HWg-SNMP Web relay (Model: Damocles MINI)

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Damocles MINI is Web-relay with 4 digital inputs and control 2 NO/NC relay outputs over the Web and M2M (SNMP, XML, Modbus/TCP). Dry contact event email or SNMP Trap alert.

Control two remote relays and four digital inputs (dry contacts) with a Web interface. Switch a relay or check the input states over an IP network.

The Damocles MINI is a SNMP / WEB relay that is typically used to remotely switch On/Off other devices or to measure energy consumption (using pulse counters at the inputs).
When an input contact is closed, Damocles sends an email with customized text. Optionally, the email can be sent after a defined delay (for example, to send an alert if a freezer door stays open for more than 5 minutes).

A typical application is the sending of an email based on Dry contact inputs, remote restart or remote relay control. Relay outputs can be controlled over M2M protocols SNMP, XML over http or Modbus/TCP.

  • 4 DI digital inputs for contact connecting
  • 2 DO relay outputs relay contacts (NC and NO)
  • Sensor value out of range: sending Email or SNMP Trap to several recipients.
Damocles MINI - Web-relay, SNMP
foto 1   foto 2    foto 3  

Damocles MINI Flyer


  • Ethernet: RJ45 (10BASE-T)
  • WEB: Built-in web server
  • Inputs: 4 digital inputs (dry contact)
  • Pulse Counter: 32. bit counter on each Digital Input (for connecting S0 pulses)
  • Outputs: 2 digital outputs (relays, 24VDC)
  • Box-2-Box mode: Outputs are activated by alerts from other devices (Poseidon / Damocles)
  • M2M communication protocols: SNMP, XML, Modbus/TCP
  • Reaction to changes at the input: SNMP trap, Email (editable text)
  • Mechanical: dimension 35 x 102 x 76 [mm] 

  • Support for programmers: HWg SDK
  • I/O over EthernetSupported software
    • HWg-PD Trigger: Controls other IP devices, redirects alarms to SMS
    • HWg-PDMS: Logging,conversion of pulses to energy, export to MS Excel, reports
    • CapTemp: Visualization on a map, control of outputs, alarm redirection to SMS
    • >> Third-party SNMP software
      (Nagios, The Dude, Zabbix, IBM Tivoli, HP OpenView, OpManager, IMM (Intellipool Network Monitor), Monitor one, Cacti, MRTG, Opsview, LoriotPro, Axence nvision, Ipswitch WhatsUp, Paessler IPCheck, MSC Operations Manager 2007)

Box-2-Box mode

box-2-box, SNMP Trap - Damocles 1208, remote output control, I/O over EthernetChanges at a dry contact input of one device (A) are sent over the network (SNMP Trap) and reflected at the relay output of the other device (B). Damocles MINI can react to changes at the inputs of another Poseidon or Damocles unit (without any additional software).

Too high temperature in the datacenter (measured by Poseidon 3266) turns on a warning red light in the IT department in another building (relay output of Damocles MINI).

AN37: Box-2-Box Connection: Poseidon >> Damocles


  • Control the relay over network – switch relay by three clicks on the mouse
  • Remote Web-Relay controlled over IP (snmp / xml / Modbus/TCP)
  • Pulse counter: energy consumption measurement over IP.
    Reading of the consumption in time from electrometers, flow meters, gas meters, ..
  • Monitoring of sensors of door opening, motion detectors, dangerous gas, etc.
  • Connecting of external inputs to SCADA systems
  • Remote control over IP – Opening of entry points (doors, gates, pikes and connecting of passage sensors)
  • Monitoring of back-up power supply like UPS and Diesel-engines
  • Camera systems (door contacts, PIR sensors)
  • Measurement of number of persons/vehicles – counting of indoor state and number of passage of persons/vehicles

Which software to use

    HWg-PDMS: cabinet temperature monitoring system

  • Configuration: UDP Config  – IP address configuration
  • Event processing: PD Trigger – reacts to events
  • Monitoring and logging: HWg-PDMS – Monitoring software with MS Excel reporting
  • Simple Visualization: SNMPcap – I/O and sensors
  • Visualization: CapTemp – Process monitoring and control
  • Command line control: PosDamIO – Command-line control of inputs and outputs (see AN29)
  • Other applications: Third-party software for Poseidon & Damocles
  • For programmers: HWg-SDK contains interface descriptions and examples of using M2M protocols in several programming languages
    (JAVA, PHP, Borland C++ Builder 6.0, Microsoft Visual C++ 6.0, Borland Delphi 6.0, Microsoft Visual Basic & Excel VBA, VB.NET, C code for Linux, JavaScript (AJAX) Microsoft Visual C# 2005 (.NET)


