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1 - RS485 Data line resistance check - ACU not responding or fails to be detected.
First power down any data line converters and disconnect any ACU’s that do not have a ashing OK LED. Using a Multimeter, measure
the resistance across the White/Green and Green pair at one end of the network. A resistance of between 60 and 80 ohms is required.
Repeat the test for the White/Orange and Orange pair. This is vital for a stable and trouble free installation.
2 - ACU Reset - No OK LED ashing.
The ACU has no factory reset condition as it does not contain any xed settings. The unit does have an operating program (rmware)
that controls its functions and can be conrmed as running by means of the ashing OK LED.
• If the OK LED is ashing steadily, then there should be no reason to reset the unit.
• If the OK LED is not ashing, you need to clear the unit so that it can receive a rmware download from the PC. Any other ACU’s
without OK LED’s must be taken o the line or powered down.
1. Stop Net2 Server (Net2 server icon - Bottom right of screen - Right mouse click, Select Stop the Net2 Server).
2. Power down the Net2 ACU.
3. Insert a link wire between the ‘Amber LED’ and ‘Media Detect’ terminals on reader 2 port.
4. Power up the ACU. - The OK LED ashes very quickly.
5. With the unit still powered, remove the link.
6. Go to the PC and Start the Net2 Server and go into the Doors screen. Click on the Detect button. This should look for the ACU
and then download its rmware (This may take up to 5 minutes). - The OK LED should now be ashing with a steady heartbeat. This
procedure must only be done for one ACU at a time.
NOTE: If this unit is using the TCP/IP interface, any xed IP settings will be retained. If the unit is in DHCP mode it will need to be detected
at each stage using the Server Cong Utility as a new address may be issued by the IP server, each time the PCB resets.
3 - Can we use a DHCP IP address?
The Ethernet interface does support DHCP, but for more reliable communication, a static IP address must be reserved for the unit. This is
because some servers issue dierent DHCP addresses each time they are restarted and this requires the Net2 interface to be manually
set up again - a time consuming process.
4 - TCP/IP - Direct PC connection.
Connect the network interface directly to the LAN port of the PC. Without the presence of a DHCP server the unit will default to an IP
address in the range 169.254.X.X.
Check the IP address of the network card of your PC by typing IPCONFIG at the command prompt. Detect theTCP/IP interface through
the Net2 Conguration Utility and change the IP address of the interface to an addresssimilar to that of your machine. For example, if
the IP address of the PC is 192.168.10.7, change the IP address of the TCP/IP interface to 192.168.10.8. Once the IP address of theinterface
has been changed into the range of the PC then Net2 will be able to communicate with it.
NOTE: Do not change the IP address of your PC to 169.254.x.x, this will not allow the IP address of the TCP/IP
interface to be xed correctly.
Technical help