> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/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/knowledge-hub/deployment-resources/install-and-commission/hardware-install-notes/i-o-expansion-install-notes.md).

# I/O expansion install notes

Find installation notes for Gallagher HBUS and OSDP input and output devices.

Install notes for HBUS and OSDP input and output modules, boards, and hubs, and the decal labels that go with them.

| Product                                    | Install note                                                                                                                                                                                         |
| ------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| HBUS 8 In 2 Out Door Module                | [3E3472 Install Note HBUS 8 In 2 Out Door Module](https://media.gallagher.com/m/246b2f5033d5ee34/original/3E3472-Install-Note-HBUS-8-In-2-Out-Door-Module.pdf)                                       |
| HBUS 8 In 2 Out Door Module Decal          | [3E3576 HBUS 8 In 2 Out Door Module Decal](https://media.gallagher.com/m/3c5655a99bc1c917/original/3E3576-HBUS-8-In-2-Out-Door-Module-Decal.pdf)                                                     |
| HBUS 4 In 2 Out Door Module, Wiegand       | [3E4597 Install Note HBUS 4 In 2 Out Door Module Wiegand](https://media.gallagher.com/m/5d34868581fd0dd4/original/3E4597-Install-Note-HBUS-4-In-2-Out-Door-Module-Wiegand.pdf)                       |
| HBUS 4 In 2 Out Door Module, Wiegand Decal | [3E4598 HBUS Universal Reader Interface Wiegand Variant Decal Label](https://media.gallagher.com/m/7c6640eb7dd4b9a3/original/3E4598-HBUS-Universal-Reader-Interface-Wiegand-Variant-Decal-Label.pdf) |
| HBUS 8 In Board                            | [3E3475 Install Note HBUS 8 In Board](https://media.gallagher.com/m/429af82014d8e981/original/3E3475-Install-Note-HBUS-8-IN-Board.pdf)                                                               |
| HBUS 8 In Board Decal                      | [3E3579 HBUS 8 In Board Decal](https://media.gallagher.com/m/6a8f7509cc612f5/original/3E3579-HBUS-8-In-Board-Decal-R2.pdf)                                                                           |
| HBUS 8 In 4 Out Board                      | [3E3474 Install Note HBUS 8 In 4 Out Board](https://media.gallagher.com/m/617098e8139778be/original/3E3474-Install-Note-HBUS-8-IN-4-OUT-Board.pdf)                                                   |
| HBUS 8 In 4 Out Board Decal                | [3E3578 HBUS 8 In 4 Out Board Decal](https://media.gallagher.com/m/14af29b7bf27327b/original/3E3578-HBUS-8-In-4-Out-Board-Decal.pdf)                                                                 |
| HBUS 16 In 16 Out Board                    | [3E3473 Install Note HBUS 16 In 16 Out Board](https://media.gallagher.com/m/7b247bf919dc325f/original/3E3473-Install-Note-HBUS-16-In-16-Out-Board.pdf)                                               |
| HBUS 16 In 16 Out Board Decal              | [3E3577 HBUS 16 In 16 Out Board Decal](https://media.gallagher.com/m/b23939733c6672f/original/3E3577-HBUS-16-In-16-Out-Board-Decal.pdf)                                                              |
| HBUS 8 Port Hub                            | [3E4465 Install Note HBUS 8 Port Hub](https://media.gallagher.com/m/1f436ab56c7d311e/original/3E4465-Install-Note-HBUS-8-Port-Hub.pdf)                                                               |
| OSDP 8 Port Hub                            | [3E5775 Install Note OSDP 8 Port Hub](https://media.gallagher.com/m/28888609c038c6fd/original/3E5775-Install-Note-OSDP-8-Port-Hub.pdf)                                                               |
| GBUS URI                                   | 3E0690 Gallagher GBUS URI Install Note                                                                                                                                                               |
| GBUS URI Wiegand                           | 3E0974 Gallagher GBUS URI Wiegand Install Note                                                                                                                                                       |
| 8-Input Expansion Interface                | 3E0391 Gallagher 8-Input Expansion Interface Install Note                                                                                                                                            |
| I/O Expansion Interface                    | 3E0377 Gallagher I/O Expansion Interface Install Note                                                                                                                                                |
| High Density I/O Expansion Interface       | 3E1784 Gallagher High Density I/O Expansion Interface Install Note                                                                                                                                   |

The last five entries are archived documents. They are listed by document number so you can request the right revision.


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