FAQ Regarding the OW-SERVER – EDS Support

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

The OW-SERVER-ENET-2, 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 https://owfs.org/index_php_page_ow-server-enet.html.)
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.
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).
How do I perform a factory reset on the OW-SERVER-ENET-2 and OW-SERVER-WiFi-2?
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.

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