San Franciscan with Watlow EZ-ZONE Controller (via USB) - Roasting Intelligence (RI) Setup

This manual explains how to connect a San Franciscan roast machine with (Watlow controls) via USB, to Cropster's Roasting Intelligence.



Note: On recent MacOS devices, the driver may be already pre-installed with your operating system.

Supported measurements

The Gas control feature is currently available in beta for San Franciscan roast machines built after August 2019 with a Cropster switch.

If you haven't been invited to participate in the beta program for this integration, but you are interested in participating and testing the feature, please sign up here.

Roasting Intelligence (RI) Setup

Installing the Roasting Intelligence (RI) software
  1. Download the Roasting Intelligence from:
  2. The Cropster installer leads you through all the installation steps.
  3. Open the RI by double-clicking the Cropster icon on the desktop
  4. Enter your username and password.
    The username is the email address your Cropster invitation has been sent to, and use the password you've generated when accepting the invitation.
  5. Check the Remember credentials box if you want to be able to run the RI offline.
  6. Click the Login button.

Establishing a connection to the machine

  1. Go to Account > Preferences > Machine tab.
  2. Select the Roast machine you would like to connect from the drop-down menu.
  3. Select San Franciscan PID (Watlow EZ-ZONE) from the drop-down for all measurements.
  4. Click on the gear () icon to open the PID-settings. 
  5. Copy the settings as shown in the screenshot below:
    • Serial port:
      Windows: choose the COMx option that refers to the connection to the roaster.
      Mac: choose the USBx option that refers to the connection to the roaster.

  6. Click Save to confirm the changes. The RI requires a restart to apply the settings.

    If the setup was successful, you will be able to see temperature values on the right-hand side of the RI screen, after the restart.

    Learn more about how to:

    When using Replay assist, do not use any other temperature controlling software in parallel. Any gas changes from a concurrent client, may disable Replay assist for the remainder of the roast. 


    If the RI indicates No source connected and/or you cannot see any measurements, please check the following: 

    • Is the roast machine connected to the computer? 
    • Have you downloaded the driver for the USB serial converter?
    • Is the correct serial port within the RI selected?
    • On MacOS: try installing the beta VCP driver. MacOS X10.15 to MacOS 11 (this is a Beta driver release and the installer should be run from the /Applications folder on your machine)

    For further assistance, please create a support ticket by clicking the Support button in the left lower corner of the app. A Cropster support rep will get in touch with you.

    Congratulations! You have successfully set up the Cropster Roasting Intelligence!

    Check out our Getting started video and enjoy tracking your first roasts! 

    More manuals and videos can be found on