sanny32/openmodscan

Open ModScan is a Free Modbus Master (Client) Utility

openmodscan's Issues

Is possible to read and write 64bit register

Hi!

thanks for this tool!

Is possibile to read/write 64bit register.
I need to access to eneergy meter data stored in INT64 type

Do you think is possible?

There is no 32 bit Signed/Unsigned register with swap option (like there is for Float register)

Hello,

There are many RTUs supporting 32bit registers (signed/unsigned32). It would be nice if the tool can support this as well so it will have all most widely used options:

• Bits
• Bytes (optional)
• 16bit Signed/unsigned register (input/holding) + bytes swap
• 32bit Signed/unsigned register (input/holding) + words/bytes swap
• 32bit Float register (input/holding) + words/bytes swap
• 64bit Float register (input/holding) - less common

Thank you,
Omer.

Add Modbus Address Scan Export to CSV

Need to add Modbus Address Scan Export to CSV file

Not runs

I installed in Debian, but I do not know how it runs.

Offset +1 on all registers

If I read holding register Address 0001 it actually tries to read register 0, so exception is throwed. To read register 1 you have to set Address to 0002. It applies to all kind of registers.

TCP scanner doesn't work, missing 32bit signed+unsinged option and more

Hello,

I just found OpenModScan yesterday and it looks very nice :) Thank you.

I used to work with the original ModScan utility years ago but since then I found newer, better and free tools with the same functionality.

The nice thing with OpenModScan is that it has two tools in one: client and scanner functionality - both Serial and TCP.

There are few issues I found:

1. TCP scanner:
   I didn't yet tried the Serial scanner but with the TCP scanner I did two tests: yesterday at home and today at work. For the test at home I used a Modbus slave emulator (pyModSlave). While testing, OpenModScan didn't show any IDs even though the OpenModScan client itself was able to connect and show data for the specific ID that was configured.

The test I did today was at a real project where I use many Modbus gateways, When I tried testing one of the gateway's IP, the scanner show no results (the range of IPs was for only one IP). I tried a wider range of IPs e.g 10.0.20.10-10.0.20.15 and still nothing. Only after I changed the range to something wider, the scanner did show some results but with non existing IDs.

For example: the Modbus gateway hosts IDs 10-11 but the scanner returned many other IDs even above 100.

There is another free scanner for Modbus (Modbus RTU Scan). It works very well but it only supports the serial protocol. Both GUIs look very similar....

2. There is no 32 bit Signed/Unsigned register with swap option (like there is for Float register)

3. Changing Device ID in client WHILE connected:
   if you put the correct Device ID before connecting to the TCP device, communication work fine. If you change ID while connected to the device, you get the "no responses from...". This is Ok. But if I change the ID back to the correct ID, communication is not restored. I must disconnect and reconnect.

4. Show traffic:
   it will be nice to change the original ModScan traffic view so it will show Rx/Tx line by line: Tx, Rx, Tx, Rx). It will be easier to understand debug. I also saw in the past functionality such as phrasing each Rx/Tx packet so the software can tell you exactly how the packet is built: Rx or Tx, ID, type of register (coild, input, holding etc..), range of registers and the data/values (like in QModMaster).

Thank you,
Omer.

How to install?

Hi all,

I would like to install the software on a Linut Mint (22?) with Cinnamon desktop.

I installed the package(s) (amd64 version) and I'd expect that the installation gives a hint if Qt5 or Qt6 is present or needed (I have no idea what that is, I'm more like an engineer).

Both packets get installed with the info "already installed". Then I go to /opt/OpenModScan and run omodscan.sh only to see this:

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/opt/OpenModScan/plugins//platforms:" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: minimalegl, wayland, offscreen, eglfs, vkkhrdisplay, linuxfb, wayland-egl, minimal, vnc, xcb.

Sorry I have no idea what to do next and for I might not be the only one I mustered up the courage to post here :-) in hope for a hint.