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OW-SERVER: 1-Wire to Ethernet Server, Revision 2
Ethernet Version
OW-SERVER: 1-Wire to Ethernet Server, Revision 2
Item ID: OW-SERVER-2
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Network Connection
Include Power Supply
Price:
$99.95
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25-99 $89.96
100-999 $79.96
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• Ethernet and WiFi variations available
• Real-Time Graphing and Logging through Web Browsers.
• Searches for active devices every 2 seconds
• Firmware can be flash upgraded from remote.
• Manages concurrent client connections safely and reliably.
• Debugging functionality helps simplify software integration.
• 3 separate 1-Wire networks providing robust communication.
• Automatically provides smart strong-pull-up for 1-Wire sensors.
• Fast WiFi network configuration over micro USB.
• Reports the 1-Wire network connected to each device.
• Automatic short detection on 1-Wire networks.
• 1-Wire MicroLan capacity of 1000 feet of cable, 22 devices*.
• ESD Protection more than 27kV (IEC801-2 Reference Model.) on the 1-Wire bus.
• LED indicators for Ethernet link/activity, power, and 1-Wire activity.
• Easy Installation
• ABS enclosure.
• Low Cost.

The OW-SERVER is an inexpensive Ethernet/WiFi to 1-Wire interface that is designed to efficiently monitor and control 1-Wire devices. The OW-SERVER will allow you to use industry standard Ethernet or WiFi products (switches, hubs, etc.) to build the backbone of your 1-Wire based sensor / control system. This provides several important benefits: First, 1-Wire networks can be easily distributed over great distances without having to deal with the challenges associated with the installation of physically large 1-Wire networks. By distributing the 1-Wire networks, the individual 1-Wire MicroLans can be kept to a smaller physical size, thereby improving responsiveness/reliability and decreasing installation costs. Second, since the OW-SERVER communicates over standard Ethernet/WiFi, you can take advantage of existing corporate LANs, WLAN, the Internet, and in-house MIS expertise for building out and maintaining the backbone of your sensor network.

The OW-SERVER has been designed in such a way to minimize the amount of network resources needed to monitor 1-Wire devices. It maintains the latest readings of its 1-Wire devices which are updated every 2 seconds. This enables the OW-SERVER to deliver a current reading without waiting for a time intensive temperature conversion (or other conversion) to be performed. Also, the OW-SERVER is designed to push data when a user defined alarm occurs via SNMP traps. This significantly reduces the necessary polling rate for many applications while still supplying assurance that any problem will be detected in a timely manner.

A number of Ethernet protocols are used by the OW-SERVER including HTTP and SNMP. The HTTP interface provides a simple means to configure the OW-SERVER, 1-Wire sensors and collect real-time sensor data. The real-time data is presented in a number of ways including:

  • Overview Page - containing primary attributes (e.g. ROM Id, Device Type, Temperature Readings) of each sensor, a graph of all the sensors with the user selected value (e.g. Temperature, Humidity, Light Level, Latch State) and a "Download" button for exporting the graph's data in a CSV format.
  • Sensor Pages - includes all of the sensor's data, a graph of up to three user selected sensor values and a "Download" button for exporting the graph's data in a CSV format.
  • Advanced Details Page - contains all of the data from the connected sensors. AJAX techniques automatically updates the information insuring the data being displayed is current.

The SNMP interface is divided into 3 sections: edsEnterprise, owTrap and owDevices. The edsEnterprise section presents basic product information, such as name and version. The owTrap section is where you define the IP address the trap should be sent, the high alarm, low alarm, and the hysteresis. The owDevices section data similar to the Overview and Devices webpage.

The OW-SERVER is ideal for many applications which include:

