The alarmdecoder integration will allow Home Assistant users who own either a DSC or Honeywell alarm panel to leverage their alarm system and its sensors to provide Home Assistant with rich information about their homes. Connectivity between Home Assistant and the alarm panel is accomplished through a device produced by Nu Tech Software Solutions, known as the AlarmDecoder. The AlarmDecoder devices provide a serial, TCP/IP socket or USB interface to the alarm panel, where it emulates an alarm keypad.

Please visit the AlarmDecoder website for further information about the AlarmDecoder devices.

There is currently support for the following device types within Home Assistant:

  • Binary Sensor: Reports on zone status
  • Sensor: Emulates a keypad display
  • Alarm Control Panel: Reports on alarm status, and can be used to arm/disarm the system

This is a fully event-based component. Any event sent by the AlarmDecoder device will be immediately reflected within Home Assistant.


An alarmdecoder section must be present in the configuration.yaml file and contain the following options as required:

# Example configuration.yaml entry
    type: socket
    port: 10000
  panel_display: false
      name: 'Smoke Detector'
      type: 'smoke'
      rfid: '0123456'
      name: 'Front Door'
      type: 'opening'

Configuration Variables

device listRequired

List of variables for the AlarmDecoder device.

type stringRequired, default: socket

The type of AlarmDecoder device: socket, serial or USB.

host string(Optional, default: localhost)

The IP address of the AlarmDecoder device on your home network, if using socket type.

port integer(Optional, default: 10000)

The IP address of the AlarmDecoder device on your home network, if using socket type.

path string(Optional, default: /dev/ttyUSB0)

The path of the AlarmDecoder device, if using serial type.

baudrate string(Optional, default: 115200)

The baud rate of the AlarmDecoder device, if using serial type.

panel_display boolean(Optional, default: false)

Create a sensor called sensor.alarm_display to match the Alarm Keypad display.

autobypass boolean(Optional, default: false)

Honeywell only. Set to true, to automatically bypass all open zones (sending 6#) when arming. This will require a code to be entered even if code_arm_required is set to false.

code_arm_required boolean(Optional, default: true)

Set to false to enable arming without having to enter a code.

zones list(Optional)

AlarmDecoder has no way to tell us which zones are actually in use, so each zone must be configured in Home Assistant. For each zone, at least a name must be given. For more information on the available zone types, take a look at the Binary Sensor documentation. Note: If no zones are specified, Home Assistant will not load any binary_sensor integrations.

name stringRequired

A name for the zone.

type string(Optional, default: opening)

A type for the zone. Here you can find a list of Device Classes.

rfid string(Optional)

The RF serial-number associated with RF zones. Providing this field allows Home Assistant to associate raw sensor data to a given zone, allowing direct monitoring of the state, battery, and supervision status.

loop integer(Optional)

The loop number associated with RF zones (1, 2, 3, or 4). Providing this field allows Home Assistant to read open/closed status from the raw sensor data in addition to from the panel display, meaning it can correctly show a bypassed RF zone as open or closed when the alarm is armed. (This is an alternative to relayaddr/relaychan below for RF zones.)

relayaddr integer(Inclusive)

Address of the relay or zone expander board to associate with the zone. (ex: 12, 13, 14, or 15). Typically used in cases where a panel will not send bypassed zones such as motion during an armed home state, the Vista 20P is an example of this. AlarmDecoder can emulate a zone expander board and the panel can be programmed to push zone events to this virtual expander. This allows the bypassed zone binary sensors to be utilized. One example is using bypassed motion sensors at night for motion-based automated lights while the system is armed with the motion sensor bypassed.

relaychan integer(Inclusive)

Channel of the relay or zone expander board to associate with the zone. (ex: 1, 2, 3, or 4 for relay expander boards, 1 - 8 for zone expander boards)

Alarm Control Panel

There are several attributes available on the alarm panel to give you more information about your alarm.

  • ac_power: Set to true if your system has AC power supplying it.
  • alarm_event_occurred: Set to true if your system was recently triggered. When alarm_event_occurred is true, it must be cleared by entering your code + 1 (or calling the alarm_control_panel.alarm_disarm service) before attempting to arm your alarm.
  • backlight_on: Set to true if your keypad’s backlight is on.
  • battery_low: Set to true if your system’s back-up battery is low.
  • check_zone: Set to true if your system detects a problem with a zone.
  • chime: Set to true if your system’s chime is activated. When activated, your system will beep anytime a door or window is faulted while the alarm is disarmed.
  • entry_delay_off: Set to true if your system is in “Instant” mode, meaning the alarm will sound on any faults.
  • programming_mode: Set to true if your system is in programming mode.
  • ready: Set to true if your system is ready to be armed. Any faults, including motions sensors, will make this value false.
  • zone_bypassed: Set to true if your system is currently bypassing a zone.
  • code_arm_required: Set to the value specified in your configuration.


The Alarm Decoder integration gives you access to several services for you to control your alarm with.

  • alarm_arm_away: Arms the alarm in away mode; all faults will trigger the alarm.
  • alarm_arm_home: Arms the alarm in stay mode; faults to the doors or windows will trigger the alarm.
  • alarm_arm_night: Arms the alarm in instant mode; all faults will trigger the alarm. Additionally, the entry delay is turned off on the doors.
  • alarm_disarm: Disarms the alarm from any state.
  • alarmdecoder.alarm_keypress: Sends a string of characters to the alarm, as if you had touched those keys on a keypad.
  • alarmdecoder.alarm_toggle_chime: Toggles the alarm’s chime state.

alarm_arm_custom_bypass and alarm_trigger, while available in the services list in Home Assistant, are not currently implemented in the Alarm Decoder platform.


Using a combination of the available services and attributes, you can create switch templates.

Chime Status and Control

- platform: template
      friendly_name: Chime
      value_template: "{{ is_state_attr('alarm_control_panel.alarm_panel', 'chime', true) }}"
        service: alarmdecoder.alarm_toggle_chime
          code: !secret alarm_code
        service: alarmdecoder.alarm_toggle_chime
          code: !secret alarm_code
      icon_template: >-
          {% if is_state_attr('alarm_control_panel.alarm_panel', 'chime', true) %}
          {% else %}
          {% endif %}

Arming Key Sequences

The tables below show the key press sequences used for arming for the different panel brands and configuration setting combinations. They are taken from the adext PyPI package.


code_arm_required = true (default)

Mode Key Sequence
alarm_arm_home code + 3
alarm_arm_away code + 2
alarm_arm_night code + 7

code_arm_required = false

Mode Key Sequence
alarm_arm_home #3
alarm_arm_away #2
alarm_arm_night #7


code_arm_required = true (default)

Mode Key Sequence
alarm_arm_home code
alarm_arm_away code
alarm_arm_night code

code_arm_required = false

The chr(4) and chr(5) sequences below are equivalent to pressing the Stay and Away keypad keys respectively (as outlined in the AlarmDecoder documentation).

Mode Key Sequence
alarm_arm_home chr(4) + chr(4) + chr(4)
alarm_arm_away chr(5) + chr(5) + chr(5)
alarm_arm_night chr(4) + chr(4) + chr(4)