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DefendX Systems

Field transmitter

DefendX Node

Four-Channel TCP/IP Fire Alarm Relay Status Transmitter

A universal Ethernet transmitter designed to monitor Fire, Fault, Supervisory and panel power status from one fire alarm control panel and transmit the information to DefendX M32 in real time.

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Input interface

Four Monitored Conditions per Panel

Fire Relay

Isolated dry-contact input

Fault Relay

Isolated dry-contact input

Supervisory Relay

Isolated dry-contact input

24 V Panel Power

Isolated 18–30 V DC sensing circuit

Fire, Fault and Supervisory inputs are isolated dry-contact inputs. The panel power input is an isolated 18–30 V DC sensing circuit and is never used to power the Node.

Specifications

Main Specifications

DefendX Node main specifications
FeatureSpecification
Fire inputIsolated volt-free relay contact
Fault inputIsolated volt-free relay contact
Supervisory inputIsolated volt-free relay contact
Panel power inputIsolated 18–30 V DC sensing
Contact logicConfigurable NO or NC
DebounceIndividually configurable
Power inputIndependent 18–30 V DC
Ethernet10/100 Mbps RJ45
NetworkStatic IPv4 and DHCP
ProtocolMQTT or structured TCP/IP
ConfigurationEmbedded password-protected web page
HeartbeatDefault 5 seconds
RecoveryAutomatic reconnection and status resynchronization
ProtectionReverse polarity, surge and overvoltage
WatchdogHardware and software
OperationContinuous 24×7
MountingDIN rail or wall mounting

Why independent power matters

  • The DefendX Node should normally be powered from an independent UPS-backed 24 V supply.
  • The monitored fire alarm panel's 24 V output is connected only to the isolated sensing input.
  • This allows the Node to continue operating and report a panel power failure when the fire alarm panel's auxiliary voltage disappears.
UPS 24 V DC  ──► Node power input (operational supply)
Panel 24 V   ──► Node isolated sensing input (monitored only)

Communication sequence

  1. 1Relay changes
  2. 2Input is verified (debounce)
  3. 3Node creates structured status message
  4. 4Message is transmitted through TCP/IP
  5. 5M32 updates LED and relay outputs
  6. 6All web clients receive the new status
  7. 7Event is recorded

Configuration

Embedded Configuration Page

Concept visualization of the Node's password-protected embedded web interface.

DefendX Node embedded configuration fields
ParameterValue
Device IDDXN-007
Panel number07
Panel nameProduction Block
LocationBuilding B – Ground Floor
AddressingStatic IPv4
IP address192.168.1.107
Subnet mask255.255.255.0
Gateway192.168.1.1
M32 controller IP192.168.1.10
Communication port8883
Input logicFire NO · Fault NC · Supervisory NO
Input debounce300 ms
Heartbeat interval5 s
Current input statesFire ACTIVE · Fault NORMAL · Supervisory NORMAL
Ethernet statusLink up, 100 Mbps full duplex
Last message time2 seconds ago
Firmware version1.0.0
Uptime27 d 04 h 18 m
Restart count1

Maintenance actions

Reboot deviceBackup configurationRestore configuration

Status LEDs

PowerSystem HealthyEthernet LinkCommunicationFireFaultSupervisoryPanel PowerInternal Fault

Concept Product Visualization

Resilience

Network Recovery

Automatic Ethernet reconnection

Automatic server reconnection

Five-second heartbeat

Sequence-number monitoring

Full status transmission after reconnect

Hardware watchdog

Configuration retention after power failure

Safe network recovery mode

Enquiry

Request Node Pricing

Pair the Node with DefendX M32

One Node per fire alarm panel, one M32 for the entire facility, and a complete recorded picture of every monitored condition.

View DefendX M32See the architecture