> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/smb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/smb/help-resources/troubleshooting/controller-offline-alarm.md).

# Gallagher Hardware

**What do I do if the I/O Boards are going offline randomly?**

Check the following that could cause HBUS devices that are going offline intermittently:

* Wiring connections,
* HBUS terminations are at the ends of the bus - nothing terminated in the middle of the bus,
* Devices are wired in a daisy chain - no star wiring.
* System’s power consumption – do they have sufficient battery power to support what is wired into the board.

**HBUS Devices are not coming online but the Controller has detected the device and has events.**

If a Controller is repeatedly generating a lot of these events: Controller 1 has detected a device.  This indicates a probable issue with one or more of the connected HBUS devices.

Possible causes are:

* Faulty wiring that is causing HBUS device(s) to reconnect constantly.
* Not enough power to HBUS devices - if they are being powered from the Controller, the bus length may cause a significant voltage drop.  A separate power supply may be needed.
* Serial number entered for the wrong kind of device, e.g. using a T15 reader serial number for a T30 reader

**I'm trying to delete a HBUS device and getting the message "**<mark style="color:red;">**Can't delete**</mark>**"**

You can't delete hardware that is currently used by something else in the system.  This is just to ensure people don't get surprised or confused by a mis-configured controller.

First thing to check is that nothing on that device is used anywhere in the sites configuration.&#x20;

**Which SMB kit should I use? (New Zealand & Australia).**

<table data-header-hidden><thead><tr><th></th><th></th><th width="134"></th><th></th></tr></thead><tbody><tr><td><p> </p><p><strong>SMB Kit</strong></p><p> </p></td><td><p> </p><p><strong>Usable Inputs</strong></p><p> </p></td><td><p> </p><p><strong>Outputs</strong></p><p> </p></td><td><p> </p><p><strong>Note</strong></p><p> </p></td></tr><tr><td><p> </p><p>SMB BASE KIT - T11 or T15 or T30</p><p> </p></td><td><p> </p><p>14</p><p> </p></td><td><p> </p><p>4</p><p> </p></td><td><p> </p><p>2 Inputs used for Mains &#x26; Battery Status</p><p> </p></td></tr><tr><td><p> </p><p>SMB BASE KIT - T11 or T15 or T30 x2</p><p> </p></td><td><p> </p><p>14</p><p> </p></td><td><p> </p><p>4</p><p> </p></td><td><p> </p><p>2 Inputs used for Mains &#x26; Battery Status</p><p> </p></td></tr><tr><td><p> </p><p>SMB BASE KIT - T15 BLACK + T30 BLACK</p><p> </p></td><td><p> </p><p>14</p><p> </p></td><td><p> </p><p>4</p><p> </p></td><td><p> </p><p>2 Inputs used for Mains &#x26; Battery Status</p><p> </p></td></tr><tr><td><p> </p><p>SMB 4 Door Kit *4 T15 Black</p><p> </p></td><td><p> </p><p>14</p><p> </p></td><td><p> </p><p>16</p><p> </p></td><td><p> </p><p>2 Inputs used for Mains &#x26; Battery Status</p><p> </p><p>Provision to add an extra 8In Board</p><p> </p></td></tr><tr><td><p> </p><p>SMB 6 Door Kit *6 T15 Black</p><p> </p></td><td><p> </p><p>14</p><p> </p></td><td><p> </p><p>16</p><p> </p></td><td><p> </p><p>2 Inputs used for Mains &#x26; Battery Status</p><p> </p><p>Provision to add an extra 8In Board</p><p> </p></td></tr><tr><td><p> </p><p>SMB 8 Door Kit *8 T15 Black</p><p> </p></td><td><p> </p><p>22</p><p> </p></td><td><p> </p><p>16</p><p> </p></td><td><p> </p><p>2 Inputs used for Mains &#x26; Battery Status</p><p> </p></td></tr><tr><td><p> </p><p>SMB 10 Door Kit *10 T15 Black</p><p> </p></td><td><p> </p><p>22</p><p> </p></td><td><p> </p><p>16</p><p> </p></td><td><p> </p><p>2 Inputs used for Mains &#x26; Battery Status</p><p> </p></td></tr></tbody></table>

***

**When a user disarms using the T30, it creates a tamper event**

If continuously happening, this generally refers to an issue of how the T30 has been mounted.

The correct type of screws need to be in all four corners for the device to be mounted to reduce tampers.  Refer to the [T30 Keypad Reader Installation Note](https://media.gallagher.com/m/4af0b2577b5e6818/original/3E5199-Install-Note-T30-Reader.pdf).


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