Data Sheet

Analog Station Port FXS Doorphone & Intercom for Visitor Entry – Integrated Door / Gate Control Relay

The 3228 Station Port FXS Doorphone is a telephone-integrated door and gate entry security intercom for visitor and guest communication. The intercom integrates door opening control using the convenience of a telephone key pad for activation. The 3228 is fully rated for outdoor use in commercial or residential applications.

The 3228 integrates with a CO line or more commonly with a telephone system via an analog station (FXS) port or ATA. The intercom is full duplex capable, featuring echo cancellers and adaptive noise reduction for superior voice quality compared to most analog systems. Convenient single twisted pair wiring to the door station enables fast and easy installation for a new system or retrofit/upgrade of an existing intercom.

The 3228 door control relay can connect to any type of door release, gate activation system or access control panel. The intercom includes a 24 V 0.3 A power source for low power 24 V door strikes (customer provided). Additionally, there are low current programmable inputs and outputs at both control unit and intercom station for door sensing, door unlock switch, door unlock override, auxiliary call buttons, or telephone status such as ringing or in-use.

Algo Intercom Outside Wall Flush Mount Installation

The 3228 kit includes the following: Door Station with a stainless steel face plate (brass is also available for purchase as a separate item), Controller with 24V power supply, and a bezel for surface mounting. Please note that the Door Station can flush mount into a standard dual gang box. Mounting gaskets are included in the kit for installing the intercom in any outdoor environment.

How it Works

  • Visitors press the backlit call button on the 3228 door station intercom to initiate calling to a pre-configured outgoing dial number
  • Answering the intercom call enables two-way communication with the visitor
  • Pressing a pre-configured door open code (e.g. digit 6) from the telephone or device (e.g. mobile or wireless phone, soft client on a tablet or laptop) during the intercom call, will activate the 3228 door control relay to allow momentary unlock of the entrance for the visitor to gain access through the door or gate


Single Pair Digital Door Station

  • Digital speech technology provides superior voice quality
  • Single pair 24 AWG wiring up to 1,000 Ft (300 m) between door station and controller for easy new or retrofit installations
  • Initiates or accepts calls
  • Caller Line ID to telephone helps users easily differentiate door calls from standard call
  • Flush or surface mount (i.e., dual gang)
  • Backlit call button for ease of use during night time hours
  • CSA/UL 3R weather resistant

Security & Safety

  • Door control relay located securely inside the premise at the controller location
  • Available 24 V 300 mA strike power
  • Supervised link to door station monitors fault conditions

Auxiliary Relay Inputs & Outputs

  • Programmable relay inputs and outputs at controller and door station for integrating accessories such as: door sensor, doorbell button, card swipe, door chime, loud ringer, strobe, etc.
  • Configurable through software via USB, or by telephone through touch-tone (DTMF) commands

Typical Applications

  • Secure business and institutional entrances such as a school, day care, hospital, delivery entrance, dock, warehouse, man trap, prison, outdoor yard, etc.
  • Access control for a hospital (e.g. ward, lab, etc.), assisted living/retirement home, airport, hotel/resort, casino, etc.
  • Business, institutional and residential gate entrances
  • Intercom for emergency (e.g. elevator) and non-emergency access points (e.g. interview or examination room)

Typical Connection Diagram

Typical diagram - 3228 FXS Doorphone


Item Description
Interface Connect to FXS gateway or telephone system analog station port
Door Control
Contact Rating Maximum 30 V, 1 Amp
Contact Type 1 Form C; Normally Open and Normally Closed
Duration Programmable, including latch
Activation DTMF, programmable
Auxiliary Power 24 Vdc, current limited to 300mA
Terminal Block Wiring 12-26 AWG
Control Unit (3228 Doorphone Controller)
Number & Type 4 isolated solid state relays
Connection 2.5 mm jack
Voltage Max 30 V SELV
Current Max 50 mA non-inductive
Functions Ring, In-Use, or Message Waiting
Door Station (3201/3202/3203)
Wiring Single pair, normally 24 AWG twisted 1,000 feet (300 m);
Please contact Algo for longer loop lengths.
Dry Contact Output Maximum 30 V, 50 mA switching (programmable function)
Dry Contact Input Contact detected using 24 Vdc 1 mA (programmable function) Maximum resistance 1 kOhm
Operating Temp. -30 to 50 C (-22 to 122 F)
Weather Resistance CSA/UL 3R weather resistant
Call Button Sealed, backlit
Faceplate 304 Stainless Steel (3201); Brass optional (3202); Vandal-Proof (3203)
Method DTMF or USB Port using configuration software
Power Requirement
Typical (idle) 1 Watt
Maximum 10 Watts (Audio active, door contacts using 24 V, 0.3 A auxiliary supply)

Product Dimensions

Door Station

3228 Door Station


3228 Controller

  • In the interests of continual product development, specifications are subject to change without notice. Some features may only be available in specific firmware or hardware releases.