and choose the one belonging to my EMH.

import serial.tools.list_ports
ports = serial.tools.list_ports.comports()

for port, desc, hwid in sorted(ports):
        print("{}: {} [{}]".format(port, desc, hwid))

when i run the code in my initial comment it does not Connect and just returns a Timeout error after some Seconds.

When using the EMH Software that came with the Lzqj-xc " Emh-Combi-master" it works just fine. The Emh is not the Problem. Do i have to change Something when declarating the client?

[Krolken]

It shouldn't need to. It starts at 300 baud and then the init process is done.

Just to be clear: you are using an optical probe?

I know the modems in EMH meters are annoying so when you send over TCP you need to emulate 7E0 over tcp. But via the optical port is was never a problem.

CombiMaster has a communications log window that you can open and see what is sent to the meter. Do you mind pasting that to see if there is a need to add something.

I also know over RS485 on you need to add the address in the init message.

Also set up a standard logger with log level DEBUG so you can see where the program is halting. If you get timeout error it should be because it did not reveive a response and EMH never answers if they get the wrong data in, could be because of wrong speed if it has been set to be constant. But maybe it doesnt fail in the first message exchange but in any of the following.

[GreenSkiLLz]

Yes i am using the USB connection of the optical probe. Not sure where to look for the communication log window but im gonna try and find it :D
Going to debug the messages today, if i get any info of value i'll message again.
Thanks 👍

[Krolken]

Also see if you can get the python program log output

[GreenSkiLLz]

So my Debug says this:

10:20:42,885 INFO: Staring init sequence
10:20:42,886 INFO: Sending request message: RequestMessage(device_address='')
10:20:42,937 DEBUG: Sent b'/?!\r\n' over transport: SerialTransport
10:20:42,938 DEBUG: Resting for 0.25 seconds
Traceback (most recent call last):
File "c:\Users\md\Desktop\TESTINGSTUFF\Serial.py", line 103, in
iec()
File "c:\Users\md\Desktop\TESTINGSTUFF\Serial.py", line 27, in iec
data_answer = client.standard_readout()
^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\iec62056_21\client.py", line 186, in standard_readout self.startup()
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\iec62056_21\client.py", line 150, in startup
ident_msg = self.read_identification()
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\iec62056_21\client.py", line 264, in read_identification
data = self.transport.simple_read(start_char="/", end_char="\x0a")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\iec62056_21\transports.py", line 147, in simple_read
raise TimeoutError(f"Read in {self.class.name} timed out")
TimeoutError: Read in SerialTransport timed out

My Code is the same as before except with the debuglogger:

def iec():
    from iec62056_21.client import Iec6205621Client
    import logging

    logging.basicConfig(
        level=logging.DEBUG,
        format="%(asctime)s,%(msecs)d %(levelname)s: %(message)s",
        datefmt="%H:%M:%S",
    )

    client = Iec6205621Client.with_serial_transport(port="COM5")
    client.connect()
    data_answer = client.standard_readout()
    print(data_answer)


iec()

Treid with the EMH Programm after the Timeout and it worked liked usual so the EMH is working correctly but not with the python script. :(

It seems to stop while recieving the identification.

[GreenSkiLLz]

ok i think i got it, you were right, the speed is set to be constant, changing the baudrate in transports.py to 9600 semed to solve the problem, now its a matte rof permissions.

inside of transports.py i changed:

    def connect(self):
        """
        Creates a serial port.
        """
        self.port = serial.Serial(
            self.port_name,
            baudrate=9600, #<-- changed 300 to 9600
            parity=serial.PARITY_EVEN,
            stopbits=serial.STOPBITS_ONE,
            bytesize=serial.SEVENBITS,
            writeTimeout=0,
            timeout=self.timeout / 2,
            rtscts=False,
            dsrdtr=False,
            xonxoff=False,
        )

[Krolken]

OK. Good.
Standard readout usually doesn't have permissions?
Are you trying to access programming mode? Standard password is 00000000

[GreenSkiLLz]

no i am just trying to readout P.02 but atm im just trying to use the standart readout to see if its working.

Now i get this permission Error:

11:02:11,528 INFO: Staring init sequence
11:02:11,528 INFO: Sending request message: RequestMessage(device_address='')
11:02:11,587 DEBUG: Sent b'/?!\r\n' over transport: SerialTransport
11:02:11,588 DEBUG: Resting for 0.25 seconds
11:02:12,282 DEBUG: Received b'/EMH5\@01LZQJL0013E\r\n' over transport: SerialTransport
11:02:12,282 INFO: Received identification message: IdentificationMessage(identification='@01LZQJL0013E', manufacturer='EMH', switchover_baudrate_char='5')
11:02:12,282 INFO: Sending AckOptionsSelect message: AckOptionSelectMessage(baud_char='5', mode_char='0')
11:02:12,338 DEBUG: Sent b'\x06050\r\n' over transport: SerialTransport
11:02:12,338 DEBUG: Resting for 0.25 seconds
Traceback (most recent call last):
File "c:\Users\md\Desktop\TESTINGSTUFF\Serial.py", line 103, in
iec()
File "c:\Users\md\Desktop\TESTINGSTUFF\Serial.py", line 27, in iec
data_answer = client.standard_readout()
^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\iec62056_21\client.py", line 194, in standard_readout self.transport.switch_baudrate(self.switchover_baudrate)
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\iec62056_21\transports.py", line 274, in switch_baudrate
self.port = self.port = serial.Serial(
^^^^^^^^^^^^^^
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\serial\serialwin32.py", line 33, in init
super(Serial, self).init(*args, **kwargs)
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\serial\serialutil.py", line 244, in init
self.open()
File "C:\Users\md\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\serial\serialwin32.py", line 64, in open
raise SerialException("could not open port {!r}: {!r}".format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port 'COM5': PermissionError(13, 'Zugriff verweigert', None, 5)

I guess its because it tries to open the port twice maby?

EDIT: It Works now, i changed nothing but it works now, whatever... Now imma go figgure out how to read the P.02 Profile... Case Closed, Thanks for Help