relay control remote, web relay snmp, remote restart, remote relay, modbus tcp relay, remote reboot, M2M IP relay
  • WEB (HTML)
    The state of digital inputs and outputs is displayed on WWW page. The page is automatically reloaded every 5 seconds. On the main HTML page there are links to Flash Setup, update FirmWare and others..
  • XML
    All values, the information about alarm state including, are accessible in .XML file (values.xml) and any application can easily log it from XML tags – more informations..
  • SNMP
    SNMP is protocol for management of telecommunication devices, network infrastructure and related technologies. Damocles is fully controlled over SNMP – more informations..
  • Modbus/TCP
    Modbus/TCP is industry standard for input of sensor values and sensors into visualization and SCADA systems. All sensors values are accessible over Modbus/TCP – more informations..
  • Alarms
    • SNMP Traps
      In a case of Alarm, the device will send you SNMP Trap with a description of Alarm state to defined IP address – more informations..
    • Email
      Apart from SNMP Trap, in a case of alarm the device can send you Email with a description of Alarm state – more informations..

>> Damocles – communication protocols.

Technical specifications of Damocles MINI

    digital input, digital output, digital I/O, binary I/O, Ethernet I/O, remote I/O, web relay

  • Ethernet: RJ 45 (10BASE-T – IEEE802.3)
  • 4x Digital inputs: prepared for direct contacts connecting
  • 2x Relay outputs: relay contacts NC and NO
  • Device configuration:
    • UDP Config – IP address configuration, etc.. – remotely functions over the network, but only on the local segment of the network,
    • Over HTTP – graphic Flash interface – ensured by access password and defined range of IP addresses.

Ethernet port
+ Interface RJ45 (10BASE-T) – 10 Mbit or 10/100 Mbit network compatible
+ Supported protocols IP: ARP, TCP/IP (HTTP, Modbus over TCP), UDP/IP (SNMP)
+ SNMP compatibility Ver:1.00 compatible, some parts of the ver 2.0 implemented
Digital inputs
+ 4x Digital Inputs Dry contact / Wet contact directly
+ Pulse counter Yes, 32 bits per DI
Digital outputs
+ 2x Relay contacts up to 5A/110V AC or 5A/24V DC
1x NC and 1x NO for every output
LED Status indicators
+ POWER Green – power OK
+ LINK & Activity Green – Ethernet connectivity
DIP SWITCH configuration
+ DIP1   Not used
+ DIP2   – Security ON   = Security mode – remote configuration disabled
OFF = Non-Security mode – remote configuration enabled
Physical parameters
+ Voltage requirements 12-24 V/ 600 mA DC- coaxial power connector (barrel), GND on the shield
+ Dimensions / Weight 35 x 102 x 77 [mm] (H x W x D ) / 500 g

Sample ordering

  • How long it takes to supply ordered samples?
    We keep the Damocles MINI units permanently on stock and supply them during 24 to 48 hours.
    If you confirm the order, we will send you an E-mail and inform you about approximate delivery date.
  • What kind of guarantee do you provide?
    Standard guarantee is 2 years, it´s possible extend it by contract.
  • Where I can find the prices of devices?
    You can ask our distributors or ask for price (by Email or form).
  • Where I can find the price of Damocles and accessories for my project?
    Send us email (see Contacts), or Demand form. Introduce more informations about your project, how many Damocles unities and which accessories do you need. Don´t fotget write us in which software data will be processed or what do you expect from the program. Write us where are you come from too. We can recommend you the installation company in your neigbourhood.
  • How you will deliver my order?
    We use a couple of delivery companies, for express delivery we use FedEx.

>> Ways of product ordering

>> Fulfill on-line order

Ordering numbers

OID Popis typu
600 289
Damocles MINI set (photo)
Recommended start set for the work with Damocles MINI:
  – Damocles model MINI [600 250]
  – EU Power adaptor [600080] (photo) (can be replaced by US or UK type)
  – manual, CD
600 250
Damocles MINI (photo)
600 339
Damocles MINI 48V (photo)
Damocles MINI powered from -48V DC telco standard.
Power supply galvanic isolated from Dry Contact Inputs and relay Outputs.

 Damocles accessories

Resource & Download

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