Users Manual IRTrans Version 2.12
9
If an external power supply is used, only GND / RxD / TxD are needed.
A power supply is needed for the IRTrans RS232 or Mediacontroller.
This power supply needs to deliver 8-16V DC with about 100mA. The
positive pole has to be connected to the inner contact of the power
connector (as usual).
2.5. Connecting the PowerOn Option
An IRTrans Module with PowerOn Option is shipped with a connecting
cable. This Cable can be connected to the Power Switch of the ATX PC.
To do that the cable is to be connected between the Power Switch and
the Main board.
In no case that Contact might be used to switch high current, high
voltage or even Mains!
The additional (isolated) Cable can be used to power the IRTrans with
+5V Standby Voltage. Then no external Power Supply is needed. To
allow that, the ATX Power supply has to deliver at least 1A on the
Standby Line. Unfortunately in most PCs that Voltage is not readily
available on a connector.
That means that a cable must be tapped. That should only be done
when you have the needed equipment (Measurment Tools) and
knowledge. Mistakes when connecting the Module (other Voltages
then 5V) might damage the IRTrans, Short-Cuts might damage the
PC / Power Supply or in the worst case might even cause Fires. To
avoid that, the system should always be protected by a Fuse in the
Cable.
Before making any connections the Mains Connector should always
be removed before making any connections because the Standby
Voltage is present even when the PC is switched off.
If there's any doubt an external Power Supply should be used.
The Software settings to use the PowerOn Options are done in the Status
Page of the GUI or ASCII Client. That is explained in Detail in Chapter 4.5
of this manual.
Users Manual IRTrans Version 2.12
10
2.6. Building a multizone system
The IRTrans System ist used to control larger homes, too. To do that up
to 16 IRTrans devices can be connected using the serial two wire bus.
Cables and infrastructure can be freely chosen, no special cables are
needed.
!
The serial bus has been tested with cables up to 30m long.
Depending on the environment larger distances are possible.
However, connecting devices in different buildings is not allowed
without a galvanic isolation of the two devices.
!
No special cables are needed. They do not have to be shielded
or twisted. Of course an existing TP wiring can be used.
!
The topology can be freely chosen. It is possible to use bus and
star topologies. Even combinations are allowed.
If a three wire bus is used, the supply voltage for all units can be
transferred over the bus, too. Any of the connected units can be used to
power the bus. The power supply has to deliver 8-16V= with about 50mA
for each connected module.
Please also read the general instructions for the IRTrans Bus in
Chapter 2.1.
