Support & Documentation

What you need

• Windows 10 or later
• Python 3.12 or later — installed in step 1 below
• A USB-to-RS485 adapter (FTDI or CH340)
• A ZT-100-C connected on the adapter’s A/B terminals

Install Python

Get it from python.org/downloads and run the installer. On the first screen, tick “Add python.exe to PATH” before clicking Install — it is off by default, it is easy to miss, and without it none of the commands below will be found. If you have already installed Python without it, re-run the installer, choose Modify, and tick it there.

Unpack the download

Right-click zt100c-app.zip and choose “Extract All”. Pick a folder you can find again — Documents is fine. Windows cannot run it from inside the zip.

Open a terminal in that folder

Open the unpacked folder, hold Shift, right-click the empty space, and choose “Open PowerShell window here” or “Open in Terminal”. You want the folder containing pyproject.toml.

Install the tool

Run pip install -e . — this pulls in the interface libraries and creates the launcher. A few hundred megabytes, a couple of minutes.

Run it

Run zt100c-app. From then on you can start it the same way, or search for “ZT-100-C” in the Start menu.

Connecting to a card

1. Plug the USB-to-RS485 adapter into the PC
2. Wire A/B through to the ZT-100-C
3. Open the Connect page and pick the COM port
4. Click Connect — the product name and firmware version appear once it answers

Logging

Measurement logs are written under %USERPROFILE%\\ztlogs\\zt-100-c. The active log path is shown in the app while logging runs.

Troubleshooting

• “python is not recognized” — the “Add python.exe to PATH” box was not ticked. Re-run the Python installer, choose Modify, and tick it.
• The card does not appear in the port list — it shows up as a COM port, and a USB-to-RS485 adapter usually needs its own driver first. Check Device Manager under Ports (COM & LPT).
• The port is listed but greyed out — another application already has it open.