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Connect Scales to Square Point of Sale

Learn how to connect and troubleshoot supported scales with Square Point of Sale.

Supported Scales

Accessory Type Connection Manufacturer Model Square Stand iPad (no Square Stand) iPhone Android Square Register Square Terminal
Scale Bluetooth Star Micronics mG-S8200 NTEP Scale ✔️ Yes ✔️ Yes ✔️ Yes ✖️ No ✖️ No ✖️ No
Scale USB Brecknell 6700U ✔️ Yes ✖️ No ✖️ No ✔️ Yes ✔️ Yes ✔️ Yes
Scale USB CAS SW-RS ✔️ Yes ✖️ No ✖️ No ✔️ Yes ✔️ Yes ✔️ Yes
Scale USB CAS PD-2Z ✖️ No ✖️ No ✖️ No ✔️ Yes ✔️ Yes ✔️ Yes

For a list of all supported hardware by device, check out our Compatibility article.

Note: Brecknell 6700U and CAS SW-RS are supported with Square Stand with the following iPads at this time: 9.7" iPad (2017, 2018), iPad Pro 9.7", or iPad Air (1, 2). Not sure which iPad model you have? Identify your iPad here.

Connect Your Bluetooth Scale

The Star Micronics mG-S8200 NTEP Bluetooth Scale is supported through iOS devices.

To connect the Star Micronics mG-S8200 NTEP Scale to your device:

  1. Make sure your Bluetooth settings on your device are turned on.

  2. To check the connection, open the Square Point of Sale app and tap the three horizontal lines on the navigation bar. Then tap Settings > Scales.

  3. Next, tap Connect a Scale.

  4. You’ll see a list of supported scales. Tap Connect to pair a scale to your device.

If your scale ever becomes disconnected, your Point of Sale app will remember your scale and attempt to reconnect automatically.

Note: Your Square Point of Sale can pair with only one scale at a time. To pair your Bluetooth hardware with a different iPad, you’ll first need to unpair it.

Unpair Scale

To unpair your scale:

  1. Open the Square Point of Sale app and tap the three horizontal lines on the navigation bar. Then tap Settings > Scales.

  2. You’ll see your connected scale — tap Disconnect to unpair.

Troubleshoot Your Bluetooth Scale

  • Confirm you’re using a supported device with a supported scale. Square Register, Square Terminal, and Android devices aren’t supported at this time. For a list of all supported hardware by device, check out our Compatibility article.

  • Check that your scale is turned on,

  • Make sure the scale is paired to the correct device and not to another device.

  • Check that Bluetooth is turned on within your device’s settings. If enabled, turn it off and back on.

Connect Your USB Scale

The Brecknell 6700U USB Scale and CAS SW-RS are compatible with iPads with Square Stand, Android devices, Square Register, and Square Terminal, and require the following:

  • The latest version of the Square app for Android or iOS.

  • Items configured to sell by weight.

  • For Brecknell 6700U and CAS SW-RS scales, you’ll need a RS-232 to USB-A cable. This can be purchased through Square Shop.

  • For CAS PD-II scales, you will need a USB-B male to USB-A male cable, which is commonly found.

Connect to Android

To connect the Brecknell 6700U scale or CAS SW-RS scale to your Android device (including supported mobile devices, Square Terminal, and Square Register):

  1. Plug the 9-pin male end of the RS-232 cable into the port on your scale, and insert the USB-A male side into the hub for your Android device. Connect Brecknell USB Scale

  2. To check the connection, open the Square Point of Sale app and tap the three horizontal lines cpmon the navigation bar.

  3. Tap Settings > Scales.

  4. The connected scale should appear in the app menu as USB Scale. Keep in mind your Square Point of Sale app can only connect to one scale at a time.

To disconnect the scale, simply unplug the scale’s cable from your device.

To connect the CAS PD-2Z scale to your device:

  1. Plug the USB-B end of the USB-B to USB-A cable into the port on your scale and the USB-A side into the hub for your Android device.

  2. To check the connection, open the Square Point of Sale app and tap the three horizontal lines on the navigation bar.

  3. Tap Settings > Scales. The connected scale should appear in the app menu as USB scale.

Connect to iOS

To connect the Brecknell 6700U scale or CAS SW-RS scale to your iOS device:

  1. For iPads with Square Stand, you will need the serial-to-HID adapter sold separately on Square Shop.

  2. Plug in the 9 pin male end of the serial-to-HID adapter into the port on your scale. To keep the adapter firmly connected, twist the security screws into place.

  3. Plug the Micro-USB end of the cable into the adapter, and plug the USB-A side of the cable into your scale.


    Plug the Micro-USB end of the cable into the adapter, and plug the USB-A side of the cable into your scale.

  4. To check the connection, open the Square Point of Sale app and tap the three horizontal lines on the navigation bar.

  5. Tap Settings > Scales.

  6. The connected scale should appear in the app menu as USB Scale. Keep in mind your Square Point of Sale app can only connect to one scale at a time.

Note: Brecknell 6700U and CAS SW-RS are supported with Square Stand with the following iPads at this time: 9.7" iPad (2017, 2018), iPad Pro 9.7", or iPad Air (1, 2). The CAS PD-2Z Scale is not currently supported with iOS devices.

To disconnect the scale, simply unplug the scale’s cable from your device.

Troubleshoot Your USB Scale

  • Confirm you’re using the USB Scale with iPads with Square Stand or an Android smartphone or tablet running the latest version of the Square app.

  • Make sure your Square app is up to date. The latest version of the Square app for Android is required to connect to the scale. Learn how to update your app.

  • Ensure you’ve correctly set up Items to sell by weight.

  • Check that you have a secure connection between your scale, cables, and any additional connected accessories.

  • Confirm that you’re using the correct cable for your scale. The CAS PD-2Z scale connects via a USB-B port (unlike the Brecknell 6700U and CAS SW-RS scales that have a 9 pin port).

Note: Both the CAS SW-RS and CAS PD-2Z scales need to be in ECR-5 mode to work properly.

To make sure your CAS SW-RS scale is set up in the right ECR (Extended Control Register) mode:

  1. With the scale turned off hold the ZERO key and turn the scale on.

  2. When U SEt appears, release the ZERO key.

  3. Press the ZERO key and the display will show tyP X, where X is the current type setting. Use the TARE key to select type 5.

  4. Press the ZERO key and the display will show AP X (X being the time for thescale to auto power off.)

  5. Now select 60, 30 , 10, or oF can be selected with the TARE key.

  6. Once the selection is made, press the ZERO key. The scale will count up and go to the weigh mode.

For the CAS PD-2Z scale, use the following instructions:

  1. Make sure that power is OFF. While pressing # key, turn on the power. EcrSEt should be shown on the display. Then the current ECR type is shown on the display as tYPE-2.

  2. To make sure the scale is in ECR 5 mode, press the asterisk key ( * ) until the displayshows tYPE-5.

  3. Press the ZERO key to save your ECR mode changes.

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