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S1U2 user manual

Get started with the S1U2 unattended payment terminal.

Supplied components

  • S1U2 payment terminal
  • Cable that connects the terminal to the ethernet cable, audio output, and the region-specific power plug for charging
  • Cellular communication antenna
  • SIM card (pre-installed)
  • USB cable

The S1U2 is an all-in-one Android payment terminal suitable for unattended environments and outdoor use. It has a front camera and a barcode scanner and allows shoppers to pay by swiping, inserting, or tapping their card or mobile wallet.

Get started

Get your new unattended terminal up and running:

  1. Assign the terminal to your store.
  2. Inspect the terminal.
  3. Set up the S1U2 terminal:
    1. Mount the terminal in the front panel of the kiosk or self-service machine.
    2. Connect the cables.
    3. Board the terminal.
    4. Update the terminal software.
  4. Do any remaining steps related to mounting the terminal.

When you've completed these steps, you're ready to process payments!

Assign the terminal

During the installation, the S1U2 terminal obtains its configuration by boarding itself to your store. Contrary to most other terminals, you always need to assign an unattended terminal to a store before boarding the terminal.

Inspect the terminal

Because payment terminals process sensitive card data, you must verify that the terminal you received is the correct one, supplied by Adyen, and hasn't been tampered with.

  1. Verify that the box containing the terminal hasn't been opened and that the security seal is intact.
    The security seal is a red label with a bar code and a number, stuck across the lid of the box.

  2. If you have access to the Adyen Customer Area, log in and under Point of sale > Orders and returns find the order for your terminal. Then:

    • Verify that the serial number (S/N) on the box is the same as in the Customer Area.
    • Verify that the security seal number on the box is the same as in the Customer Area.
    • Using the track & trace link, track the order with the carrier to verify that they confirm having delivered the payment terminal.

  3. Break the security seal, take the terminal out of the box, and verify that the serial number (S/N) on the terminal is the same as the serial number on the box.

  4. Inspect the terminal for tampering. Check for missing seals or screws, additional wires or labels, holes in the device, and anything inserted in or attached to any part of the terminal.

If any of the above checks fails, contact our POS Support Team immediately.

Mount the terminal

You need to mount the S1U2 payment terminal on your vending, ticketing, multimedia kiosk, or other self-service solutions. To learn how to mount S1U2, see:

  • The installation instructions from the manufacturer of your self-service machine.
  • The installation instructions from Castles, the manufacturer of the S1U2 payment terminals.

Connect the cables

  1. Connect the MDB harness cable to the back of the terminal. This cable connects the terminal to the Ethernet cable, the power supply, and optionally to the audio output device.

    You can also connect the Ethernet cable directly into the terminal between the MDB slot and the SIM/SAM card slots.

  2. Connect the cellular communication antenna cable to the top antenna slot. To boost the signal, you can also connect two antennas.
  3. If your use case requires it, connect your self-service device to the S1U2 using the USB-A or USB-C slots on the back.

The S1U2 terminal now starts up.

Connect to your network

Connect your terminal to the internet so that it can communicate with the Adyen payments platform and your own back-end systems.

Connect to Wi-Fi

  1. After selecting your language on the Welcome screen, select the arrow button:
  2. On the Setup Wi-Fi screen, select the + sign.
  3. Turn on the WLAN toggle switch.
  4. Select a Wi-Fi network from the list, or select the + sign and add the name (SSID) of the Wi-Fi network.
  5. Enter the Wi-Fi password.
  6. Select OK.
    The terminal sets the network as default automatically, and connects to it.
    You'll now see a Wi-Fi icon at the top of the display.

Updating the connection settings

If you need to change Wi-Fi usage later:

  1. Select Settings > Network.
  2. Enter your passcode.
  3. Select Wi-Fi. You can now:
    • Turn Wi-Fi on or off using the WLAN toggle switch.
    • Add another network as described above.

Cellular 3G/4G failover

Your S1U2 terminal can automatically switch to processing payments using a cellular connection when the internet connection fails. For this you need to have a SIM card subscription with us for the terminal. When in doubt, contact our POS Support Team.

Board the terminal

Remember that the terminal can only board if it is assigned to your store.

  1. When the display shows Board the terminal, on the screen press OK.
  2. When the display shows the store that the terminal is assigned to, press OK to confirm.

Update the terminal software

  1. Under Settings, select Device info > Software version.
  2. Enter the Admin & Settings passcode and select Continue.
  3. Select Install now.

When the terminal finishes downloading and installing the software, it reboots. After that, you're ready to accept payments.

Payment terminal menus

Menu/Button Description Passcode

  • Device info: view information about the payment terminal, like the serial number, configuration version, and store details. Update the software version. Scan to connect to the terminal.
  • Network: enable and configure network connections. Enable airplane mode.
  • Configuration: view, update, or remove the configuration version.
  • Display: adjust the screen brightness.
  • Diagnostics: run network connection tests or send us a diagnostic report.
  • Apps: overview of the apps and certificates installed on the terminal. If an app is scheduled to be installed or removed, this action is carried out when you open this menu.
  • No passcode required:
    • Device info
    • Diagnostics
    • Display
  • Admin & Settings passcode:
    • Apps
    • Configuration
    • Network
    • Device info> Software version

  • History: view transactions stored on the terminal.
  • Totals: view a transaction totals report. Reset transaction totals.
  • New transaction: Refund, MOTO payment, MOTO refund, Manual key entry as a standalone terminal. Select the AID priority.
  • Transactions passcode required:
    • History
    • Totals
    • New transaction
  • Refunds passcode required:
    • New transaction > Refund

You can get the passcodes from your Customer Area or from your company's admin user.

Device info

To view information about the terminal:

  • Select Settings > Device info.

The screen shows:

  • Model, serial number, and IP address of the terminal.
  • Software version that the terminal currently uses.
  • The configuration version.
  • Merchant account that the terminal belongs to.
  • The store that the terminal is boarded to, and the store address.
  • A button to show a QR code with device info.
    When you contact our POS Support Team, they may ask you to scan this QR code.



If there is an issue with your payment terminal, first try to diagnose and solve the issue yourself, using our Troubleshooting documentation. In many cases, this is the quickest solution.

Ask for assistance

If you can't resolve the issue using the Troubleshooting documentation, send an email to our POS Support Team.

Provide the following information:

  • Merchant account.
  • PSP reference of the transaction, if applicable.
  • Terminal serial number. This number is available in the Device info and also printed on the back of the terminal (for example, S/N:123-456-789).