---
title: Hardware specs
description: Omni Pro II controller capacities, electrical specs, environmental ranges, and expansion limits — distilled from HAI's official product spec sheet and installation manual.
---

The numbers below are the Omni Pro II controller's hardcoded capacity
ceilings: the protocol's `RequestProperties` / `RequestStatus` ranges, the
`SystemStatus` payload size, the .pca file's fixed-size names tables, and
every cap in `clsCapOMNI_PRO_II.cs` derive from these. They're the
reason `OmniClientV1` chunks polls and uses the long-form
`RequestUnitStatus` for unit numbers above 255 — see
[zone & unit numbering](/explanation/zone-unit-numbering/) for the address
layout that yields those high numbers.

References for everything on this page: HAI's *OmniPro II Product
Specifications* (part 20A00-2, 2012-10) and *OmniPro II Installation
Manual 3.2*, both available from
[quadomated.com](https://www.quadomated.com/technology/automation/home-automation-controller-hai-omnipro-ii/).

## Capacity ceilings

What the controller can address at most — these set the upper bounds for
every typed entity in HA.

| Object | Limit | Notes |
|---|---:|---|
| Zones | 176 | 16 onboard + 160 across expansion |
| Hardwire zone expansions (10A06) | 2 | 16 zones each → 32 |
| Expansion enclosures (17A00) | 8 | 16 zones + 16 outputs each |
| Units (lighting addresses) | 511 | X-10 / ALC / HLC / outputs / flags combined |
| Areas | 8 | true partitioning |
| Thermostats (Omnistat2) | 64 | |
| Buttons (named macros) | 128 | |
| Lighting scenes | 128 | |
| Programs | 1500 | |
| User codes | 99 | |
| Messages | 128 | stored on panel |
| Consoles (LCD keypads) | 16 | |
| OmniTouch 5.7e (IP) | 16 | |
| Access control card readers | 16 | |
| Access cards / keytags | 99 | |
| Serial ports (onboard) | 5 | |
| Serial expansion total | 6 | with one expansion |
| 12 V trigger outputs (with expansion) | 8 (136) | |
| Vocabulary words (built-in) | 550 | plus custom vocabulary |
| Battery standby (typical) | 24 hours | with derated outputs (see below) |

## Communicator + comms

| Field | Value |
|---|---|
| Built-in digital communicator | yes |
| Reporting formats | Contact ID, 4/2, 3/1 |
| Extra phone numbers for voice notify | 8 |
| Ethernet port | yes (built-in, 100 Mbit) |
| Flash memory | yes (field firmware updates) |
| Network port | UDP and TCP on 4369 by default |

## Electrical

From the installation manual's *Specifications* chapter (p64).

| Parameter | Value |
|---|---|
| Mains | 120 VAC, 60 Hz, 60 W |
| Transformer | 24 VAC, 1.67 A, 40 VA |
| Battery (backup) | 12 V, 7 Ah, sealed lead-acid |
| Nominal DC bus | 10 – 13.7 VDC (≤0.5 Vpp ripple) |
| Low-voltage cut-out | ≈9 VDC |
| Device fuse | polyfuse, 1.35 A |
| Horns fuse | polyfuse, 1.35 A |
| Battery fuse | polyfuse, 4.00 A |

Polyfuses self-reset; no field replacement needed.

### Per-output current (max)

| Output | Max current |
|---|---:|
| AUX 12 V (one source) | 1.0 A |
| SWITCH 12 V (one source) | 1.0 A |
| CONSOLE bus | 1.0 A |
| OUTPUTS 1-8 (each) | 100 mA |
| **Combined: AUX + SWITCH + CONSOLE + OUTPUTS 1-8** | **1.0 A total** |
| INT HORN + EXT HORN combined | 1.0 A |

### Derated for 24-hour battery standby

If the install needs to run for 24 h on the backup battery alone:

| Output group | Combined max |
|---|---:|
| AUX 12 V + SWITCH 12 V + CONSOLE + OUTPUTS 1-8 | 250 mA |
| INT HORN + EXT HORN | 300 mA |

Typical current at nominal voltage:
- Controller idle: 135 mA
- LCD console: 35 mA backlight off, 100 mA backlight on

## Physical

| Item | Dimensions | Weight |
|---|---|---|
| Controller (W × H × D) | 13″ × 13″ × 4.5″ | ≈10 lb |
| LCD console (W × H × D) | 4.6″ × 4.5″ × 1.2″ | ≈0.5 lb |

## Environmental

| Parameter | Range |
|---|---|
| Operating temperature | 32 °F – 122 °F (0 °C – 50 °C) |
| Operating humidity | 10 – 95 % RH, non-condensing |

## Listings

* UL Listed residential burglar + fire
* SIA CP-01 compliant (false-alarm-reduction)
* California Title 24 compliant
* 3-year warranty (HAI)

## Languages

Built-in (selectable at install time):

English (default), Latin American Spanish, European Spanish, Catalan,
Italian, French, Traditional Chinese, Simplified Chinese.

## Part numbers

| Part | Description |
|---|---|
| 20A00-2 | OmniPro II with steel enclosure |
| 20A00-8 | OmniPro II on mounting plate (for structured-wiring cans) |
| 20A00-21 | OmniPro II board only |
| 10A06-1 | 16-zone hardwire expansion board |
| 17A00 | 16-zone / 16-output expansion enclosure |
| 42A00-1 | Wireless receiver |
| 45A00-1 | Wireless receiver (alt model) |