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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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We ship via UPS and fastest delivery is with Next Day Air. UPS Next Day Air Early typically gets their product to them as early as 8am, Next Day Air gets their product typically there by 10:30am and Next Day Air Saver typically by 3pm. We ship same day for in stock items and the lead time is up to one week for out of stock items. Delivery is dependent on UPS and your shipping method.

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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

References and Support

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