> For the complete documentation index, see [llms.txt](https://help.verkada.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.verkada.com/new-alarms/installation/set-up-bsp-adapters.md).
# Set Up BSP Adapters
BSP adapters add addressable wired sensor coverage to a compatible Verkada alarm panel using a single cable run. There are two adapters:
* **QX61 BSP RS-485 Adapter -** Converts an RS-485 port on the alarm panel into a BSP cable run. Each QX61 supports one BSP run and one RS-485 passthrough, so the port can still be used for another RS-485 device.
* **QX51 BSP Sensor Adapter -** An addressable sensor module that expands the panel's input capacity. Each QX51 supports up to two sensors, and multiple units daisy-chain off a QX61 or a BP42's onboard BSP port.
{% hint style="info" %}
When taking over a non-Verkada addressable or polling loop system, disconnect all non-Verkada polling loop modules before connecting the loop to the Verkada alarm panel. Non-Verkada modules are not rated for the higher voltage supplied by the BP52 and may damage the cable.
{% endhint %}
***
## Supported configurations and limits
Before installation, run the [BSP calculator](https://www.verkada.com/alarms/addressable-sensor-system/calculator/) for each QX51 chain you plan to deploy. Use the results to determine how many adapters you need, and verify that your design stays within the voltage, current, and cable-length limits for your wire gauge.
QX51 modules per BSP run
Up to 100
Sensors per QX51
Up to 2
Powered sensors per QX51
1
Powered sensors per BSP run
Up to 50
BSP runs per QX61
1
RS-485 passthrough per QX61
1
Each QX51 supports the following sensor combinations:
* One unpowered sensor, such as a door contact.
* Two unpowered sensors.
* One unpowered sensor and one powered sensor, such as a door contact and a motion sensor.
* One powered sensor.
{% hint style="warning" %}
Two powered sensors on a single QX51 are **not supported**. Powered sensors draw 12V from the QX51's AUX terminal, which supports one device.
{% endhint %}
***
## BSP adapter setup
{% stepper %}
{% step %}
Confirm your alarm panel is added to your New Alarms site and is online.
{% endstep %}
{% step %}
**Wire the adapters.**
1. Connect the QX61 to the panel's RS-485 port using a 4-conductor cable.
2. Connect the QX51s:
* Daisy-chain the BSP cable from the QX61 through each QX51.
* If you are using a BP42, daisy-chain the QX51s directly from its onboard BSP port.
Refer to the [QX61](https://docs.verkada.com/docs/QX61-install-guide.pdf) and [QX51](https://docs.verkada.com/docs/QX51-install-guide.pdf) install guides for wiring diagrams and terminal block details.
{% endstep %}
{% step %}
**Add the adapters to Command**.
Either [add the QX61 and QX51 serial numbers to your Command organization](/command/organization-settings/add-a-device-to-your-command-organization.md) and move them from unassigned devices into your Alarm site, or add them through [bulk provisioning](/new-alarms/bulk-provision-wired-alarm-devices.md).
{% endstep %}
{% step %}
On the **Devices** page, select the alarm panel, then select the BSP run for the RS-485 port the QX61 and QX51 are wired to.
{% endstep %}
{% step %}
In the top right, click **Identify** to locate each sensor by triggering it rather than matching devices manually. Use **Identify when** commissioning new or existing runs.
1. Trigger each sensor one at a time. Open the door contact or walk in front of the motion sensor.
2. The triggered sensor appears in Command, where you can name and configure it.
{% endstep %}
{% endstepper %}
---
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