Tenma 72-7732A Comport / HID

https://github.com/swharden/pyTENMA

Maybe this helps.!

Like I said in the post, "not as a comport" - the pyTenma software looks for a comport 

Thank you though

Hey Zacory

Zacory said:

Like I said in the post, "not as a comport" - the pyTenma software looks for a comport 

I'm sure aswinvenu was replying with this because:

Zacory said:

I am wondering if anyone has successfully read this device with Python, as a comport

So maybe there's some hint in that code and you can change the way Python interrogates the device. 

From my limited expertise I wouldn't expect a HID component to communicate in this way, and I would expect this to be a problem with the driver installed, assuming you're using windows, and it needing a replacement driver?

You can find the windows software/driver here:

 Tenma 72-7732 Windows 7 Software 

  Tenma 72-7732A software win10.zip  

I'd confirm that by looking at how the device identifies under Linux, maybe with a liveUSB (I appreciate you don't explicitly state what operating system you're using).

HID devices communicate exchanging "reports" which are just blocks of bytes. The Operating system can query their "Report Descriptor" which should tell the kind of device it is, the "endpoints" and the sizes of the reports for input and output. They are not as simple as just sending bytes down the line, unfortunately.

Now, if you are willing to do the reverse engineering of the protocol yourself, there's a library for Python called pyhidapi that would allow you to connect to the device and read and write these reports. Now, you will probably also need a tool that allows you to dump the report descriptor from the device, to see the structure of the reports (which will depend on what operating system you are running), or better yet, you can set up a USB monitoring tool to capture the reports sent back and forth between the device and the official software to get an idea of what is being sent or received.

This could also be the case. Sometimes devices will not show up in windows as comm ports until you install their driver.