ProdataKey Red Four-Door Expansion Board R4E
Add doors. Keep control.
The R4E is a four-door expansion board for ProdataKey's cloud-managed access control, managed through pdk.io. It gives a growing Red Max system four more doors to run.

Access systems rarely stay at the size you start with.
Projects often begin with a few doors and grow to many. Each new door needs a panel that connects its reader, lock, door contact and exit device.
Built to grow with your system
The R4E is designed to scale a PDK system from a few doors to many.
Self Discoverable
The board is self discoverable, which helps new doors join your system.

Doors per board
One R4E board covers four doors, each with its own reader port.
Plug n' Play Connectivity
Plug n' Play connectivity keeps adding a four-door board simple.
Fully Supervised
The board is fully supervised, with battery charger and statistics included.
OSDP Support
Supports the OSDP protocol and provides four reader input ports.
Everything you need to know.
| Brand | ProdataKey |
| Model | Four-Door |
| Model Name | Red Four-Door Expansion Board |
| Product Line | Red Max |
| Product Type | Door Expansion Module |
| Number of Doors | 4 |
| Application/Usage | Door |
| Color | Red |
| Relays | Industrial-grade 2A Form-C Relays (4) |
| Terminals | Removable Screw-down Terminals |
| Country of Origin | US |
ProdataKey Red Four-Door Expansion Board R4E
The ProdataKey Red Four-Door Expansion Board R4E is part of ProdataKey's (PDK) cloud-managed access control range, managed through pdk.io. It is aimed at security integrators and facility managers building or expanding a PDK system.
A door controller is the panel that connects readers, locks, door contacts and exit devices for each door and makes the unlock decision. ProdataKey controllers connect to the pdk.io cloud platform for setup and management.
Key Features
- Self Discoverable.
- System Scalability.
- Plug n' Play Connectivity.
- Battery Charger and Statistics.
- Fully Supervised.
- Supports OSDP Protocol.
- Four Reader Input Ports.
Specifications
- Brand: ProdataKey
- Model: R4E
- Product Line: Red Max
- Product Type: Door Expansion Module
- Application/Usage: Door
- In the box: redmax Customizable Controller, 2 x eFlow Power Supplies
- Shipping weight: 0.7 lb
Typical Uses
- Adding controlled doors to a ProdataKey cloud access system
- Commercial offices, schools and multifamily buildings
- Projects that will grow from a few doors to many
Please confirm compatibility with your ProdataKey system, reader format (Wiegand/OSDP) and credential technology before ordering.
Need help with compatibility?
Looking for a manufacturer part number, compatible replacement, or quantity order? Contact Raztechs for sourcing and quote support.

ProdataKey Four-Door, ready to order.
- redmax Customizable Controller
- 2 x eFlow Power Supplies
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