How to rescue your network when all C-Bus clocks are turned off

If you ever make the mistake of turning off all your C-Bus clock generators, you will suddely find that you can't do ANYTHING any more. No scans, nothing.

There are two methods you can use to rescue your network.

Method 1 - Invoke Learn on a DIN Rail or Pro Series Output Unit.

1. Enter Learn by holding down one of the Override buttons for 10 seconds. Both indicators will start flashing on and off together and the Clock and Burden get turned on. Wait about 10 seconds and all other units enter Learn Mode. Network works normally from that point onwards.

2. To EXIT learn, hold down an Override button for 2 seconds.

Note: To avoid changing any unit programming when you exit Learn make sure all load indicators are off when you exit learn. This can be done by pressing the local override buttons.

Method 2 - PCI Clock

Only use this method if no Pro or DIN Rail Output unit is available.

1. Find which COM port your PC is connected to the C-Bus PCI with (eg COM3 in this example)

2. Start Hyperterminal.

3. Connect direct to the com port (COM3 in this example). Make sure you set the settings for the connection to 9600 bits/sec, 8 data bits, 1 stop bit, no parity.

4. Type ~ You should see this echo. If you do not, you have either the wrong COM port or the wrong port settings.

5. Type the special magic: A33E0001 and press return or enter

6. Your "C-Bus" indicators on your PCIs and other units should come back on, and your C-bus Clock is now recovered.

MAKE SURE that the special magic characters above are echoed when you type them. If they are echoed, but the C-Bus indicators do not come on, then turn the C-Bus power off and back on, then repeat steps 4 to 6.

7. Shut down Hyperterminal.

Once your Network is up and running you should make sure you have only between 1 & 3 clock generators enabled on a Network.

Obligatory legal disclaimer: No support. This method is provided as-is, with no guarantee that it will solve every problem in every instance. If you used this method and make typo's you may break things. If this method does not work, do not call Clipsal technical support.

 

Use the Learn method. That will sort out a burden for you.