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Poseidon 3268: WEB thermometer & I/O with SNMP

Product replaced by a new generation Poseidon2 3268.

Ethernet temperature / humidity monitoring with 2 relay outputs and 4 dry contact inputs (Web, SNMP, and E-mail). Output relays can be controlled over the Web.

Poseidon model 3268 can notice operator of crisis situation in various method (switched on/switched off contact, temperature or humidity out of set range).

When a Alarm occurs, the device sends you Email and notice Your NMS (Network Management Software) over SNMP.

Configuration and current values over graphic WWW interface.

  • 2 relay outputs to control external devices
  • 4 inputs to connect contact
  • You can connect up to 5 temperature or humidity sensors.
  • Typical use:
    • Switch contact to send email or SNMP Trap to several recipients.
    • Turn on external cooling fan and notify an operator after temperature gets out of preset range
Ethernet temperature / humidity monitoring with 2 relay outputs and 4 dry contact inputs (Web, SNMP, and E-mail). Output relays can be controlled over the Web.

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Poseidon2 3268 comparison to previous generation

  Poseidon2 3268
Poseidon 3268
Housing Metal Plastic
Power input Jack + Terminal block Jack only
Power output
For powering a smoke detector or other external devices with relay outputs
2x terminal block
RJ11 connectors for connecting external sensors 2x 1x
External sensors (data points) that can be connected
Combined temperature + humidity sensor counts as 2 sensors.
8 5
Supported sensors 1-Wire
1-Wire UNI

All RJ11 sensors from HW group

Temperature & Humidity
sensors only
DI (Digital Inputs for Dry Contacts) 4 4
DO (Digital Outputs – low voltage NO/NC relay contacts) 2 2
Ethernet 10/100 Mbps 10 Mbps
Internal logger 250,000 records
SMS-GW client
For sending SMS alerts through a HWg-SMS-GW device without any software application
E-mail recipients 5 4
E-mail alert to values out of a defined SafeRange
Sending e-mail using SMTP TLS (e.g. gmail)
Periodic e-mail reports
E-mail alarm reminder
HWg-Push protocol (required for
SNMP protocol
Modbus/TCP protocol
Operating temperature range -35 to +85°C (-31 to +185°F) 0 to 65°C (32 to 149 °F)

Basis features

  • Ethernet: RJ45 (10BASE-T)
  • WEB: Embedded WEB server / GUI
  • Sensors: 1xRJ11 1-Wire (max 5 temperature / humidity sensors)
  • Inputs: 4 dry contact inputs (for detectors)
    (Smoke, power, water leak, door contact, air flow, entry to the room)
  • Outputs: 2 output relays (24 VDC)
    (Air conditioning, server power supply, horn / light tower)
  • M2M protocols: SNMP, XML
  • Sending SMS: With external software only
  • Physical features: dimensions: 102 x 76 x 36 [mm]
  • Response to thresholds: SNMP trap, E-mail
  • Built-in functions: Output controlled with an input or sensor value ("Thermostat" mode).
  • Support for programmers: HWg SDK
  • Supported software
    • HWg-PD Trigger: Controls other IP devices, redirects alarms to SMS
    • HWg-PDMS: Logging, export to MS Excel, reports
    • >> Third-party SNMP software
      (HP OpenView, IBM Tivoli, Nagios, Zabbix, Cacti, Monitor one, The Dude, Paessler IPCheck, Ipswitch WhatsUp, Axence nVision, CBR little:eye, LoriotPro, GFi NSM, SNMPc 7, CA NSM, ActiveXperts NM, Intellipool NM, MSC Operations Manager 2007)

>> Poseidon model XXXX - overview of models



Poseidon 3268: WEB thermometer & I/O with SNMP
  • IT – control: switch on/off or restart connected devices

  • Security: supervising of sensors in IT rooms.

