AXIS A9210 Network I/O Relay Module (02861-001) – 10-Port Network I/O Expansion Module with Relay Control
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution and frame rate settings. Finally you can often make your storage space last a lot longer by enabling motion detected recording rather than continuous, especially if there are long periods of no activity.
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb we recommend a minimum of 2 Terabytes per 4 x 2-4MP HD cameras, as this should give you 2 weeks to a month with a few adjustments on motion detected recording. You may only require the full 25 frames per second on certain cameras if things are fast moving.
(All of our hard drives come fitted and are CCTV specific from one of the major brands)
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AXIS A9210 Network I/O Relay Module (02861-001) – 10-Port Network I/O Expansion Module with Relay Control.
The AXIS A9210 Network I/O Relay Module (02861-001) is a flexible expansion device designed to extend the capabilities of Axis surveillance and security systems. It provides 10 configurable I/O ports along with a Form C relay output, enabling integration of external sensors, alarm devices, door contacts, and other security components. With support for network-based control and Axis open platforms, it allows seamless event-driven automation and system integration.
Its scalable architecture makes it suitable for complex security installations requiring centralised monitoring and control of multiple inputs and outputs.
Key Features:
10 configurable I/O ports for external device integration
1 Form C relay (wet/dry contact support)
Supports alarm sensors, door contacts, and external triggers
Network-based control via Axis IP systems
Scalable support up to 128 I/Os and 64 relays (multi-device setup)
Compatible with Axis VAPIX and ACAP platforms
Event-driven automation and alarm response support
Easy integration with VMS and access control systems
DIN-rail or wall-mount installation options
Industrial-grade design for security environments
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