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9. FAQ
• I lost the Device Certificate. What can I do?
Take an ETS project where it is contained and open the Project Certificates Report .
• I opened a new project in ETS and added the Device Certificate. But the download to the secure 01548 doesn´t work.
Either use Commissioning Password and Authentication Code from your former project or make a factory reset to set 01548´s tool key back to its FDSK .
• I lost the Device Certificate and the password for the project where it was contained. What can I do?
Make a factory reset and use the device from then on only unsecured .
• The firmware update finished successfully but the device doesn´t work.
To restart turn the power off and on again (dis-/reconnection of KNX TP line) .
• Is it Ok to connect and disconnect the Ethernet cable quickly?
No! Don’t do this . Before reconnection, wait for a few seconds .
• What shows the Programming LED if the Ethernet cable is not connected?
Similar to having no IP network available, the Programming LED is blinking red .
• What can be a transmission error when LED 2 Bus State KNX TP is lighting red?
For every telegram sent out on KNX TP, 01548 waits for an acknowledgement on the TP line . When the receiver was busy (BUSY) or received an incorrect telegram
(NACK) or 01548 didn´t receive a response (missing IACK), LED 2 is lighting red to show a transmission error exists on the line .
• LED 2 Bus State KNX TP is continuously blinking green. Why?
This indicates 01548 is waiting for his firmware file download . For more information and how to switch back to normal operation please see chapter 6 .5 .
• I disabled DHCP and assigned a correct IP configuration, but I cannot access the web front-end.
Reset the 01548 and try again . More information about changing the IP network configuration can be found in chapter 4 .5 .2 .
• I try to access the web front-end but I’m not successful. What can I do?
Make sure the web front-end is not deactivated and the URL bar entry matches the correct IP address together with the right HTTP port or use the MAC address in
exactly the way as explained (chapter 6 .2 .3) . Then refresh the browser and try again . Or check IP configuration via TP by ETS .
• Is it possible to reach the web front-end when the device is in boot mode?
Yes, it is . The web front-end is accessible (chapter 6 .5) . When boot mode is active, the web front-end looks like illustrated in Figure 12 . To exit boot mode the web front-
end Update tab must be used or, after 10 min, it will be switched off automatically .
• Is it possible to do a Factory Reset during the device is in boot mode?
No . LED 2 Bus State KNX TP will light up red when holding the Function button .
• How can I find out the actual IP address of my 01548?
In the web front-end, the Device Info tab shows the actual IP address .
When ETS can connect to 01548 via IP, the IP address is contained in the list of Discovered Interfaces .
In Windows, with a right click on the network device the properties window can be opened . MAC address, IP address, HTTP port, serial number and version of firmware
(application software version) can be found here .
• How can I reach the web front-end in case I don´t know IP address and MAC address?
When 01548 cannot be accessed via the device list in the Windows network explorer (after refreshing the window), the actual IP address must be found at first . Then use
Windows or the ETS like described in last question .
• When can it be necessary to send IACKs on sent out messages?
For example, when a visualization is part of the installation and this visualization is not configurable by ETS .
• I linked my IP router with an DSL router. Can I open a port on WAN side to connect to my installation from the Internet?
It should not be done to open a port at the WAN side . KNXnet/IP, even KNX IP Secure, is not designed for that . It is highly recommend using a VPN connection or mak-
ing use of an available web or KNX IoT solution .
FAQ