  • SCADA systems: connecting of external inputs
  • Monitoring of back-up power source: UPS and Diesel engines
  • Monitoring of operating conditions: (temperature and humidity) ICT technologies (fire, security and phone systems)
  • Logging of processes: storages, cold-storage rooms, freezers and fridges (food industry and pharmacy)
  • IT – monitoring:  server rooms, 19“ racks (ICT)
  • Camera systems: external sensors connecting(door contact, PIR)
  • Large buildings: heating and air-condition optimalization
  • Systems interconnecting:  fire (EPS), security (EZS), access system
  • Air-condition monitoring: temperature and evaporated water leaking
  • Supervising systems: Information points, ATM, terminals

>> Poseidon - application examples

>> Application study - Poseidon family


Temperature, humidity, voltage, AC current, air flow, flood, electricity supply, water leak detector, door contact, air flow, entry to the room1-Wire sensors

  • Total bus length max 60 m
  • Each sensor has its own SafeRange. When the range is exceeded (alarm), e-mail or SNMP trap is invoked.


DI (Dry contact inputs) for detectors:

DO (Digital Outputs) Relay:

  • Power Detector / Control 110/230V AC: PowerEgg 

>> More sensors


Big image SNMP Traps


  • WEB (HTML)
    Values and state of sensors are presented on WWW page. The page is automatically reloaded every 5 second. There is a link to Flash Setup from main HTML page, update FirmWare and others
  • XML
    All sensor's values as well as alarm status information are available in XML files (values.xml) and any application can log it from XML tags - more information
  • SNMP
    SNMP is protocol for monitoring of telecommunication devices, network infrastructure and related technology. The Poseidon is fully controllable over SNMP (v1, partially v2) - more information

  • Alarms
    • SNMP Traps
      In case of exceeding "Safe Range" the sensor gets to Alarm status. To notify of this a SNMP Trap including alarm status description is sent to configured IP address - more information
    • Email
      In case of exceeding "Safe Range" the sensor gets to Alarm status. To notify of this a Email including alarm status description is sent to configured email address - more information

>> Poseidon – communication protocols

HW interface

Overview of all sensors in our assortment: Sensors and accessories.

  • Digital Outputs (Relay switch)
    2 switching contacts of internal relay (output contact can be used as a NO (Normally Open) or NC(Normally Close))
  • Digital Input (Dry Contact input)
    4x input to connect contact (door for example) or output from relay (pins labled as NO or NC)
  • 1-Wire Bus - RJ11
    A bus for use in IT, designed to connect temperature and humidity sensors over up to 10m

>> Interface for connecting sensors to Poseidon


Technical specification

Poseidon 3268: dry contact, snmp relay, digital thermostat, humidity controller, ip relay, hygrometer, racks room, environmental monitoring system
  • Port 1: Ethernet RJ 45 - 10BASE-T / 10 Mbit/s
  • Port 2: SENSORS - 1-Wire bus
  • Port 3: 4 Dry Contact input for contact connecting
  • Port 4: 2 switching outputs of internal relay
  • Power supply : 12V SS
  • Device setting:
    • UDP Config
    • Over WEB - graphic Flash setup interface
    • Over SNMP

Port 1 - Ethernet port  
+ Interface RJ45 (10BASE-T) – 10 Mbit or 10/100 Mbit network compatible
+ Supported protocols IP: ARP, TCP/IP (HTTP), UDP/IP (SNMP)
+ SNMP compatibility Ver:1.00 compatible, some parts of the ver 2.0 implemented
Port 2 - 1-Wire sensor bus  
+ Connector RJ12 (6 pins - 4 pins used only = RJ11 compatible)
+ Sensors / distance max. 60 m total lenght
Port 3 - Dry contact inputs  
+ 4 Contact inputs Connect it with a contact directly (dry contact).
+ Isolation Galvanic isolated up to 50V DC
+ Sensor type NO or NC contact switch
+ Max distance Up to 30 m
Port 4 - Relay switch outputs  
+ 2 Digital outputs Control via network (Web, XML, SNMP) or signal local alarm
+ Isolation Relay switch up to 50V DC, max DC current 24V/1A, 50V/0.5A
+ Switch type 3 pins, can be used as NO or NC contact switch
LED Status indicators
+ POWER Green - power OK
+ LINK & Activity Yellow - Ethernet connectivity
DIP SWITCH configuration
+ DIP1   - RS--232 Setup mode Not used
+ DIP2   - Security ON   = Security mode - remote configuration disabled
OFF = Non-Security mode - remote configuration enabled
Physical parameters  
+ Voltage requirements 9 - 15V / 250 mA DC
coaxial power connector (barrel), GND on the shield
+ Dimensions 102 x 76 x 36 [mm]
+ Weight 150 g


