Single Input, Single Output, 4 selectable Tone, Piezo Transducer Alarm Siren.  Communicable over Wi-Fi and Modbus TCP.  NOT for use in US.


Single Input, Single Output, 4 selectable Tone, Piezo Transducer Alarm Siren. Communicable over Wi-Fi and Modbus TCP. NOT for use in US.

  Price:  $209.00  

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  • Standard Alarm Siren or with Wi-Fi, RS-485 interface
  • Modbus TCP, Modbus RTU protocol
  • Photo couple input, Open Collector output
  • Wide power supply range
  • Wide operating temperature range
  • Piezo Transducer Output
  • Water clear upper cover with 8 Ultra-Bright RED LED, or -BR version with 8 Blue + 8 Red Ultra-Bright LED
  • 4 Selectable Alarm Tone
  • NC/NO Input Selectable



The ALM-Horn Series include 3 models, -BR with water clear upper cover, Blue + Red LED, ALM-Horn as standard siren, ALM-Horn-WF have WLAN connection complies with the IEEE802.11b/g/n standards, support Modbus TCP protocol & HTML, ALM-Horn-MRTU have RS-485 interface support Modbus RTU protocol.

ALM-Horn series device include 1-channel digital input for any dry contact output such as SA, BA, FA..etc, and 1-channel digital output Each device has 4 kinds of alarm tone, NC/NO input mode select by switchs. The ALM-Horn-WF & -MRTU support Modbus protocol, Which makes perfect integration for monitoring or control in SCADA software, HMI Modbus & Utilitys. ALM-Horn series have High Sound Pressure output, wide input power range & IP43 waterproof.


EMS Protection
EFT (IEC 61000-4-4) ±2 kV for Power Line
ESD (IEC 61000-4-2) ±8 kV Contact for each Terminal
LED Indicators
Status 2 colors LED, Blue for System status, Red for Alarm status.
Digital Input/Counter
Channels 1
Type Dry Contact: Sink
Dry Contact, ON Voltage Level Close to GND
Dry Contact, OFF Voltage Level Open
Isolation 3750 VDC
Digital Output
Channels 1
Type Open Collector (Sink)
Load Voltage +3.5 VDC ~ +30 VDC
Max. Load Current 400 mA
Alarm Output
LED Water clear upper cover with 8 RED UltraBright RED LED
-BR: With 8 Blue + 8 RED UltraBright LED
LPiezo Transducer Pressure Level 120 ±5 dB @10cm/3.0 KHz (W/O waterproof membrane)
Dip Switch
Mode SW1,2: Include 4 kinds of alarm Tone, SW4:Input Mode (NO/NC) select
COM Port
Ports 1 x RS-485
Baud Rate 300 ~ 115200 bps
Data Format Data bit: Odd
Stop bit: Even, 8, 1/2
Protocol Modbus RTU
Input Range 12 ~ 48 VDC with Reverse Protection (Vin to GND)
Consumption 0.48 W Standby.
Dimensions (mm) 119 x 119 x 48 (W x L x H)
Installation Panel Mount/
Wall Mount
Ingress Protection Rating IP43
Operating Temperature -20 ~ +75°C

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