Particle Counter - Cubic OPC-6510 - "write_bit" function with the value "1"

[BAParticleCounter]

The code line is: instance.write_bit(16, 1 5)

The Exception: System.ArgumentOutOfRangeException: The value must be greater than or equal to zero and less than the console's buffer size in that dimension. Parameter name: top Actual value was -1. at System.Console.SetCursorPosition(Int32 left, Int32 top) at Microsoft.PowerShell.PSConsoleReadLine.ReallyRender(RenderData renderData, String defaultColor) at Microsoft.PowerShell.PSConsoleReadLine.ForceRender() at Microsoft.PowerShell.PSConsoleReadLine.Insert(Char c) at Microsoft.PowerShell.PSConsoleReadLine.SelfInsert(Nullable1 key, Object arg) at Microsoft.PowerShell.PSConsoleReadLine.ProcessOneKey(ConsoleKeyInfo key, Dictionary2 dispatchTable, Boolean ignoreIfNoAction, Object arg) at Microsoft.PowerShell.PSConsoleReadLine.InputLoop() at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics)

If I use this function with the value of "0", it is working properly!

[j123b567]

Your example is incomplete and syntactically wrong, but the problem is probably in your own code that you didn't share.

• Microsoft.PowerShell is clearly not a python package
• exception is clearly not in minimalmodbus

[BAParticleCounter]

So this is my code. Everything is working. I can read registers. I can stop the working device. But I can't start it.

`import minimalmodbus from datetime import datetime from time import sleep

deviceAddress = 1 CONST_FLOWRATE = 28.3 inhalt = {}

particle_counter = minimalmodbus.Instrument('COM3', deviceAddress, minimalmodbus.MODE_RTU, debug=False)

particle_counter.serial.baudrate = 9600 # BaudRate particle_counter.serial.bytesize = 8 # Number of data bits to be requested particle_counter.serial.parity = minimalmodbus.serial.PARITY_NONE # Parity Setting here is NONE but can be ODD or EVEN particle_counter.serial.stopbits = 1 # Number of stop bits particle_counter.serial.timeout = 0.1 # Timeout time in seconds

particle_counter.clear_buffers_before_each_transaction = True particle_counter.close_port_after_each_call = True

particle_counter.write_bit(16, 1, 5)

hexParticleCount300nm = particle_counter.read_registers(3, 2, 4) hexParticleCount500nm = particle_counter.read_registers(5, 2, 4) hexParticleCount1000nm = particle_counter.read_registers(7, 2, 4) hexParticleCount2500nm = particle_counter.read_registers(9, 2, 4) hexParticleCount5000nm = particle_counter.read_registers(11, 2, 4) hexParticleCount10000nm = particle_counter.read_registers(13, 2, 4)

decParticleCount300nm = (hexParticleCount300nm[0] +hexParticleCount300nm[1]) /CONST_FLOWRATE decParticleCount500nm = (hexParticleCount500nm[0] +hexParticleCount500nm[1]) /CONST_FLOWRATE decParticleCount1000nm = (hexParticleCount1000nm[0] +hexParticleCount1000nm[1]) /CONST_FLOWRATE decParticleCount2500nm = (hexParticleCount2500nm[0] +hexParticleCount2500nm[1]) /CONST_FLOWRATE decParticleCount5000nm = (hexParticleCount5000nm[0] +hexParticleCount5000nm[1]) /CONST_FLOWRATE decParticleCount10000nm = (hexParticleCount10000nm[0] +hexParticleCount10000nm[1]) /CONST_FLOWRATE

inhalt = { 'Timestmp': datetime.now().strftime("%d/%m/%Y %H:%M:%S"), '300nm' : round(decParticleCount300nm), '500nm' : round(decParticleCount500nm), '1000nm' : round(decParticleCount1000nm), '2500nm' : round(decParticleCount2500nm), '5000nm' : round(decParticleCount5000nm), '10000nm': round(decParticleCount10000nm) } i=+1 particle_counter.write_bit(16, 0, 5)`

[j123b567]

This code looks ok (FYI you can use triple ``` to preserve formatting in a code block).