Which software to use

    HWg-PDMS: rack mount 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
  • Other applications: Third-party SNMP software
  • 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))


PD Trigger application example

With the PD Trigger application for Windows, it is possible to receive alarms (SNMP traps) from an unlimited number of Poseidon products and define conditions and actions based on the originating device and the probe name. For example:
  • In case of air conditioning failure in server room A, send a SMS to Peter
  • In case of alarm in server room B, send e-mail to Tom
  • In case of electricity supply failure anywhere, send SMS to Peter and turn on a warning light at the receptionist's desk

Poseidon 4002: rack mount environment monitoring, e-mail alerting, sms alerts

>> Software for the Poseidon family


Sample ordering

    Ask for the price or details:
     - Web:  http://
    Country: *

    Spam protection. How many is SIX times six?

  • How long it takes to supply ordered samples?
    We keep Poseidon 3268 units on stock and we supply samples them within 24 to 48 hours.We confirm time of delivery via email.
  • What guarantee you offer?
    Standard is 2 years, it can be extended after agreement..
  • Where do I get price?
    From our distributors, or by direct request the price (Email or Form).  
  • How to find out price of the Poseidon, sensors and accessories for my project?
    Email us (see Contacts) or use Demand form. Fill in number of sensors, individual distance and what values exactly you intend to measure. Do not forget to mention what SW you will use for data processing or what you expect from the program. Tell use where you are from, we may recommend you installation company in your surroundings
  • Can I pay by a payment card?
    Yes but not online. Fill in the online order form, print it out. Write your payment card detail, sign it and fax it to our fax number. The other possibility is to pay via bank transfer.
  • How do you supply the order?
    We use several transport companies and FedEx for express shipments.

>> How to order product

>> Fill in Online order form




OID Type description
600 254
Poseidon model 3268 (photo)
600 255
Poseidon 3268 Tset (photo)
Recommended Poseidon model 3268, power adapter, door contact, temperature probe (3m cable).

Accessories for Poseidon model 3268

  • Power adapter
  • Accessories for the 1-Wire bus (RJ11)
    • Poseidon T-Box  [600 040]
      Hub for up to 5 probes over 1-Wire bus (5x RJ11), connecting cable 0,1 meter long.
    • Poseidon T-Box2  [600 280]
      Hub for up to 2 probes over 1-Wire bus (2x RJ11), connecting cable 3 meter long.
    • Temp-1Wire (temperature probe)
    • Humid-1Wire (humidity probe)

  • Accessories for Inputs (Dry Contact)
    • Door contact (photo) [600 119]
      Magnetic sensor for door opening detection - small, easy to use..
    • PowerEgg
      Detection of external AC voltage (110 to 230V), configurable AC output(110 to 230V)
    • Flood detector (water leak detection with autonomous sirene)
    • Gas leak detector (Gas leak detection with autonomous sirene)
    • Smoke detector (Smoke and fire detection with autonomous sirene)
    • Motion detector
  • Accessories for Output (internal relays)
    • PowerEgg
      Detection of external AC voltage (110 to 230V), configurable AC output(110 to 230V)


Web relay, web enabled thermostat, SNMP I/O, web thermometer, MS Excel reporting
dry contact, snmp relay, digital thermostat, humidity controller, ip relay, hygrometer, racks room, environmental monitoring system, Nagios, Zenoss, Cacti, HP OpenView

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