Simplex Slave Talk Back Unit Metal Enclosure – Agni 416
The Agni-416 Simplex Slave Talk Back Unit is a half-duplex fire alarm communication between field-implemented locations and the master control panel. Built with a solid sheet metal enclosure and integrated circuit logic, it operates on 15V DC and complies with IS 2189 standards for dependable fire safety communication.
Part Number: AGNI-416 | Category: Hooter/Hooter Flasher/Hooter cum Speaker
Description
The Simplex Slave Talk Back Unit Metal Enclosure (AGNI-416) is a reliable half-duplex communication device engineered for fire alarm control rooms and emergency communication systems. Designed to support coordinated emergency response, this unit allows controlled two-way communication where only one person can speak at a time.
When the slave unit talk button is pressed, the master panel receives a signal from the field unit. The operator selects the corresponding zone line and presses the talk key, enabling the system to switch to “Talk & Listen Mode.” Because users cannot hear incoming communication while speaking, the system operates using the traditional “Over Code Word” protocol to signal conversation handover.
As per IS 2189 installation guidelines, the device should be mounted at a height of 1.4 m ± 0.2 m above finished floor level. It must be installed in clearly visible and accessible locations such as escape routes, near exits, and staircase lobby area to ensure immediate usability during emergencies.
Its rugged solid sheet metal enclosure and integrated circuit logic make it reliable for indoor fire alarm communication installations.
How it Works
How does the Simplex Slave Talk Back Unit Work?
The Agni-416 Simplex Slave Talk Back Unit operates on a half-duplex Press-to-Talk (PTT) communication system designed for fire alarm emergency coordination. In simple terms, only one person speaks at a time. Communication flows in a controlled sequence between the slave unit (field location) and the master control panel.
Commonly Used
- Staircase Emergency
- Escape Routes & Corridors
- Exit Points
- Corridor / lobby
- Fire alarm Control Room Coordination
Step-by-Step Talk Back Unit Working Principle?
01
Activation at Field Location
During an emergency, a person at the installed slave unit process the centre push switch (Push ON / Push OFF)
02
Signal Transmission to Master Panel
The unit sends a signal to the master control panel through its external cable.
03
Zone Selection by Operator
The control room operator receives the signal, selects the corresponding zone line, and presses the talk key.
04
System Switches to "Talk & Listen Mode"
The system enables audio communication using the built-in 8 ohm / 4 Watts speaker. The LED indicator (Red, 120° wide angle) lights up to indicate active talking mode.
05
Half-Duplex Communication
Since it is a half-duplex system: Only one person can speak at a time. While speaking incoming communication cannot be heard. The user says "Over" after speaking to signal handover.
06
Reset After Communication
Once communication is complete, the device can be restored, the broken glass should be replaced with a new glass panel to restore the device for future use
Technical Specification
System Electrical Parameters
|
PARAMETER |
Specification |
|---|---|
|
Part Number |
AGNI-416 |
|
Operating Voltage |
15V DC (±6%) |
|
Operating Temperature |
-2°C to +87°C |
|
Maximum Alarm Current |
35 mA (in case of operation) |
|
Contact Communication |
Integrated Circuit Logic |
|
Centre Push Switch |
Push ON / Push OFF |
|
LED Indicator |
Red Color, Wide Angle 120° |
|
LED Status |
Indicates Status On Talking Mode |
|
Speaker |
8 Ohm / 4 Watts |
Physical & Mechanical Parameters
|
PARAMETER |
Specification |
|---|---|
|
Enclosure Material |
Made Out of 1.2 or 1.6 SWG Solid Sheet Metal Profile |
|
Body Color |
Standard Red |
|
Dimensions (H × W × D) |
222 mm × 132 mm × 62 mm |
|
Net Weight |
1221 g |
|
Shipping Weight |
1301 g (Gross weight with packing) |
|
Protection Category |
Type A - Indoor Use / Rating IP21C |
|
Maximum Tolerated Humidity |
95% RH |
|
Connectors |
External Cable |
|
Fragile Element |
Break Glass 1.8 mm |
|
Break Glass Area |
69 R mm |
|
Glass Size |
78 mm × 78 mm (Standard 1.8 mm Thick Glass) |
Guidelines: As per IS 2189 (aligned with practices similar to BS 5839) Simplex (PTT) Press-to-Talk Back shall be mounted at a height of 1.4 m ± 0.2 m above finished floor level. Devices shall be positioned in conspicuous, unobstructed, and readily accessible locations, typically along escape routes, adjacent to exits, and at staircase landings, to facilitate immediate operation in case of fire emergency (Government Of India CPWD DSR Specification)
Job to be Done
Primary Job
Controlled half-duplex voice communication between field locations and the master control panel, ensuring zone-based coordination, clear status indication, and dependable emergency response during fire incidents.
Safety Job
Safe evacuation by enabling reliable half-duplex emergency communication between occupants and the fire control room, supporting coordinated response, real-time guidance, and compliant fire safety operations.
Operational Job
Allow occupants or security personnel at escape routes, exits, or staircase landings to instantly communicate with the master control panel using a half-duplex Press-to-Talk system operating on 15V DC.
FAQ
What is a Simplex Slave Talk Back Unit?
A Simplex Slave Talk back unit is a fire alarm communication device that enables half-duplex voice communication between field locations and the master control panel during emergencies.
How does the Simplex Press-to-Talk back unit work?
When the centre push switch is pressed, the unit sends a signal to the master panel. The operator activates the selected zone, enabling one-way speaking at a time.
Is the Agni-416 Simplex Talk Back Unit half-duplex or full-duplex?
The Agni-416 simplex talk back unit operates on a half-duplex system, meaning only one person can speak at a time.
Simplex Slave Talk Back Unit Metal Enclosure AGNI-416
AGNI-416 Simplex Slave Talk Back Unit Metal Enclosure with 15V DC operation, half-duplex communication, 8 ohm speaker, IP21C rating, and IS 2189 compliance. Durable metal body, break glass 1.8mm, ideal for fire alarm emergency communication systems.