  • Server Room Monitoring
  • SCADA Systems
  • HVAC
The OW-SERVER currently supports the following 1-Wire devices:
Embedded Data Systems Devices
• OW-ENV-TH - Temperature / Humidity Sensor with Optional Relay
• OW-ENV-THPL - Temperature / Humidity / Pressure / Light Sensor with Optional Relay
• OW-ENV-TL - Temperature / Light Sensor with Optional Relay
• OW-ENV-TP - Temperature / Pressure Sensor with Optional Relay
• OW-ENV-TR - Temperature Sensor with Relay
• OW-IO-AI4 - Quad Analog Input 4-20mA & 0-10V
• OW-IO-AI8 - Octal Analog Input 4-20mA & 0-10V
• OW-IO-DIO8 - Octal Discrete Input & Output
• OW-RTD4W - 1-Wire Interface for 4-Wire RTD with Optional Relay
• OW-TEMP-B3-12A - DS18B20 Temperature Probe with Optional RJ12 Plug
• OW-TEMP-BF-12 - Foil Tape DS18B20 Temperature Sensor with Optional RJ12 Plug
• OW-TEMP BW-12 - Wall Mount DS18B20 Temperature Sensor with Optional RJ12 Plug
• OW-TEMP-S3-12 - DS18S20 Temperature Probe with Optional RJ12 Plug
• OW-TEMP-SF-12 - Foil Tape DS18S20 Temperature with Optional RJ12 Plug
• OW-TEMP SW-12 - Wall Mount DS18S20 Temperature Sensor with Optional RJ12 Plug
• OW-VIB - Vibration Monitor with Optional Relay
Maxim Devices
• DS18B20 - 12 Bit Temperature Sensor
• DS18S20 - 9 Bit Temperature Sensor
• DS2406 - Dual Addressable Switch
• DS2408 - 8 Channel Addressable Switch
• DS2423 - 2 Channel Counter
• DS2438 - Battery Monitor with Temperature and A/D
• DS2450 - Quad A/D Converter
• DS28EA00 - Thermometer with Sequence Detect and PIO

* The number of supported devices was reduced to 23 with the release of firmware version 1.34.

1-Wire Connection

3 RJ12 Jacks

Communication

10/100 BASE-T Ethernet or 802.11b/WiFi
Network Protocols HTTP, HTTP Post, SNMP, SNMP Traps, TCP Socket, Multicast, DHCP
1-Wire Devices Up to 23 devices
Supply Voltage DC ±10% 5V
Rated Current (average) with Ethernet but no 1-Wire devices connected 245mA
Communication 10/100Base-T Ethernet
Enclosure Dimensions (L x W x H) 139.7 x 85.27 x 31.75mm
Weight 0.2kg
Operating Temperature -40 to 85°C
Storing Temperature -40 to 85°C
Operating Humidity (non-condensing) 0 to 90%RH
Storing Humidity (non-condensing) 0 to 90%RH
Supported Devices
DS18B20: Programmable Resolution 1-Wire Digital Thermometer
DS18S20: 1-Wire Digital Thermometer
DS2406: Dual Addressable Switch
DS2408: 8 Channel Addressable Switch
DS2423: 4kbit 1-Wire RAM with Counter
DS2438: Smart Battery Monitor
DS2450: Quad A/D Converter
DS28EA00 - Thermometer with Sequence Detect and PIO
OW-ENV-TH: Temperature / Humidity Sensor
OW-ENV-THR: Temperature / Humidity Sensor with Relay
OW-ENV-THPL: Temperature / Humidity / Pressure / Light Sensor
OW-ENV-THPLR: Temperature / Humidity / Pressure / Light Sensor with Relay
OW-ENV-TL: Temperature / Light Sensor
OW-ENV-TLR: Temperature / Light Sensor with Relay
OW-ENV-TP: Temperature / Pressure Sensor
OW-ENV-TPR: Temperature / Pressure Sensor with Relay
OW-ENV-TR: Temperature Sensor with Relay
OW-ENV-T: Temperature Sensor with Screw-Down Terminals
OW-IO-AI4 - Quad Analog Input 4-20mA & 0-10V
OW-IO-AI4-R - Quad Analog Input 4-20mA & 0-10V with Relay
OW-IO-AI8 - Octal Analog Input 4-20mA & 0-10V
OW-IO-AI8-R - Octal Analog Input 4-20mA & 0-10V with Relay
OW-IO-DIO8 - Octal Discrete Input & Output
OW-IO-DIO8-R - Octal Discrete Input & Output with Relay
OW-RTD4W: 1-Wire Interface for 4-Wire RTD
OW-RTD4W-R: 1-Wire Interface for 4-Wire RTD with Relay
OW-TEMP-B3-12A - DS18B20 Temperature Probe with Bare Leads
OW-TEMP-B3-12AR - DS18B20 Temperature Probe with RJ12 Plug
OW-TEMP-BF-12 - Foil Tape DS18B20 Temperature Sensor with Bare Leads
OW-TEMP-BF-12R - Foil Tape DS18B20 Temperature Sensor with RJ12 Plug
OW-TEMP BW-12 - Wall Mount DS18B20 Temperature Sensor with Bare Leads
OW-TEMP BW-12R - Wall Mount DS18B20 Temperature Sensor with RJ12 Plug
OW-TEMP-S3-12 - DS18S20 Temperature Probe with Bare Leads
OW-TEMP-S3-12R - DS18S20 Temperature Probe with RJ12 Plug
OW-TEMP-SF-12 - Foil Tape DS18S20 Temperature with Bare Leads
OW-TEMP-SF-12R - Foil Tape DS18S20 Temperature with RJ12 Plug
OW-TEMP SW-12 - Wall Mount DS18S20 Temperature Sensor with Bare Leads
OW-TEMP SW-12R - Wall Mount DS18S20 Temperature Sensor with RJ12 Plug
OW-VIB: Vibration Sensor
OW-VIB-R: Vibration Sensor with Relay
Applications & Sample Code:
Documentation:
  1. How many devices can I connect to an OW-SERVER?

