905U-E Wireless Ethernet Modem FAQ

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Introduction to configuring the 905U-E radio Ethernet modem.

The 905U-E Wireless Ethernet modem provides wireless communications between Ethernet devices or Ethernet wired networks (LAN’s). It has an internal 900MHz spread spectrum frequency hopping wireless transceiver, which can be used without a radio license in many countries.

The 905U-E has a standard RJ45 Ethernet connection which will operate at up to 100Mbit/sec. The module will transmit the Ethernet messages on the wireless band at up to 200 Kbit/sec.

To use the 905U-E modem with the DT8x range of data loggers, use the 905U-E modem as an “Access Point” or “Client” modem.

Further information including the users manual for the 905U-E radio modem can be found on the Elpro website Elpro Radio modems.
Refer to the users manual for more detailed explanations of 905U-E commands and settings.

Access Point vs Client

The Access Point unit acts as the “wireless master” unit. The Access point sets up the wireless links to the Client units, and controls the wireless communications.

An Access Point can connect to multiple Clients. In this example, the Access Point should be the “central” unit.

Access Point multiple client.PNG

An Access Point could be used as a “Repeater” unit to connect two 905U-E Clients which do not have direct reliable radio paths.

Access Point Repeater.PNG

Configuration Examples

To configure the 905U-E modem use the built-in web server.

To access the configuration make an Ethernet connection from your PC to the modem. There are two methods of doing this.

  1. Adjusting the PC
    This requires the PC to be set to the same network as the default settings on the 905U-E, using the 905U-E web page.
    For further information refer to the manual.
  2. Adjusting the 905U-E
    This requires the 905U-E to be set on the same network as the PC, using a terminal package, such as DeTransfer or Hyperterminal.

As most installations will require the 905U-E modems to be connected to existing networks, following are the details of how to configure the 905U-E modem using terminal software.

Note : For your Gateway, Netmask and IP address settings, please consult your network administrator.

Access Point Configuration

Access Point Configuration.PNG

To adjust the 905U-E network settings using the serial port(assuming configuration PC is on existing network) follow these steps.

  1. Open terminal program with settings with data rate 19200bps, 8 data bits, 1 stop bit, no parity and no flow control.
  2. Set dipswitch to SETUP
  3. Connect "straight-through" serial cable to 905U-E and power up unit.
    This will be the PROMOD-6 cable supplied with the modem from Datataker.
  4. Power up the 905U-E. When prompted, strike the Enter key to abort automatic boot
  5. Set IP address of 905U-E to required IP address with command "bip". For example bip
  6. Set netmask of 905U-E to required netmask with command "bnm". For example bnm
  7. Set gateway address of 905U-E to required gateway with command "bgw". For example bgw
  8. Set dipswitch to RUN
  9. Reset 905U-E with reset command.
  10. Connect the 905U-E to the network with a "straight-through" network cable.
  11. Open configuration webpage with Internet Explorer at configured address. For this example:
  12. Enter "Quick Start", enter default username “user” and password “user” when prompted.
  13. Under "Operating Mode" select Access Point.
  14. IP address should be
  15. Enter a System Generator String. This allows the wireless system to differentiate from another system, and is used as an encryption key. It should be the same for the system.
    For further information, refer to the manual.
  16. Select the Radio Encryption method if required.
    For further information, refer to the manual.
  17. Save the changes.

Client 1 Configuration

Perform the same configuration steps as the Access Point configuration with the following differences:

  1. set IP address of 905U-E for the required IP address. For this example it will be
  2. set the Operating Mode to Client.

Ensure the same System Generator String is used and the same Radio Encryption method is selected.

Client 2 Configuration

As above, but use the required IP address. For this example:

Extending the range of a network with a Repeater hop

Repeater Configuration.PNG

Configure units as described above in the Configuration Example.
Place the Access Point at the remote intermediate repeater location.

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