Primo with Delta DTB controller (with USB port)

This manual explains how to connect a Primo roaster equipped with a Delta DTB controller and USB port to the Cropster Roasting Intelligence



  • USB cable
  • Driver for the USB serial converter

Note: The driver may be already be pre-installed with your operating system.

The driver used is the DTech DT-5119 driver. If it is not already pre-installed, you can download it here.

Supported measurements

  • Bean temperature
  • Gas (%)
  • Gas control
  • Set temperature (°)

  • *Exhaust temperature

*Optional upgrade done by Primo that allows the reading of Exhaust temperature via Phidget TMP1101 + VINT Hub.

Roasting Intelligence (RI) Setup

Installing the Roasting Intelligence (RI) software

  1. Download the custom version of Roasting Intelligence here.
  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 user name 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. If you are setting up RI for the first time, click the Select machine button in the banner at the top or click  Preferences > Machine > Configuration bottom left to access the machine preferences screen. 
  2. Select the Roasting machine you would like to connect from the drop down menu. If the machine is not in the list you can add via the online platform.
  3. After selecting the machine all supported measurements will load. Change the order of the measurements by using the drag and drop icon  and moving it into position.
  4. Switch on the measurements you would like to enable and select Primo PID from the drop down. Repeat this step for all measurements you would like to enable.
    *If your roast machine is equipped with the optional Phidget for measuring Exhaust temperature, please select Phidgets Thermocouple Sensor (TMP1101) from the drop down and select 0 as the Channel and J as the type, as seen in the screenshot below:
    Screenshot 2024-06-20 at 16.13.01-1
  5. Click on the Gear icon to open the PID-settings. 
  6. Select the serial port corresponding to your roast machine, as well as, the temperature unit shown on your roast machine's display:
    Screenshot 2024-06-20 at 16.20.02
  7. Click OK and then click Save to confirm the changes. 
  8. RI will automatically restart after saving the changes. 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.
    Screenshot 2024-06-13 at 11.29.39

The Primo roaster can be controlled with Cropster’s control sliders in two ways:
  • Control the set temperature using the Set temperature control slider. Enable the “Auto” toggle on the control slider to use set temperature control.
  • Manually control the amount of gas in a 0-100% range using the Gas control slider. Disable the “Auto“ toggle on the control slider to use manual gas control.

Screenshot 2024-06-20 at 16.30.15

    If you have selected a serial port from the RI, and you receive Sources connected from the bottom-right corner of the roasting application, but you can't see live temperature readouts, you may not have selected the serial port referring to the roast machine's connection.

    Learn how to customize your RI user preferences


    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?

    • Are the settings copied correctly?
    • If you are not able to control Gas, you may need to set the roaster's PID to Manual mode. In order to do so, hold the set button on the PID for several seconds until you see flashing values, then use the arrow to navigate to Ctrl. Here, you should see PID as the correct option and click set again to confirm.

    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 the Roasting Intelligence (RI5) - Getting Started manual and enjoy tracking your first roasts! More manuals and videos can be found on