So other questions...

What is your python interpreter? Version and type - regular Python (CPython), IronPython, PyPy, ...

What is the minimalmodbus version or how do you obtain it? By pip install minimalmodbus, from git, ...

Can you attach the complete output of the script you have provided as an example? Probably just some exception, it does not print anything...

[BAParticleCounter]

• Regular Python V3.7.8

• Over "py -m pip install minimalmodbus" - It is the Version 2.0.1

The script is working. So it don't interrupt. But sometimes (not all the time) i get this output besides the path where i start the script from:

"Oops, something went wrong. Please report this bug with the details below. Report on GitHub: https://github.com/lzybkr/PSReadLine/issues/new

Last 200 Keys: o d b u s M a s t e r P y t h o n / m o d b u s t e s t c o d e . p y Enter & Space " C : / P r o g r a m Space F i l e s Space ( x 8 6 ) / M i c r o s o f t Space V i s u a l Space S t u d i o / S h a r e d / P y t h o n 3 7 6 4 / p y t h o n . e x e " Space c : / U s e r s / u s e r 0 1/ D o c u m e n t s / 0 0 T e s t o r d n e r M o d b u s / 0 6 _ S o f t w a r e / M o d b u s M a s t e r P y t h o n / t e s . p y Enter

Exception: System.ArgumentOutOfRangeException: The value must be greater than or equal to zero and less than the console's buffer size in that dimension. Parameter name: top Actual value was -2. at System.Console.SetCursorPosition(Int32 left, Int32 top) at Microsoft.PowerShell.PSConsoleReadLine.ReallyRender(RenderData renderData, String defaultColor) at Microsoft.PowerShell.PSConsoleReadLine.ForceRender() at Microsoft.PowerShell.PSConsoleReadLine.Insert(Char c) at Microsoft.PowerShell.PSConsoleReadLine.SelfInsert(Nullable1 key, Object arg) at Microsoft.PowerShell.PSConsoleReadLine.ProcessOneKey(ConsoleKeyInfo key, Dictionary2 dispatchTable, Boolean ignoreIfNoAction, Object arg) at Microsoft.PowerShell.PSConsoleReadLine.InputLoop() at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics)

PS. Whats weird too. I can also stop the device from working with the write_bit function with the value "1".

PPS. The Hexcode for the device to start working is: 01 05 00 10 00 01 And for stop working: 01 05 00 10 00 00

[j123b567]

Ok, the part of the problem with the weird exception is offtopic. You should probably follow this https://github.com/PowerShell/PSReadLine/issues/1306

Back to the problem, can you please add the output of the script with debug=True?

[BAParticleCounter]

Oh wow why didn't i think of setting debug = true...Beginner's mistake haha

I have only taken the important output:

MinimalModbus debug mode. Will write to instrument (expecting 8 bytes back): 01 05 00 10 FF 00 8D FF (8 bytes) MinimalModbus debug mode. Clearing serial buffers for port COM3 MinimalModbus debug mode. No sleep required before write. Time since previous read: 91786703.00 ms, minimum silent period: 4.01 ms. MinimalModbus debug mode. Closing port COM3 MinimalModbus debug mode. Response from instrument: 01 05 00 10 FF 00 8D FF (8 bytes), roundtrip time: 0.0 ms. Timeout for reading: 100.0 ms.

So the way I see it. The FF 00 should be 00 01.

[BAParticleCounter]

Problem solved!

In the "minimalmodbus.py" file, beginning at line 2766:

if value == 0:
        return "\x00\x00"
    return "\xff\x00"

For my application I need the hexcode 00 01 and not ff 00.

return "\x00\x01"

So I changed it and now it is working.

Thank you for your help @j123b567 !