    You can connect up to 22 1-Wire sensors and view the data with the XML file or the SNMP interface. The 22 sensors may be distributed among the three 1-Wire ports in any combination. Additional units can be connected and read using the “Low Level” TCP connection interface. (OWFS utilizes the low level interface.)

  2. How do I update my OW-SERVER’s firmware?

    The OW-SERVER-ENET-2, OW-SERVER-WiFi-2G, OW-SERVER-WiFi-2, and OW-SERVER-WiFi can be updated using the web browser interface following the steps below.

    1. Go to the firmware update webpage, http://10.0.10.43/protect/fwupload.htm (substitute the correct IP address).
    2. The OW-SERVER will prompt for the username (“admin”) and password (“eds” by default).
    3. Upload the new firmware (file extension = *.hex).
    4. Go to http://10.0.10.43/mpfsupload (substitute the correct IP address).
    5. Upload the new webpages (file extension = bin).
    6. Clear browser cache.

    The OW-SERVER-ENET firmware should be updated using Microsoft’s TFTP server. (Please note alternative updating directions using Linux can be found at http://owfs.org/index.php?page=enet-firmware.)

    1. Turn on the TFTP Client Window's feature (if you do not have it on).
    2. Using the Windows Command prompt, go to the directory you have the latest firmware (e.g. OW_Server_Firmware_Enet_TFTP_v2.14.hex.
    3. Then send the following command substitute the correct IP address and file name:
      • "tftp 192.168.1.25 put OW_Server_Firmware_Enet_TFTP_v2.14.hex".
    4. After about 5 seconds you will need to use a web browser to upload the new pages.
    5. Go to http://192.168.1.25/mpfsupload (substituting the correct IP address).
    6. Then select the bin file attached.
  3. How do I reset my password?

    You can reset the OW-SERVER’s password by performing a factory reset. (For further information see next question).

  4. How do I perform a factory reset on the OW-SERVER-ENET-2 and OW-SERVER-WiFi-2G?

    1. Remove power from the OW-SERVER-ENET-2/OW-SERVER-WiFi-2.
    2. Remove the lid of the OW-SERVER-ENET-2 by unscrewing the four corner screws.
    3. Once lid is removed, with connector panel positioned towards you, locate the two plated drill holes in the upper center of the PC board with the word “RESET” above them (P2). See photo below.
    4. Apply power to the OW-SERVER-ENET-2/OW-SERVER-WiFi-2.
    5. Using an appropriate tool (tweezers, paper clip, etc.) short these two pads together until the green LED stops flashing and stays on solidly.
    6. Remove the short and replace the top cover. Once you have removed the short from P2, the reset will take less than four seconds to complete.

  5. Why are the DS18B20 and/or DS18S20 temperature readings not updating?

    The underlining cause of the error is the VDD (power) pin not being connected to ground or 5V+. This will cause the DS18B20 (or DS18S20) to have a "power-on reset" occur during most temperature conversion attempts. The DS18B20's temperature register will read 85°C following the power-on reset. The OW-SERVER filters out the response as invalid which can lead to a DS18B20 (or DS18S20) not being updated regularly. If the OW-SERVER has never gotten a valid temperature reading from the DS18B20 (or DS18S20) it will be reporting 0.0°C.

    Typically, the easiest fix is to connect the VDD pin on the DS18B20 (or DS18S20) to the OW-SERVER's pin 6. This will supply +5V to the sensor and stop the "power-on reset" from occurring.

  6. Why is my DS2438 reporting an invalid humidity reading?

    There are a variety of DS2438 based humidity sensor designs. The OW-SERVER assumes the DS2438 follows AAG’s TAI8540D. Humidity readings from other DS2438 based sensors can be calculated using a combination of the VAD, VDD and/or VSense values. Please contact the sensor manufacturer for details.

Additional Categories Containing This Product
1-Wire > Interface Adapters > WiFi